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  C# 判斷 上/下/左/右/ESC/Enter 鍵盤輸入   private void textBox1_KeyDown(object sender, KeyEventArgs e) {     String direction;     if (e.KeyCode == Keys.Down)         direction = “down”;     if (e.KeyCode==Keys.Left)         direction = “left”;     if (e.KeyCode==Keys.Right)         direction = “right”;     if (e.KeyCode==Keys.Up)         direction = “up”;     if (Keys.Escape)         direction = “ESC”;     if (e.KeyCode == Keys.Enter)         direction = “Enter”; }