Disallowing paste (Ctrl+V) in a WPF TextBox.

Question

0.00/5 (No votes)

See more:

I am binding a TextBox in a WPF window dynamically from a UserControl(which is a TextBox UserControl) and it should not allow the user to Paste(Ctrl+V) text into the textBox. So I have written this code in code behind and got struck up at this method.

private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            UserControl1 ntb = new UserControl1();
            ntb.Margin = new Thickness(5, 2, 10, 2);

            //KeyBinding kb = new KeyBinding(ApplicationCommands.NotACommand, Key.V, ModifierKeys(Key.Left));
            KeyBinding kb = new KeyBinding();
            kb.Command = ApplicationCommands.NotACommand;
            kb.Key = Key.V;
            kb.Modifiers = ModifierKeys(Key.LeftCtrl);
            
           
            ntb.textBox1.InputBindings.Add(kb);
        }

        private ModifierKeys ModifierKeys(Key key)
        {
            throw new NotImplementedException();
        }

***** So what shouldIi write in the method ModifierKeys(Key key) to return.

Can anybody help me regarding this?

Thanks in Advance.

Posted 16-Jun-10 4:19am

sarath.mk

Updated 16-Jun-10 4:27am

Johnny J.

v2

Add a Solution

3 solutions

Solution 1

For an alternate approach to what you are trying above, see here.

Posted 16-Jun-10 4:31am

Abhinav S

Solution 2

Hai.... thanks that alternative i know, but here the textbox is creating dynamically in wpf form so i cant write the xaml code there.

Posted 16-Jun-10 20:40pm

sarath.mk

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Vineeth P Joseph · Accepted Answer · 2010-06-16T21:12:00

Hi,
I think Abhinav's solution is good.There explains how to disable the paste command using xaml and by code dynamically.

DataObject.AddPastingHandler(ntb.textBox1, new DataObjectPastingEventHandler(OnPasteCommand));

use the event handler as

C#

void  OnPasteCommand(object sender, DataObjectPastingEventArgs e)
   {
     e.CancelCommand();
   }

If you would like to use your approch,the problem here is the Paste command doesn't execute on Ctrl+v but it still possible to paste through the context menu of textbox.Still you would like to choose your approch you can use the code like

KeyBinding vBinding = new KeyBinding(ApplicationCommands.NotACommand,new KeyGesture(Key.V, ModifierKeys.Control));
      ntb.textBox1.InputBindings.Add(vBinding);