CODEWITHSUNDEEP
c#winformsvisual-studio-2010textbox
cb1295
cb1295

Reputation: 753

Override Paste Into TextBox

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?

Upvotes: 12

Views: 14520

Answers (2)

Hans Passant
Hans Passant

Reputation: 942348

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);
    }
}

Upvotes: 33

Haris Hasan
Haris Hasan

Reputation: 30127

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

Upvotes: 5

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