[http-client-csharp] Remove incorrect casting for unknown discriminated subtype models (#4963)

fixes: https://github.com/microsoft/typespec/issues/4958

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/MrwSerializationTypeDefinition.cs

@@ -379,11 +379,22 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         /// </summary>
         internal MethodProvider BuildJsonModelCreateMethod()
         {
+            ValueExpression createCoreInvocation = This.Invoke(JsonModelCreateCoreMethodName, [_utf8JsonReaderParameter, _serializationOptionsParameter]);
+            var createCoreReturnType = _model.Type.RootType;
+
+            // If the return type of the create core method is not the same as the interface type, cast it to the interface type since
+            // the Core methods will always return the root type of the model. The interface type will be the model type unless the model
+            // is an unknown discriminated model.
+            if (createCoreReturnType != _jsonModelTInterface.Arguments[0])
+            {
+                createCoreInvocation = createCoreInvocation.CastTo(_model.Type);
+            }
+
             // T IJsonModel<T>.Create(ref Utf8JsonReader reader, ModelReaderWriterOptions options) => JsonModelCreateCore(ref reader, options);
             return new MethodProvider
             (
                 new MethodSignature(nameof(IJsonModel<object>.Create), null, MethodSignatureModifiers.None, _jsonModelTInterface.Arguments[0], null, [_utf8JsonReaderParameter, _serializationOptionsParameter], ExplicitInterface: _jsonModelTInterface),
-                This.Invoke(JsonModelCreateCoreMethodName, [_utf8JsonReaderParameter, _serializationOptionsParameter]).CastTo(_model.Type),
+                createCoreInvocation,
                 this
             );
         }
@@ -514,11 +525,21 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         internal MethodProvider BuildPersistableModelCreateMethod()
         {
             ParameterProvider dataParameter = new("data", $"The data to parse.", typeof(BinaryData));
+            ValueExpression createCoreInvocation = This.Invoke(PersistableModelCreateCoreMethodName, [dataParameter, _serializationOptionsParameter]);
+            var createCoreReturnType = _model.Type.RootType;
+
+            // If the return type of the create core method is not the same as the interface type, cast it to the interface type since
+            // the Core methods will always return the root type of the model. The interface type will be the model type unless the model
+            // is an unknown discriminated model.
+            if (createCoreReturnType != _persistableModelTInterface.Arguments[0])
+            {
+                createCoreInvocation = createCoreInvocation.CastTo(_model.Type);
+            }
             // IPersistableModel<T>.Create(BinaryData data, ModelReaderWriterOptions options) => PersistableModelCreateCore(data, options);
             return new MethodProvider
             (
                 new MethodSignature(nameof(IPersistableModel<object>.Create), null, MethodSignatureModifiers.None, _persistableModelTInterface.Arguments[0], null, [dataParameter, _serializationOptionsParameter], ExplicitInterface: _persistableModelTInterface),
-                This.Invoke(PersistableModelCreateCoreMethodName, [dataParameter, _serializationOptionsParameter]).CastTo(_model.Type),
+                createCoreInvocation,
                 this
             );
         }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/DiscriminatorTests.cs

