Fix endpoint handling (#4164)

packages/http-client-csharp/emitter/src/lib/client-model-builder.ts

@@ -19,6 +19,7 @@ import { InputOperationParameterKind } from "../type/input-operation-parameter-k
 import { InputParameter } from "../type/input-parameter.js";
 import { InputEnumType, InputModelType, InputType } from "../type/input-type.js";
 import { RequestLocation } from "../type/request-location.js";
+import { fromSdkType } from "./converter.js";
 import { Logger } from "./logger.js";
 import { navigateModels } from "./model.js";
 import { fromSdkServiceMethod, getParameterDefaultValue } from "./operation-converter.js";
@@ -153,11 +154,7 @@ export function createModel(sdkContext: SdkContext<NetEmitterOptions>): CodeMode
             Name: "url",
             CrossLanguageDefinitionId: "TypeSpec.url",
           }
-        : {
-            Kind: "string",
-            Name: "string",
-            CrossLanguageDefinitionId: "TypeSpec.string",
-          };
+        : fromSdkType(parameter.type, sdkContext, modelMap, enumMap); // TODO: consolidate with converter.fromSdkEndpointType
       parameters.push({
         Name: parameter.name,
         NameInRequest: parameter.serializedName,

packages/http-client-csharp/emitter/src/lib/converter.ts

@@ -53,6 +53,7 @@ export function fromSdkType(
     } as InputNullableType;
   }
   if (sdkType.kind === "model") return fromSdkModelType(sdkType, context, models, enums);
+  if (sdkType.kind === "endpoint") return fromSdkEndpointType();
   if (sdkType.kind === "enum") return fromSdkEnumType(sdkType, context, enums);
   if (sdkType.kind === "enumvalue")
     return fromSdkEnumValueTypeToConstantType(sdkType, context, enums, literalTypeContext);
@@ -68,7 +69,6 @@ export function fromSdkType(
   // TODO -- endpoint and credential are handled separately in emitter, since we have specific locations for them in input model.
   // We can handle unify the way we handle them in the future, probably by chaning the input model schema and do the conversion in generator.
   if (sdkType.kind === "credential") throw new Error("Credential type is not supported yet.");
-  if (sdkType.kind === "endpoint") throw new Error("Endpoint type is not supported yet.");
 
   return fromSdkBuiltInType(sdkType);
 }
@@ -381,3 +381,11 @@ function fromSdkArrayType(
     CrossLanguageDefinitionId: arrayType.crossLanguageDefinitionId,
   };
 }
+
+function fromSdkEndpointType(): InputPrimitiveType {
+  return {
+    Kind: "string",
+    Name: "string",
+    CrossLanguageDefinitionId: "TypeSpec.string",
+  };
+}