Why does C# compiler overload resolution algorithm treat static and instance members with equal signature as equal?

问题

Let we have two members equal by signature, but one is static and another - is not:

class Foo
{
    public void Test() { Console.WriteLine("instance"); }

    public static void Test() { Console.WriteLine("static"); }
}

but such code generate brings a compiler error:

Type 'Foo' already defines a member called 'Test' with the same parameter types

But why?

Let we compiled that successfully, then:

• Foo.Test() should output "static"

• new Foo().Test();should output "instance"

Can't call the static member instead of instance one because in this case another, more reasonable compiler error will occur:

Member 'Foo.Test()' cannot be accessed with an instance reference; qualify it with a type name instead

回答1:

What about, from an instance method:

Test();

What would that call? You'd probably want to give the instance method "priority" over the static method, but both would be applicable.

I would say that even if it were allowed, it would be a fundamentally bad idea to do this from a readability point of view... for example, if you changed a method which called Test from being static to instance, it would change the meaning in a subtle way.

In other words, I have no problem with this being prohibited :)

来源：https://stackoverflow.com/questions/6033455/why-does-c-sharp-compiler-overload-resolution-algorithm-treat-static-and-instanc