C#判断鼠标在某个区域内

Rectangle rectangle = new Rectangle(区域的坐标和大小);
if (rectangle.Contains(MousePosition))
{
}

Rectangle rectangle = 控件名称.RectangleToClient(this.ClientRectangle);
if (rectangle.Contains(MousePosition))
{
}

this.panel1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseMove);//添加mousemove事件 在Form初始化函数中添加
private void panel1_MouseMove(object sender,MouseEventArgs e)
{
//鼠标响应panel左上1/4区域
if (e.X > 0 && e.X < (this.panel1.Size.Width / 2) && e.Y > 0 && e.Y < (this.panel1.Size.Height / 2))
{
this.toolStripLabel1.Text = "Capture mouse";//Label标签（要想用，别忘了先添加一个），测试用。
}
else
{
this.toolStripLabel1.Text = "Can't capture mouse";
}
}