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

问题

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

i.e. typeof(ChildClass).XXX(typeof(ParentClass)

回答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));

回答2:

typeof(ParentClass).IsAssignableFrom(typeof(ChildClass))

回答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.

来源：https://stackoverflow.com/questions/1185559/in-c-sharp-what-is-the-equivalent-of-is-keyword-but-using-type-objects