Compiler Error CS0466

'method1' should not have a params parameter since 'method2' does not

You cannot use params parameter on a class member if the implemented interface doesn't use it.

Example

The following sample generates CS0466.

// CS0466.cs  
interface I  
{  
   void F1(params int[] a);  
   void F2(int[] a);  
}  

class C : I  
{  
   void I.F1(params int[] a) {}  
   void I.F2(params int[] a) {}   // CS0466  
   void I.F2(int[] a) {}   // OK  

   public static void Main()  
   {  
      I i = (I) new C();  

      i.F1(new int[] {1, 2} );  
      i.F2(new int[] {1, 2} );  
   }  
}