In C# what is the equivalent of “is” keyword but using Type objects

Question

An easy question I guess, but in the documentation of the Type class they only talk of interfaces on the GetInterfaces method.

ie typeof(ChildClass).XXX(typeof(ParentClass)

Answer 1

It depends on what you need; IsAssignableFrom, perhaps:

bool stringIsObj = typeof(object).IsAssignableFrom(typeof(string));

or IsSubclassOf :

bool stringIsObj = typeof(string).IsSubclassOf(typeof(object));

Answer 2

typeof运算（父类）.IsAssignableFrom（typeof运算（ChildClass））

Answer 3

I suggest you search for an equivalent. Instead of using the "is" keyword like this:

if (object is class)
{ ... }

you could simply compare the types of those two like this:

if( typeof(object) == typeof(class)
{ ... }

BUT: this is not the same, the "is" keyword can determine if the object-class is of the specified class, an inheritence of that class, implements the interface, etc, whereas the typeof() equivalence just compares the actual type.