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How do I use an openfiledialog box in a class?

Posted on 2004-10-02
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Last Modified: 2010-04-23
I have a form to open a text file and count the number of characters, words, sentences and paragraphs.  I am trying to use a class to do all of the work but cannot figure out how to refence labels and buttons on the form in the class?  Any suggextions?
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Question by:BrianLetterman
2 Comments
 
LVL 86

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Mike Tomlinson earned 252 total points
ID: 12210439
You can pass in a reference to either the form containing your labels and buttons, or directly pass references to your labels and buttons into your class.  You can do this either is several ways:

1) Use the constructor of your class:

Public Class Foo

    Private f As Form

    Public Sub New(ByVal sourceForm As Form)
        f = sourceForm
    End Sub

End Class

From a form:
    Dim clsFoo As New Foo(Me)

2) Make your form reference variable public in your class:

Public Class Foo

    Public f As Form

End Class

From a form:
    Dim clsFoo As New Foo()
    clsFoo.f = Me

3) Pass in a reference directly to a sub/function in your class:

Public Class Foo

    Public Sub updateSomeValue(ByVal lbl As Label)
        lbl.Text = "3.14159"
    End Sub

End Class

From a form:
    Dim clsFoo As New Foo()
    clsFoo.updateSomeValue(Me.Label1)
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LVL 7

Assisted Solution

by:J_Mak
J_Mak earned 248 total points
ID: 12210471
I don't know where openfiledialog box comes into the picture but it's very trivial to reference labels and buttons in a class. What you could do is in your class you could create a property like so:

Public Class YourClassName

    Private formReference As frmName

    Friend Property FormToAccess() As frmName
        Get
            FormToAccess = formReference
        End Get
        Set(ByVal Value As frmName)
            formReference = Value
        End Set
    End Property
    .......

End Class

And in your code behind the form, you could do something like this:

Public Class frmName
    Inherits System.Windows.Forms.Form

    Dim cls As YourClassName = New YourClassName
    .....
    cls.FormToAccess = Me 'This line assigns this form to the class's 'FormToAccess' property, hence you can access any of the forms labels or buttons using it.
    ....

End Class

I hope that is understandable. Cheers.
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