How to detect tab key pressing in C#?

Question

I want to detect when tab key is pressed in a textBox and focus the next textbox in the panel.

I have tried out keyPressed method and keyDown method. But when I run the program and debug those methods are not calling when the tab key is pressed. Here is my code.

private void textBoxName_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Tab)
    {
        textBoxUsername.Focus();
    }
}

private void textBoxName_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar==(char)Keys.Tab)
    {
        textBoxUsername.Focus();
    }
}

Please correct me.Thank you.

Answer 1

Why do you need that complication at all? WinForms does it for you automatically. You just need to set the correct tab order.

Answer 2

转到文本框的属性并指定tabindex的正确顺序

Answer 3

您应该使用tabOrder。

Answer 4

You want the "leave" event. I just threw this into the default C# WinForms application:

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        /* 
              ... misc housekeeping ... 
        */

        private void OnLeave(object sender, EventArgs e)
        {
            lblMsg.Text = "left field 1";
        }

        private void OnLeave2(object sender, EventArgs e)
        {
            lblMsg.Text = "left field 2";
        }
    }
}

It works as you would expect. Obviously you can do anything you want in the Leave() handler, including forcing the focus elsewhere, but be careful not to confuse the user...

Answer 5

您可以尝试像这样重写ProcessCmdKey方法

Answer 6

If textBoxName has a focus while pressing the TAB Key , then only the "KeyDown" event triggers. You just need to set the correct tab order.

Answer 7

If you are dealing with the text boxes inside a Panel, setting the correct tab index should do the job perfectly. But, if you are dealing with other text box from other Panel say:

panel1 has textbox1

panel2 has textbox2

panel3 has textbox3

Here's what you need to do:

1. Set the TabStop = False property of all the textboxes. By default, this is set to True.

2. Set the correct TabIndex for each panel, eg

   panel1 TabIndex = 0; panel2 TabIndex = 1; panel3 TabIndex = 2;

3. Then try this code

   private void textBox1_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode.Equals(Keys.Tab)) this.textBox3.Focus(); }