@@ -4,6 +4,7 @@
 using System.ClientModel.Primitives;
 using System.Collections.Generic;
 using System.Linq;
+using Microsoft.Generator.CSharp.ClientModel.Providers;
 using Microsoft.Generator.CSharp.Input;
 using Microsoft.Generator.CSharp.Primitives;
 using Microsoft.Generator.CSharp.Providers;
@@ -200,5 +201,58 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.MrwSerializatio
             Assert.IsTrue(deserializationMethod?.BodyStatements!.ToDisplayString().Contains(
                 $"if (element.TryGetProperty(\"foo\"u8, out global::System.Text.Json.JsonElement discriminator))"));
         }
+
+        [Test]
+        public void TestBuildJsonModelCreateMethodProperlyCastsForDiscriminatedType()
+        {
+            MockHelpers.LoadMockPlugin(inputModels: () => [_baseModel, _catModel]);
+            var outputLibrary = ClientModelPlugin.Instance.OutputLibrary;
+            var model = outputLibrary.TypeProviders.OfType<ModelProvider>().FirstOrDefault(t => t.Name == "Cat");
+            Assert.IsNotNull(model);
+
+            var serialization = model!.SerializationProviders.FirstOrDefault() as MrwSerializationTypeDefinition;
+            Assert.IsNotNull(serialization);
+            var method = serialization!.Methods.FirstOrDefault(m => m.Signature.Name == "Create" && m.Signature.ExplicitInterface?.Name == "IJsonModel");
+
+            Assert.IsNotNull(method);
+
+            var expectedJsonInterface = new CSharpType(typeof(IJsonModel<>), model!.Type);
+            var methodSignature = method?.Signature;
+            Assert.IsNotNull(methodSignature);
+
+            var expectedReturnType = expectedJsonInterface.Arguments[0];
+            Assert.AreEqual(expectedReturnType, methodSignature?.ReturnType);
+
+            var invocationExpression = method!.BodyExpression;
+            Assert.IsNotNull(invocationExpression);
+            Assert.AreEqual(
+                "((global::Sample.Models.Cat)this.JsonModelCreateCore(ref reader, options))",
+                invocationExpression!.ToDisplayString());
+        }
+
+        [Test]
+        public void TestBuildJsonModelCreateMethodProperlyDoesNotCastForUnknown()
+        {
+            MockHelpers.LoadMockPlugin(inputModels: () => [_baseModel, _catModel]);
+            var outputLibrary = ClientModelPlugin.Instance.OutputLibrary;
+            var model = outputLibrary.TypeProviders.OfType<ModelProvider>().FirstOrDefault(t => t.Name == "UnknownPet");
+            Assert.IsNotNull(model);
+
+            var serialization = model!.SerializationProviders.FirstOrDefault() as MrwSerializationTypeDefinition;
+            Assert.IsNotNull(serialization);
+            var method = serialization!.Methods.FirstOrDefault(m => m.Signature.Name == "Create" && m.Signature.ExplicitInterface?.Name == "IJsonModel");
+
+            Assert.IsNotNull(method);
+
+            var methodSignature = method?.Signature;
+            Assert.IsNotNull(methodSignature);
+            Assert.AreEqual("Pet", methodSignature?.ReturnType!.Name);
+
+            var invocationExpression = method!.BodyExpression;
+            Assert.IsNotNull(invocationExpression);
+            Assert.AreEqual(
+                "this.JsonModelCreateCore(ref reader, options)",
+                invocationExpression!.ToDisplayString());
+        }
     }
 }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/MrwSerializationTypeDefinitionTests.cs

@@ -152,6 +152,10 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.MrwSerializatio
             Assert.AreEqual(2, methodSignature?.Parameters.Count);
             var expectedReturnType = expectedJsonInterface.Arguments[0];
             Assert.AreEqual(expectedReturnType, methodSignature?.ReturnType);
+
+            var invocationExpression = method!.BodyExpression;
+            Assert.IsNotNull(invocationExpression);
+            Assert.AreEqual("this.JsonModelCreateCore(ref reader, options)", invocationExpression!.ToDisplayString());
         }
 
         // This test validates the json model serialization create core method is built correctly
@@ -353,13 +357,9 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.MrwSerializatio
             // Validate body
             var methodBody = method?.BodyStatements;
             Assert.IsNull(methodBody);
-            var bodyExpression = method?.BodyExpression as CastExpression;
+            var bodyExpression = method?.BodyExpression;
             Assert.IsNotNull(bodyExpression);
-            var invocationExpression = bodyExpression?.Inner as InvokeMethodExpression;
-            Assert.IsNotNull(invocationExpression);
-            Assert.AreEqual("PersistableModelCreateCore", invocationExpression?.MethodName);
-            Assert.IsNotNull(invocationExpression?.InstanceReference);
-            Assert.AreEqual(2, invocationExpression?.Arguments.Count);
+            Assert.AreEqual("this.PersistableModelCreateCore(data, options)", bodyExpression!.ToDisplayString());
         }
 
         // This test validates the persistable model serialization create core method is built correctly

