Also fixed bug with indexer-property for `StandartResolver`.

sandbox/SharedData/Class1.cs

@@ -785,6 +785,26 @@ namespace SharedData
         [Key(0)]
         public string OPQ { get; set; }
     }
+    
+    [MessagePackObject]
+    public class WithIndexer
+    {
+        [Key(0)]
+        public int Data1 { get; set; }
+        
+        [Key(1)]
+        public string Data2 { get; set; }
+
+        [Key(2)]
+        public int this[int i] { get { return 0; } }
+    }
+    
+    public class WithIndexerContractless
+    {
+        public int Data1 { get; set; }
+        public string Data2 { get; set; }
+        public int this[int i] { get { return 0; } }
+    }
 }
 
 namespace Abcdefg.Efcdigjl.Ateatatea.Hgfagfafgad

src/MessagePack/Resolvers/DynamicObjectResolver.cs

@@ -1295,6 +1295,7 @@ typeof(int), typeof(int) });
                 {
                     if (item.GetCustomAttribute<IgnoreMemberAttribute>(true) != null) continue;
                     if (item.GetCustomAttribute<IgnoreDataMemberAttribute>(true) != null) continue;
+                    if (item.IsIndexer()) continue;
 
                     var member = new EmittableMember
                     {

tests/MessagePack.Tests/ContractlessStandardResolverTest.cs

@@ -76,14 +76,6 @@ namespace MessagePack.Tests
             public int OAFADFZEWFSDFSDFKSLJFWEFNWOZFUSEWWEFWEWFFFFFFFFFFFFFFZFEWBFOWUEGWHOUDGSOGUDSZNOFRWEUFWGOWHOGHWOG000000000000000000000000000000000000000HOGZ { get; set; }
         }
 
-        public class HasIndexer
-        {
-            public int Data1 { get; set; }
-            public string Data2 { get; set; }
-
-            public int this[int i] { get { return 0; } }
-        }
-
         [Fact]
         public void SimpleTest()
         {
@@ -194,19 +186,5 @@ namespace MessagePack.Tests
 
             v.IsStructuralEqual(o);
         }
-
-        [Fact]
-        public void IndexerCheck()
-        {
-            var o = new HasIndexer
-            {
-                Data1 = 15,
-                Data2 = "15"
-            };
-            var bin = MessagePack.MessagePackSerializer.Serialize(o, MessagePack.Resolvers.ContractlessStandardResolver.Instance);
-            var v = MessagePackSerializer.Deserialize<HasIndexer>(bin, MessagePack.Resolvers.ContractlessStandardResolver.Instance);
-
-            v.IsStructuralEqual(o);
-        }
     }
 }

tests/MessagePack.Tests/ObjectResolverTest.cs

@@ -336,5 +336,33 @@ namespace MessagePack.Tests
                 re.MyProperty.Is(1000);
             }
         }
+        
+        [Fact]
+        public void WithIndexer()
+        {
+            var o = new WithIndexer
+            {
+                Data1 = 15,
+                Data2 = "15"
+            };
+            var bin = MessagePack.MessagePackSerializer.Serialize(o, MessagePack.Resolvers.StandardResolver.Instance);
+            var v = MessagePackSerializer.Deserialize<WithIndexer>(bin, MessagePack.Resolvers.StandardResolver.Instance);
+
+            v.IsStructuralEqual(o);
+        }
+        
+        [Fact]
+        public void WithIndexerContractless()
+        {
+            var o = new WithIndexerContractless
+            {
+                Data1 = 15,
+                Data2 = "15"
+            };
+            var bin = MessagePack.MessagePackSerializer.Serialize(o, MessagePack.Resolvers.ContractlessStandardResolver.Instance);
+            var v = MessagePackSerializer.Deserialize<WithIndexerContractless>(bin, MessagePack.Resolvers.ContractlessStandardResolver.Instance);
+
+            v.IsStructuralEqual(o);
+        }
     }
 }