Override Paste Into TextBox

Question

I want to override the paste function when in a specific textbox. When text is pasted into that textbox, I want it to execute the following:

AddressTextBox.Text = Clipboard.GetText().Replace(Environment.NewLine, " ");

(Changing from multiline to single)

How can I do this?

check this one: stackoverflow.com/questions/3446233/…

Davide Piras
– Davide Piras

2011-10-21 16:40:00 +00:00
Commented Oct 21, 2011 at 16:40 — Davide Piras
– Davide Piras, Commented Oct 21, 2011 at 16:40

Irshad · Accepted Answer · 2015-06-05 06:43:55Z

33

That's possible, you can intercept the low-level Windows message that the native TextBox control gets that tells it to paste from the clipboard. The WM_PASTE message. Generated both when you press Ctrl+V with the keyboard or use the context menu's Paste command. You catch it by overriding the control's WndProc() method, performing the paste as desired and not pass it on to the base class.

Add a new class to your project and copy/paste the code shown below. Compile. Drop the new control from the top of the toolbox onto your form, replacing the existing one.

using System;
using System.Windows.Forms;

class MyTextBox : TextBox {
    protected override void WndProc(ref Message m) {
        // Trap WM_PASTE:
        if (m.Msg == 0x302 && Clipboard.ContainsText()) {
            this.SelectedText = Clipboard.GetText().Replace('\n', ' ');
            return;
        }
        base.WndProc(ref m);
    }
}

edited Jun 5, 2015 at 6:43

Irshad

3,1415 gold badges33 silver badges57 bronze badges

answered Oct 21, 2011 at 17:01

Hans Passant

946k151 gold badges1.8k silver badges2.6k bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

cb1295 Over a year ago

Do I put this in the Program.cs or the Form1.cs? And do I need to call it some how? because it isn't working

Hans Passant Over a year ago

You put this in a separate class. Compile. Drop the new control from the top of the toolbox onto your form.

Haris Hasan · Accepted Answer · 2011-10-21 17:01:54Z

5

To intercept messages in textbox control, derive a class from TexBox and implement

class MyTB : System.Windows.Forms.TextBox
{

    protected override void WndProc(ref Message m)
    {
        switch (m.Msg)
        {

            case 0x302: //WM_PASTE
                {
                    AddressTextBox.Text = Clipboard.GetText().Replace(Environment.NewLine, " ");
                    break;
                }

        }

        base.WndProc(ref m);
    }

}

suggested here

edited Oct 21, 2011 at 17:01

answered Oct 21, 2011 at 16:43

Haris Hasan

30.1k13 gold badges97 silver badges124 bronze badges

3 Comments

cb1295 Over a year ago

If I put this in my Form1.cs I get the following error: Error Cannot access a non-static member of outer type via nested type and If I put into Program.cs It says that AddressTextBox does not exist in the current context.

Haris Hasan Over a year ago

Add a new class through project->Add New Item - class name it MyTb. When you will build the project the MyTB will appear in toolbox. You can place it on your Form.

cb1295 Over a year ago

Thanks for the detailed explanation, however your code didn't do the trick or I didn't use it correctly. Thanks anyways!

Collectives™ on Stack Overflow

Override Paste Into TextBox

2 Answers 2

2 Comments

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related