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Compiler Error CS0149

Updated: June 2010

Method name expected

When creating a delegate, you must specify a method that matches the signature of the delegate. For more information, see How to: Declare, Instantiate, and Use a Delegate (C# Programming Guide).

The following sample generates CS0149:

using System;

namespace CompilerError0149
{
    // MyDelegate's signature specifies a single integer parameter
    // and returns a string.
    delegate string MyDelegate(int i);

    class MyClass
    {
        // Declare a field of the defined delegate type.
        static MyDelegate dt;

        public static void Main()
        {
            // The following delegate syntax requires an appropriate method
            // for the argument, not a number. 
            dt = new MyDelegate(17.45);   // CS0149

            // Try the following line instead. This time the argument is a
            // method that has a signature that matches the delegate.
            //dt = new MyDelegate(ExampleFunction);

            // The delegate can be sent as an argument to another method.
            AnotherMethod(dt);

            // Or it can be called directly.
            dt(10);
        }

        // ExampleMethod has an integer parameter and returns a string.
        public static string ExampleMethod(int j)
        {
            Console.Write("ExampleMethod, j = ");
            Console.WriteLine(j);
            return j.ToString();
        }

        public static void AnotherMethod(MyDelegate myDel)
        {
            myDel(8);
        }
    }
}

Date

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Reason

June 2010

Expanded the example.

Customer feedback.

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