如何在textBox里面捕获键盘输入，包括组合键。

[嵌入式乌托邦]

刚刚学习C#，想捕获键盘输入，在组合键这里卡住了。按了ctrl+a，结果显示的是ctrl+A，后面字母都是大写的。按单个按键吧，显示的又是一个大写一个小写。用了KeyDown事件总是不是预想的。

private void textBox_KeyDown(object sender, KeyEventArgs e)
        {
            keystr = "";
            if (e.Control)
            {
                if (!keystr.Contains("Ctrl+"))
                    keystr += "Ctrl+";
            }

            keystr += e.KeyCode.ToString();

            //MessageBox.Show(keystr);
            textBox.Text = keystr;
            textBox.Select(textBox.Text.Length, 0);//光标定位到文本最后
            textBox.ScrollToCaret();//滚动到光标处
        }

[desperaso]

private void textBox1_KeyDown(object sender, KeyEventArgs e)
        {
            e.Handled = false;
            if (e.Modifiers.CompareTo(Keys.Control) == 0 && e.KeyCode == Keys.A)
            {
                MessageBox.Show("Press Ctrl+A");
            }
        }

[八爻老骥]

用 Control.ModifierKeys 属性

[八爻老骥]

private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
    // Initialize the flag to false.
    nonNumberEntered = false;

    // Determine whether the keystroke is a number from the top of the keyboard.
    if (e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9)
    {
        // Determine whether the keystroke is a number from the keypad.
        if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9)
        {
            // Determine whether the keystroke is a backspace.
            if(e.KeyCode != Keys.Back)
            {
                // A non-numerical keystroke was pressed.
                // Set the flag to true and evaluate in KeyPress event.
                nonNumberEntered = true;
            }
        }
    }
    //If shift key was pressed, it's not a number.
    if (Control.ModifierKeys == Keys.Shift) {
        nonNumberEntered = true;
    }
}

[enaking]

2楼正解。。。。。。。。