winform click點擊事件 左鍵 OR 右鍵

1.Click事件——EventArgs強轉MouseEventArgs

button1.Click += new System.EventHandler(button1_Click);  
private void button1_Click(object sender, EventArgs e)  
{  
        //EventArgs繼承自MouseEventArgs,所以可以強轉  
        //把EventArgs強制轉換成MouseEventArgs就可以判斷鼠標左右鍵了
        MouseEventArgs Mouse_e = (MouseEventArgs)e;  
  
        //判斷點擊鼠標左鍵或右鍵
        if (Mouse_e.Button == MouseButtons.Left)  
        {  
            MessageBox.Show("這是鼠標左鍵");  
            //這里寫鼠標左鍵點擊事件
        }  
        else if (Mouse_e.Button == MouseButtons.Right)  
        {  
            MessageBox.Show("這是鼠標右鍵");  
            //這里寫鼠標左鍵點擊事件
        }  
}  

2.通過MouseDown委托

button2.MouseDown += new MouseEventHandler(button2_MouseDown);  
private void button2_MouseDown(object sender, MouseEventArgs e)  
{
        //判斷點擊鼠標左鍵或右鍵
        if (Mouse_e.Button == MouseButtons.Left)  
        {  
            MessageBox.Show("這是鼠標左鍵");  
            //這里寫鼠標左鍵點擊事件
        }  
        else if (Mouse_e.Button == MouseButtons.Right)  
        {  
            MessageBox.Show("這是鼠標右鍵");  
            //這里寫鼠標左鍵點擊事件
        }  
 }