Extension Methods Discoverability : Extension Method « LINQ « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. LINQ
3. Extension Method

using System;

class Class1 {
}

class Class2 {
    public void Method1(string s) {
        Console.WriteLine("Class2.Method1");
    }
}

class Class3 {
    public void Method1(object o) {
        Console.WriteLine("Class3.Method1");
    }
}

class Class4 {
    public void Method1(int i) {
        Console.WriteLine("Class4.Method1");
    }
}

static class Extensions {
    static public void Method1(this object o, int i) {
        Console.WriteLine("Extensions.Method1");
    }

    static void Main() {
        new Class1().Method1(12); // Extensions.Method1 is called
        new Class2().Method1(12); // Extensions.Method1 is called
        new Class3().Method1(12); // Class3.Method1 is called
        new Class4().Method1(12); // Class4.Method1 is called
    }
}