C# Error CS1611 – The params parameter cannot be declared as {0}

C# Error

CS1611 – The params parameter cannot be declared as {0}

Reason for the Error & Solution

The params parameter cannot be declared as in ref or out

The keywords , or cannot be used with the keyword.

The following sample generates CS1611:

// CS1611.cs  
public class MyClass  
{  
   public static void Test(params ref int[] a)   // CS1611, remove ref  
   {  
   }  
  
   public static void Main()  
   {  
      Test(1);  
   }  
}