Thank's for that, So it appears that IsAssignable function only works with
specified generics types not generic definition types.
The following function now does what I need.
Called like so
IsAssignableFromGenericType(<SomeTypeToCheck>,
GetType(BusinessListBase(Of )))
Private Function IsAssignableFromGenericType(ByVal typeToCheck As
System.Type, ByVal genericTypeToCompare As System.Type) As Boolean
Do
If typeToCheck.IsGenericType Then
Dim genTypeDef As System.Type = typeToCheck.GetGenericTypeDefinition
If genTypeDef.Equals(genericTypeToCompare) Then
Return True
End If
End If
typeToCheck = typeToCheck.BaseType
Loop While typeToCheck.BaseType IsNot Nothing
End Function
Regards
"Herfried K. Wagner [MVP]" <hi***************@gmx.at> wrote in message
news:u$**************@TK2MSFTNGP14.phx.gbl...
"Joe Adams" <a@b.com> schrieb: How can I use GetType(<GenericType>).IsAssignableFrom(<MyType>)
I need to now if the <MyType> is the same type of class as the
<GenericType> without having to add the generic type member members.
i.e. I do not want to use GetType(<GenericType>(Of
String).IsAssignableFrom(<MyType>)
I've tried using
GetType(<GenericType>(Of ,).IsAssignableFrom(<MyType>) but it always
returns false.
Assuming you have two types 'A' and 'B', and 'B' inherits from 'A'. In
addition, you have a generic class 'Foo(Of T)'. In this case, 'Foo(Of A)'
is not the supertype of 'Foo(Of B)', althoigh 'A' is the supertype of 'B'!
Thus
'GetType(Object).IsAssignableFrom(Foo(Of ))'
will evaluate to 'True' while
'GetType(Foo(Of A)).IsAssignableFrom(GetType(Foo(Of B))'
evaluates to 'False'.
Assuming you have these classes
\\\
Public Class Foo(Of T)
End Class
Public Class Goo
Inherits Goo(Of Integer)
End Class
Public Class Boo
Inherits Goo
End Class
///
then
'GetType(Foo(Of ).IsAssignableFrom(GetType(Goo))'
will return 'False', although
'GetType(Goo).IsAssignableFrom(GetType(Boo))'
returns 'True'.
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
