Delegate Call Back

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This is one of the code snippet I am trying to do for delegate callback

  public delegate void FooCallbackType(int a, int b, int c);

    class CMyClass
    {
        public void FunctionToCall(int a, int b, int c)
        {
            MessageBox.Show("I am first class");
            // This is the callback
        }


        public void Foo()
        {
            FooCallbackType myDelegate = new FooCallbackType(this.FunctionToCall);
            // Now you can pass that to the function
            // that needs to call you back.
        }


    }

    class CMyClassWithStaticCallback
    {

        public static void StaticFunctionToCall(int a, int b, int c)
        {
            MessageBox.Show("I am second class"); // This is the callback
        }


        public static void Foo()
        {

            FooCallbackType myDelegate = new FooCallbackType(CMyClass.StaticFunctionToCall);

        }

        static void Main()
        {




        }
    }

</pre>

1.In this example this line of code is showing error

FooCallbackType myDelegate = new FooCallbackType(CMyClass.StaticFunctionToCall);

because I think this function is belong to the Class "CMyClassWithStaticCallback not the "CMyClass"

so I don't understand why/how it is "CMyClass.StaticFunctionToCall"

2.What should I write in the Main section.

because I want to see the output to understand and comapre the result.

any help will be appreciated.

Posted 3-Feb-11 18:21pm

Christy A C

Updated 3-Feb-11 18:23pm

Rajesh Anuhya

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-02-03T18:34:00

This is what it is: you did not provide method called CMyClassWithStaticCallback.

Forget it, it does not matter! Your syntax is so obsolete! Consider this:

C#

//anonymous method, good for C# v.2 and above:
FooCallbackType myDelegate = delegate(int a, int b, int c) {
    //body of your delegate code here...
};

//same thing with lambda syntax, good with C# v > 2:
myDelegate = new FooCallbackType((int a, int b, int c) => {
    //body of your delegate code here...
});

Also, your Main may not compile you have another Main. This is because this is used as an entry point, most likely. To change the entry point, see you project's Property, Application tab, "Startup object".

—SA