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[DllImpart("User32.dll")]
static extern short GetKeyState(int nVirtKey);
void Form1_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left && // 鼠标左键
(Control.ModifierKeys & Keys.Alt) == Keys.Alt && // Alt按下
(Control.ModifierKeys & Keys.Control) == Keys.Control) // Control按下
{
MessageBox.Show("Action...");
}
}