Testing object type

[Monkey36]

I'm not quite sure how to explain why I want to do this without going into a long-winded explanation, so I'll just skip that bit.

I'm wondering if anyone can help me out with some code to determine object type - essentially, I've got an object that may be an instance of one of two types, and I'd like to test which it is, but I can't for the life of me work out how!

Dim obj As Object = New Class1

If (obj Is Class1) Then
 MsgBox("Object is of type Class1")
ElseIf (obj Is Class2) Then
 MsgBox("Object is of type Class2")
Else
 MsgBox("Don't know!")
End If

Well, you get the idea, this is what I'd like to do, but this code doesn't work ("'Class1' is a type and cannot be used as an expression"), but I can't find out how I should do it!

Do be honest, I'm struggling a bit find search terms to put into Google to help me out.

If anyone could point me in the right direction it would be much appreciated!

Cheers,
Dan.

 

[ThatRickGuy]

Try using obj.GetType().equals(o as type). or use obj.gettype().tostring() to get the name of the class and compare it that way.

-Rick

VB.Net Forum forum796 forum855 ASP.NET Forum
I believe in killer coding ninja monkeys.

 

[earthandfire]

You could use TypeOf as follows:

Dim obj As New Class1
If TypeOf obj Is Class1 Then
MessageBox.Show("Class1")
ElseIf TypeOf obj Is Form1 Then
MessageBox.Show("Form1")
Else
MessageBox.Show("Unknown")
End If

Hope this helps.

 

[earthandfire]

I misread your original code sample - this also works:

Dim obj As Object = New Class1
If TypeOf obj Is Class1 Then
MessageBox.Show("Class1")
ElseIf TypeOf obj Is Form1 Then
MessageBox.Show("Form1")
Else
MessageBox.Show("Unknown")
End If

Hope this helps.

 

[SBendBuckeye]

Not sure this adds much to the discussion, but you can always use obj.Name to display it.

Have a great day!

j2consulting@yahoo.com

 

[Monkey36]

earthandfire - thank you! I was sure I'd seen it done before, but I couldn't for the life of me find it!

Thanks a lot,
Dan.