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/ModelCustomizationTests/CanCustomizeEnumToFieldFrameworkType.cs

@@ -52,7 +52,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -109,7 +109,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/ModelCustomizationTests/CanCustomizeEnumToFrameworkType.cs

@@ -52,7 +52,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -109,7 +109,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/ModelCustomizationTests/CanCustomizeFixedEnumString.cs

@@ -49,7 +49,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -106,7 +106,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/ModelCustomizationTests/CanCustomizeNullableStringToFixedEnum.cs

@@ -56,7 +56,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -113,7 +113,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/ModelCustomizationTests/CanCustomizePropertyIntoReadOnlyMemory.cs

@@ -54,7 +54,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -118,7 +118,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/ModelCustomizationTests/CanCustomizeStringToFixedEnum.cs

@@ -49,7 +49,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -106,7 +106,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/ModelCustomizationTests/CanCustomizeUriProperty.cs

@@ -52,7 +52,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -109,7 +109,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanChangeDictionaryToBinaryData.cs

@@ -59,7 +59,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -116,7 +116,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanChangeListOfEnumPropToListOfExtensibleEnum.cs

@@ -57,7 +57,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.Model global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.Model>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.Model)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.Model global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.Model>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -119,7 +119,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.Model global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.Model>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.Model)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.Model global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.Model>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanChangePropertyName.cs

@@ -62,7 +62,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.Model global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.Model>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.Model)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.Model global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.Model>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -131,7 +131,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.Model global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.Model>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.Model)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.Model global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.Model>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanChangePropertyNameAndRedefineOriginal.cs

@@ -62,7 +62,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -131,7 +131,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanChangePropertySerializedName.cs

@@ -62,7 +62,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -127,7 +127,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanCustomizeExtensibleEnum(int32).cs

@@ -49,7 +49,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -106,7 +106,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanCustomizeExtensibleEnum(string).cs

@@ -49,7 +49,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -106,7 +106,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanCustomizeLiteralExtensibleEnum(int32,1).cs

@@ -49,7 +49,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -106,7 +106,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanCustomizeLiteralExtensibleEnum(string,foo).cs

@@ -49,7 +49,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -106,7 +106,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanCustomizePropertyUsingField.cs

@@ -52,7 +52,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -105,7 +105,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanCustomizeSerializationMethod.cs

@@ -64,7 +64,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -123,7 +123,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanCustomizeSerializationMethodForRenamedProperty.cs

@@ -64,7 +64,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -123,7 +123,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanReplaceDeserializationMethod.cs

@@ -63,7 +63,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -93,7 +93,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/CanReplaceSerializationMethod.cs

@@ -21,7 +21,7 @@ namespace Sample.Models
             writer.WriteEndObject();
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.MockInputModel>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -85,7 +85,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.MockInputModel)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.MockInputModel global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.MockInputModel>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/MrwSerializationTypeDefinitions/TestData/SerializationCustomizationTests/ReadOnlyMemPropertyType.cs

@@ -64,7 +64,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.Model global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.Model>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.Model)this.JsonModelCreateCore(ref reader, options));
+        global::Sample.Models.Model global::System.ClientModel.Primitives.IJsonModel<global::Sample.Models.Model>.Create(ref global::System.Text.Json.Utf8JsonReader reader, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.JsonModelCreateCore(ref reader, options);
 
         /// <param name="reader"> The JSON reader. </param>
         /// <param name="options"> The client options for reading and writing models. </param>
@@ -145,7 +145,7 @@ namespace Sample.Models
             }
         }
 
-        global::Sample.Models.Model global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.Model>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => ((global::Sample.Models.Model)this.PersistableModelCreateCore(data, options));
+        global::Sample.Models.Model global::System.ClientModel.Primitives.IPersistableModel<global::Sample.Models.Model>.Create(global::System.BinaryData data, global::System.ClientModel.Primitives.ModelReaderWriterOptions options) => this.PersistableModelCreateCore(data, options);
 
         /// <param name="data"> The data to parse. </param>
         /// <param name="options"> The client options for reading and writing models. </param>