禁用文本框中的某些键盘操作。 （VC# Windows 窗体应用程序）

Question

I'm making a game with TextBox es but they can cheat if they use ctrl + a or ctrl + z . How do I make those actions enabled within my textBoxes?

I tried doing this:

private void Form1_Load(object sender, EventArgs e)
{
    foreach (Control x in this.Controls)
    {
        if (x is TextBox)
        {
            ((TextBox)x).KeyDown += textBox_KeyDown;
        }
    }          
}

static void textBox_KeyDown(object sender, KeyEventArgs e)
{

    if(e.KeyCode == Keys.Z && e.KeyCode == Keys.ControlKey)
    {
        e.SuppressKeyPress = true; 
    }
    if (e.KeyCode == Keys.A && e.KeyCode == Keys.ControlKey)
    {
        e.SuppressKeyPress = true;
    }
}

Answer 1

KeyDown event occurs when a key is first pressed. Instead, Use KeyPress event which occurs when a control has focus and the user presses and releases a key. KeyPress event has KeyPressEventArgs . SO you will have to use e.handled = true instead of e.SuppressKeyPress event.

For using Keyboard class and Key enum, you have to add PresentationCore and WindowsBase assemblies to your project references.

KeyPress event:

static void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if ((Control.ModifierKeys & Keys.Control) == Keys.Control)
    {
        if (Keyboard.IsKeyDown(Key.A))
        {
            e.Handled = true;
        }
        if(Keyboard.IsKeyDown(Key.Z))
        {
            e.Handled = true;
        }
    }
}

I trust this helps you with your problem.