how to detect a keypress event in textbox from the form level

Question

0.00/5 (No votes)

See more:

hi i have about 50 textboxes on a single windows form. i dont want to write keypress event for each textbox. is there any parent form level event which detect that there is keypress on any of the textbox.
i have tried so far:

C#

[DllImport("user32.dll"]
internal static extern IntPtr GetFocus();
private Control GetFocusedControl()
        {
            Control focusedControl = null;
            IntPtr focusedHandle = GetFocus();
            if (focusedHandle != IntPtr.Zero)               
            focusedControl = Control.FromHandle(focusedHandle);
            return focusedControl;
        }
private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (GetFocusedControl().GetType().ToString() == "System.Windows.Forms.TextBox")
           
            {
               //my code...
            }
                     
           
        }

but when the active control is a textbox form1_keypress event not being fired??
any help will be highly appreciated....

Posted 17-Oct-12 22:11pm

choudhary.sumit

Add a Solution

3 solutions

Solution 1

set

C#

this.KeyPreview = true;

and use this code

C#

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
       {
           foreach (Control con in this.Controls)
           {
               if (con is TextBox)
               {
                   if (con.Focused)
                   {
                       //Do somthing for Focused text box
                       con.Text = "s";
                   }
               }
           }
       }

or use this code:

C#

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
    Control con = this.ActiveControl;
    if (con is TextBox)
    {
            //Do somthing for Focused text box or Write event
            con.Text = "s";
    }
}

Posted 17-Oct-12 22:20pm

Alister007

Updated 17-Oct-12 22:37pm

v3

Solution 3

Form.KeyPreview Property[^]

Just set

C#

this.KeyPreview = true;

in the constructor & you will able to receive all KeyPress, KeyDown, and KeyUp events

Posted 17-Oct-12 22:29pm

Sushil Mate

Updated 17-Oct-12 22:30pm

v2

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)

adriancs · Accepted Answer · 2012-10-17T22:24:00

C#

public Form1()
{
    InitializeComponent();
    CreateKeyPressEvent(this.Controls);
}

void CreateKeyPressEvent(System.Windows.Forms.Control.ControlCollection ctrls)
{
    foreach (Control c in ctrls)
    {
        if (c is TextBox)
        {
            c.KeyPress += new KeyPressEventHandler(c_KeyPress);
        }
        else
            CreateKeyPressEvent(c.Controls);
    }
}

void c_KeyPress(object sender, KeyPressEventArgs e)
{
    TextBox tb = (TextBox)sender;
    // Do whatever you want with this "tb"
}