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Different forms in the same array

Posted on 2012-03-11
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Last Modified: 2012-03-22
I have some Arrays with Forms and that works fine. All the elements in any array are from the same Form (class).

I can access the Forms properties with Form(X).

I am now trying to craete a double array that will hold forms from diferent clases. I have defined the array like this
Friend Form(,) As Form.

And then later redefined it like this:
ReDim Form(NumFormSets, NumForms)

I create a form instance like this:
Form(1, 1) = New Form1()
Form(1, 2) = New Form2()
.........
Form(2, 1) = New Form1()
Form(2, 2) = New Form2()
.........

The purpose with all this is that I now can process all the forms using indexes in a very simple way.

But there seams to be some problems. One of them is that my array is of type Form. All the elements are of specific Form clases. I am trying to cast but dosent seam to get it right.

How can this be done?
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Question by:daghoff
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by:nepaluz
ID: 37707360
Why not use a Dictionary(Of Integer, Form) as a substitute to your array?
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Accepted Solution

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Mike Tomlinson earned 500 total points
ID: 37707422
"I am trying to cast but dosent seam to get it right."

...and what are you doing to cast it?

Should be something like:
    If TypeOf Form(2, 1) Is Form1 Then
        Dim F1 As Form = DirectCast(Form(2, 1), Form1)
        ' ... do something with "F1" ...
    End If

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*I wouldn't use "Form" as the name of your Array since that is a pre-defined class name.  Change that to something else!
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by:käµfm³d 👽
ID: 37707471
Unless your "specialized" forms don't inherit from Form, you shouldn't need to cast anything. Since the specialized version have Form as part of their type hierarchy, you should be able to use implicit type conversion without incident. The only time that I can see where you might run into problem is if you were trying to convert a Form1 to a Form2. In that case, I wouldn't expect a natural conversion because you would be talking about converting between "siblings" rather than base/derived.
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by:Mike Tomlinson
ID: 37707480
*Oops...in my snippet, this:

    Dim F1 As Form

Should be:

    Dim F1 As Form1
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Expert Comment

by:käµfm³d 👽
ID: 37707580
Disregard my previous comment. I think I misunderstood what you meant by casting.
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