Interface at run time

[fred]

Is there a way I can find out at run time whether a particular interface has
been implemented by an instance of a class.

Thanks for any help
Fred

 

[Bob Powell [MVP]]

You can use the is keyword such as

dim i as IMyInterface=nothing
if(myobject is IMyInterface) then
i=DirectCast(myobject, IMyInterface)
'use the interface here...
i.MyMethod()
end if


--
Bob Powell [MVP]
Visual C#, System.Drawing

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[Larry Serflaten]

Is there a way I can find out at run time whether a particular interface has
been implemented by an instance of a class.

Try TypeOf:

If TypeOf SomeObject Is IDisposable Then SomeObject.Dispose


LFS

 

[Herfried K. Wagner [MVP]]

Bob,

You can use the is keyword such as

dim i as IMyInterface=nothing
if(myobject is IMyInterface) then

That would work in C#. For VB.NET, use 'If TypeOf ... Is ... Then...'.

 

[Imran Koradia]

In addition to other replies, you can also use IsAssignableFrom method of
the Type Class. Here's an example:

Public Class TestClass
Implements IDisposable

Public Sub Dispose() _
Implements System.IDisposable.Dispose

End Sub
End Class

MessageBox.Show( _
GetType(IDisposable).IsAssignableFrom( _
GetType(TestClass)).ToString)

This will return True since TestClass does implement the IDisposable
interface.

Just an additional option...


hope that helps..
Imran.

 

[Bob Powell [MVP]]

oops... typeof..

Thanks Herfried...

--
Bob Powell [MVP]
Visual C#, System.Drawing

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

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