What is the C# equivalent to Java's instanceof and isInstance()?

Question

I know of is and as for instanceof, but what about the reflective isInstance() method?

Answer 1

bool result = obj.GetType().IsAssignableFrom(otherObj.GetType());

Answer 2

just off the top of my head, you could also do:

bool result = ((obj as MyClass) != null)

Not sure which would perform better. I'll leave it up to someone else to benchmark :)

Answer 3

bool result = (obj is MyClass); // Better than using 'as'

Answer 4

Depends, use is if you don't want to use the result of the cast and use as if you do. You hardly ever want to write:

if(foo is Bar) {
    return (Bar)foo;
}

Instead of:

var bar = foo as Bar;
if(bar != null) {
    return bar;
}