"ME" <(E-Mail Removed)> wrote in message
news:0I2dnZocj5K7Kw3fRVn-(E-Mail Removed)...
> It appears that IsSubclassOf does not work. In the following example, why
> does
> typeof(IDerived).IsSubclassOf(typeof(IRoot));
> yeild False when the IDerived interface DOES in fact derive from IRoot?
> The IsSubClassOf documentation states the following:
>
> "Determines whether the current Type derives from the specified Type"
>
> Wouldn't an interface be a Type? Basically I want to be able to look at
> an interface TYPE and determine if it is related or derived from another
> Interface TYPE.
Use typeof(IRoot).IsAssignableFrom(typeof(IDerived)), since this determines
if two types can be used interchangeably. IsSubclass determines if a type
derives from another, but interfaces aren't really derived, rather
implemented.
typeof(CDerived).IsSubclassOf(typeof(CRoot));
works as you expect.
>
> Thanks,
>
> Matt
>
> public interface IRoot {}
> public interface IDerived : IRoot {}
> public class RootClass : IRoot {}
> public class DerivedClass : RootClass {}
> class IsSubclassTest
> {
> public static void Main()
> {
> RootClass root = new RootClass();
> DerivedClass derived = new DerivedClass();
> int [] intArray = new int [10];
> Console.WriteLine("Is Array a derived class of int[]? {0}",
> typeof(Array).IsSubclassOf(intArray.GetType())); //False
> Console.WriteLine("Is int [] a derived class of Array? {0}",
> intArray.GetType().IsSubclassOf(typeof(Array))); //True
> Console.WriteLine("Is IRoot a derived class of IDerived? {0}",
> typeof(IRoot).IsSubclassOf(typeof(IDerived))); //False
> Console.WriteLine("Is IDerived a derived class of IRoot? {0}",
> typeof(IDerived).IsSubclassOf(typeof(IRoot))); //False???
> Console.WriteLine("Is RootClass a derived class of DerivedClass? {0}",
> root.GetType().IsSubclassOf(derived.GetType())); //False
> Console.WriteLine("Is DerivedClass a derived class of RootClass? {0}",
> derived.GetType().IsSubclassOf(root.GetType())); //True
> Console.Read();
> }
> }
>
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