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Compiler Error CS1673

Anonymous methods, lambda expressions, and query expressions inside structs cannot access instance members of 'this'. Consider copying 'this' to a local variable outside the anonymous method, lambda expression or query expression and using the local instead.

The following sample generates CS1673:

// CS1673.cs
delegate int MyDelegate();

public struct S
{
   int member;

   public int F(int i)
   {
       member = i;
       // Try assigning to a local variable
       // S s = this;
       MyDelegate d = delegate()
       {
          i = this.member;  // CS1673
          // And use the local variable instead of "this"
          // i =  s.member;
          return i;
           
       };
       return d();
   }
}

class CMain
{
   public static void Main()
   {
   }
}
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