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private void txtHotkey_KeyDown(object sender, KeyEventArgs e)
{
// 如果按下组合键CTRL+R
string keydown = "";
if (e.Control)
{
keydown += "Ctrl + ";
}
if (e.Alt)
{
keydown += "Alt + ";
}
if (e.Shift)
{
keydown += "Shift + ";
}
if(e.KeyCode>=Keys.A && e.KeyCode<=Keys.Z)
keydown += e.KeyCode;
this.txtHotkey.Text = keydown;
this.txtHotkey.SelectionStart = this.txtHotkey.Text.Length;
}