winform窗体的样式很单一，不够漂亮，往往我们需要对窗体进行重写，但是我们又要保留在重写前窗体本身带的功能，例如拖动窗体的头进行移动之类的。
一下方式可以实现该方法：
[DllImport("user32")]
public static extern int ReleaseCapture();
[DllImport("user32")]
public static extern int SendMessage(IntPtr hwnd, int msg, int wp, int lp);
/// <summary>
/// 是否允许移动
/// </summary>
bool IsMove = false;
/// <summary>
/// 判断鼠标是否在可移动范围内按下
/// </summary>
private void Form_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
Rectangle rect = new Rectangle(, , this.Width - , labMin.Height); //允许拖动的矩形范围
this.IsMove = rect.Contains(new Point(e.X, e.Y)); //鼠标按下的点是否在允许拖动范围内
}
}
/// <summary>
/// 鼠标弹起时取消移动
/// </summary>
private void Form_MouseUp(object sender, MouseEventArgs e)
{
this.IsMove = false;
}
/// <summary>
/// 移动窗体
/// </summary>
private void Form_MouseMove(object sender, MouseEventArgs e)
{
if (this.IsMove && e.Button == System.Windows.Forms.MouseButtons.Left && this.WindowState != FormWindowState.Maximized)
{
ReleaseCapture();
SendMessage(Handle, , + , );
return;
}
}