Question

'Select Case' in vb.net

Asked by: tiehaze

I have the following script which is using 'Select Case':

        Dim ctl As ToolStripButton = CType(sender, ToolStripButton)
        Dim MoveUp As Boolean = False
        Dim thisLV As ListView = AccountsLV

        Select Case ctl.Name
            Case "UpBtn1"
                MoveUp = True
                thisLV = ListView1
            Case "DownBtn1"
                MoveUp = False
                thisLV = ListView1
            Case "UpBtn2"
                MoveUp = True
                thisLV = ListView2
            Case "DownBtn2"
                MoveUp = False
                thisLV = ListView2
            Case "UpBtn3"
                MoveUp = True
                thisLV = ListView3
            Case "DownBtn3"
                MoveUp = False
                thisLV = ListView3
        End Select

As you can see, if the Name of the ToolStripButton begins with "Up", then I want 'MoveUp = True'. If not, then I want 'MoveUp = False'. Then, I want the number at the end of the toolstripbutton name to correspond with the ListView (i.e. DownBtn1 => 'thisLV = ListView1' or UpBtn3 => 'thisLV = ListView3')

Is there anyway to condense this? I am planning on having over 20 cases like this and don't want the code to get to lengthy.

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Asked On
2007-10-03 at 13:04:48ID22870389
Tags

case

,

select

Topics

Microsoft Visual Basic.Net

,

Microsoft Visual Studio Express

,

Visual Studio

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: Idle_MindPosted on 2007-10-03 at 13:29:24ID: 20009788

Sure...try something like:

    Dim ctl As ToolStripButton = CType(sender, ToolStripButton)
    Dim MoveUp As Boolean = ctl.Name.StartsWith("Up")
    Dim thisLV As ListView = Me.Controls.Find("ListView" & ctl.Name.Substring(ctl.Name.IndexOf("Btn") + 3), True)(0)

 

by: smcdrcPosted on 2007-10-03 at 13:32:58ID: 20009821

if ctl.Name.Substring(0, 2).ToUpper.Equals("UP") then
MoveUp = True
else
MoveUp = False
end if

To shorten the 'thisLV', you could take off the last number and use a select case with that.

 

by: tiehazePosted on 2007-10-03 at 13:34:51ID: 20009840

Can you explain the logic of:

Dim thisLV As ListView = Me.Controls.Find("ListView" & ctl.Name.Substring(ctl.Name.IndexOf("Btn") + 3), True)(0)

If you could explain it, then I might be able to use it in other instances

 

by: Idle_MindPosted on 2007-10-03 at 13:50:21ID: 20009937

Working from the inner to the outer we start with:

    "ListView" & ctl.Name.Substring(ctl.Name.IndexOf("Btn") + 3)

This extracts just the number portion of the Control name by grabbing everything past the "Btn" in the controls name.  We then append this number to "ListView" giving us:

    "UpBtn1" --> "ListView1"
    "DownBtn1" --> "ListView1"
    "UpBtn2" --> "ListView2"
    "DownBtn2" --> "ListView2"
    etc...

The Me.Controls.Find() method searches a container for a control that has a matching name.  The second parameter of True/False tells Find() whether to seach child containers.  This is necessary if the ListViews are actually NOT contained directly by the form (such as in a Panel for instance).  The Controls.Find() method returns an ARRAY of Controls that match so the "(0)" part on the end is so that we only use the first match found.

A more verbose version might be:

        Dim ctl As ToolStripButton = CType(sender, ToolStripButton)
        Dim MoveUp As Boolean = ctl.Name.StartsWith("Up")
        Dim thisLV As ListView = AccountsLV
        Dim btnPos As Integer = ctl.Name.IndexOf("Btn")
        If btnPos > -1 Then
            Dim ListViewName As String = "ListView" & ctl.Name.Substring(btnPos + 3)
            Dim matches() As Control = Me.Controls.Find(ListViewName, True)
            If matches.Length > 0 Then
                thislv = matches(0)
            Else
                MessageBox.Show(ListViewName, "Unable to find Corresponding ListView")
            End If
        Else
            MessageBox.Show(ctl.Name, "Unexpected Control Name")
        End If

20120131-EE-VQP-002

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