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.NET Forum / Languages / C# / March 2008

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Comparing Type variables

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Jeronimo Bertran - 14 Mar 2008 07:55 GMT
I have a questions regarding comparing types.  Suppose I have the following
classes:

class class1
{
}

class derivedClass : class1
{
}

derivedClass myObject;

I now have a function that takes a Type as a parameter

bool TestType(object o, Type typeToTest)
{

       // accomplish something like return (o is typeToTest)

       return o is typeToTest;  // This won't work because typeToTest is a
variable and not the actual type but I want to be able to check if o is
derived from the type supplied.

       return o.GetType() == typeToTest;  // This doesn't work either
because it only checks if the object is of the given type but not if it can
be casted to the given type.

}

bool result = TestType (myObject, typeof(class1));

Thanks

Jeronimo
Peter Duniho - 14 Mar 2008 08:21 GMT
> [...]
>         return o is typeToTest;  // This won't work because typeToTest is a
> variable and not the actual type but I want to be able to check if o is
> derived from the type supplied.

See Type.IsInstanceOf()
http://msdn2.microsoft.com/en-us/library/system.type.isinstanceoftype.aspx

Pete
Jeronimo Bertran - 14 Mar 2008 17:59 GMT
> http://msdn2.microsoft.com/en-us/library/system.type.isinstanceoftype.a
> spx

Great .. thanks Pete
Jeronimo Bertran - 14 Mar 2008 17:59 GMT
> http://msdn2.microsoft.com/en-us/library/system.type.isinstanceoftype.a
> spx

Great .. thanks Pete

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