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Questionc# extension methods syntax question Pin
Jon Joeney30-Jan-14 23:23
MemberJon Joeney30-Jan-14 23:23 
Hi, I have a syntax question on extension method syntax.

Here is my most simple extension method code

C#
using System;
using ConsoleApplication1;

namespace extensionTestNamespace.test.com
{
    public static class ExtensionTest
    {
        public static String AAAAAAA<T>(this T x) where T : TestClass1
        {
            return "Extension Method Test";
        }
    }
}


and here is the code that uses it

C#
using System;
using extensionTestNamespace.test.com;

namespace ConsoleApplication1
{
    public class TestClass1 { }
    public class TestClass2 { }
    public class TestClass3 { }


    class Program
    {
        private void run()
        {
            TestClass1 test1 = new TestClass1();
            TestClass2 test2 = new TestClass2();
            TestClass3 test3 = new TestClass3();

            //this works and I want it to work
            Console.WriteLine(test1.AAAAAAA());

            //this line won't compile, doesn't work, and
            //I want to add the same extension method 
            //to TestClass2 and don't know how
            Console.WriteLine(test2.AAAAAAA());     

            //this line won't compile either, but I
            //specifically don't want to add
            //the extension method to TestClass3
            Console.WriteLine(test3.AAAAAAA());     
        }


        static void Main(string[] args)
        {
            Program program = new Program();
            program.run();
        }
    }
}


My question is the syntax to allow the extension method AAAAAAA to test1 and test2 but not to test3. I had wanted to write this code

public static String AAAAAAA<T>(this T x) 
    where T : TestClass1
    where T : TestClass2


but it won't compile.

What I do not want to do is add a special extension method for each class type. What I do want is a single extension class but the where clause constraint has TestClass1 and TestClass2 but not TestClass3.

I don't know how to do it. Can it be done and if so I would appreciate help on the C# syntax.

Thank you
AnswerRe: c# extension methods syntax question Pin
harold aptroot31-Jan-14 0:05
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QuestionConsole Application c# & use shape & color Pin
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