[2005/2008] Change what user clicked on his/her keyboard.

Hello, i have always thought to cancel a key a user pressed, you can just write e.Handled = False. I was wrong...

Below is a quick example of making it so in a textbox if the user clicks the period/decimal it will not enter the period/decimal in the textbox it will enter a comma.

vb Code:

Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
        If e.KeyCode = Keys.OemPeriod Or e.KeyCode = Keys.Decimal Then
            e.SuppressKeyPress = True
            SendKeys.Send(",")
        End If
    End Sub

You can use the above code as a layout, modify it etc...

Code:

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Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
    If e.KeyCode = Keys.OemPeriod Or e.KeyCode = Keys.Decimal Then
        e.SuppressKeyPress = True
        DirectCast(sender, TextBox).SelectedText = ","
    End If
End Sub

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This will insert a comma where ever the cursor is which is the same thing as using SendKeys, except you dont have any un-expected results that SendKeys has.

Quote:

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Originally Posted by JuggaloBrotha

Code:

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Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
    If e.KeyCode = Keys.OemPeriod Or e.KeyCode = Keys.Decimal Then
        e.SuppressKeyPress = True
        DirectCast(sender, TextBox).SelectedText = ","
    End If
End Sub

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This will insert a comma where ever the cursor is which is the same thing as using SendKeys, except you dont have any un-expected results that SendKeys has.

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Whats the downsides of SendKeys?\
Also when i did the TextBox that was only an example.

Place a label on your form and place the following.

vb Code:

Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
        If e.KeyCode = Keys.OemPeriod Or e.KeyCode = Keys.Decimal Then
            e.SuppressKeyPress = True
            SendKeys.Send(",")
        End If
        Label1.Text = e.KeyCode.ToString
    End Sub

Though seeing you on the forums a lot and reading your posts you probally know what it does..lol

Though in the case of a textbox i guess that would prove better.
Unless you can use DirectCast() on a form?

The downside of SendKeys is that if that code runs and a split second the form loses focus before your KeyDown event hits the 'SendKeys' line, then the comma will be sent to the window/program that has the focus. Now in this case it's probably never going to be an issue, but whenever using SendKeys, you have to keep this in mind. 99.999999999% of the time when you use SendKeys, there'll be another method that does the same thing anyways.

In your form example, there's no need to do a DirectCast because you already have the form's instance, it's the 'Me' keyword. In your TB KeyDown example, I did a DirectCast on the 'sender' so if there was more than 1 textbox that uses that KeyDown event code, then it'll work for any combination of TB's, that and if someone copies the code from here and put's it in their project, it's less code for them to change to make it work too.

not working with VS 2003, hic

oh.. i changed the title of this thread so people know its 2005/2008. Though whats wrong in 2003?

Are you copying the code directly?
You cant use the sub that i have already given. You need to copy the code inside the sub. Then place it in your Form1_KeyDown event etc...

I will try get a 2003 version of my code if that's not the problem.

Also Welcome to the forums :cool:

I'm not sure if VS 2003 has the e.SupressKeyPress property in the keydown event or not, the rest of it will work in VS 2003.

Quote:

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Originally Posted by JuggaloBrotha

I'm not sure if VS 2003 has the e.SupressKeyPress property in the keydown event or not, the rest of it will work in VS 2003.

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So what would be an alternate?

Hi noah. These codes are meant for textboxes? I couldn't really understand how i can manipulates my codes to make it work for datagridview.

Oh.. i thought it would work for a DataGridView though i dont use DataGridViews much so i wasnt 100% sure..

If i figure a means of doing it for a DataGridView i will post it.