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Compiler Error CS0646 

Error Message

Cannot specify the DefaultMember attribute on a type containing an indexer

If a class or other type specifies System.Reflection.DefaultMemberAttribute, it cannot contain an indexer. For more information, see Properties.

The following sample generates CS0646:

// CS0646.cs
// compile with: /target:library
[System.Reflection.DefaultMemberAttribute("x")]   // CS0646
class MyClass
{
   public int this[int index]   // an indexer
   {
      get
      {
         return 0;
      }
   }

   public int x = 0;
}

// OK
[System.Reflection.DefaultMemberAttribute("x")]
class MyClass2
{
   public int prop
   {
      get
      {
         return 0;
      }
   }

   public int x = 0;
}

class MyClass3
{
   public int this[int index]   // an indexer
   {
      get
      {
         return 0;
      }
   }

   public int x = 0;
}

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