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Compiler Error CS0202

foreach requires that the return type 'type' of 'type.GetEnumerator()' must have a suitable public MoveNext method and public Current property

A GetEnumerator function, used to enable the use of foreach statements, cannot return a pointer or array; it must return an instance of a class that is able to act as an enumerator. The proper requirements to serve as an enumerator include a public Current property and a public MoveNext method.

Note

In C# 2.0, the compiler will automatically generate Current and MoveNext for you. For more information, see the code example in Generic Interfaces.

The following sample generates CS0202:

// CS0202.cs  
  
public class C1  
{  
   public int Current  
   {  
      get  
      {  
         return 0;  
      }  
   }  
  
   public bool MoveNext ()  
   {  
      return false;  
   }  
  
   public static implicit operator C1 (int c1)  
   {  
      return 0;  
   }  
}  
  
public class C2  
{  
   public int Current  
   {  
      get  
      {  
         return 0;  
      }  
   }  
  
   public bool MoveNext ()  
   {  
      return false;  
   }  
  
   public C1[] GetEnumerator ()  
   // try the following line instead  
   // public C1 GetEnumerator ()  
   {  
      return null;  
   }  
}  
  
public class MainClass  
{  
   public static void Main ()  
   {  
      C2 c2 = new C2();  
  
      foreach (C1 x in c2)   // CS0202  
      {  
         System.Console.WriteLine(x.Current);  
      }  
   }  
}