C# Error CS0446 – Foreach cannot operate on a ‘Method or Delegate’

C# Compiler Error

CS0446 – Foreach cannot operate on a ‘Method or Delegate’. Did you intend to invoke the ‘Method or Delegate’?

Reason for the Error

You’ll get this error in your C# code when you are using the foreach statement and you use the method name without parentheses instead of a collection class.

For example, let’s try to compile the below C# code snippet.

using System;
namespace DeveloperPublishNamespace
{
    class Program
    {      
        static void Main(string[] args)
        {
            int[] array1 = new int[10];
            // Results with the CS0446  
            foreach (int i in Test) 
            { 
            }
            Console.WriteLine("No Error");
        }
        static void Test()
        {

        }
    }
}

You’ll receive the error code CS0446 when you build the above C# code because you are using the method name “Test” without parentheses instead of using the array “array1”.

Error CS0446 Foreach cannot operate on a ‘method group’. Did you intend to invoke the ‘method group’? DeveloperPublish C:\Users\Senthil\source\repos\ConsoleApp4\ConsoleApp4\Program.cs 10 Active

Solution

You can fix this error in your C# program by ensuring that you use a collection instead of a method with out parentheses. If you intend to use a function, ensure that the function returns a collection instead of void.

using System;
namespace DeveloperPublishNamespace
{
    class Program
    {      
        static void Main(string[] args)
        {
            int[] array1 = new int[10];

            // No Error now
            foreach (int i in Test()) 
            { 
            }
            Console.WriteLine("No Error");
        }
        static int[] Test()
        {
            return new int[10];
        }
    }
}