【NCRE】C# WindowForm实现屏幕最顶端拖动

   需求：

    代码：

<span style="font-size:24px;">        private Point mouseOffset; 　　　　//记录鼠标指针的坐标
private bool isMouseDown = false; //记录鼠标按键是否按下
private bool isBoundary = false;    //是否在边界上
private void frmxuanfukuang_MouseDown_1(object sender, MouseEventArgs e)
{
int xOffset;
//int yOffset;
if (e.Button == MouseButtons.Left)
{
xOffset = -e.X - SystemInformation.FrameBorderSize.Width;
//yOffset = -e.Y - SystemInformation.CaptionHeight - SystemInformation.FrameBorderSize.Height;
mouseOffset = new Point(xOffset, 0);
//this.MouseMove += frmxuanfukuang_MouseMove;
isBoundary = false;
isMouseDown = true;
}

}

private void frmxuanfukuang_MouseMove_1(object sender, MouseEventArgs e)
{
Rectangle ScreenArea = System.Windows.Forms.Screen.GetWorkingArea(this);
int screenWidth = ScreenArea.Width; //屏幕宽度
Point mousePos = Control.MousePosition;
mousePos.Offset(mouseOffset.X, 0);
if (this.Location.X < 0)
{
this.Location = new Point(10, this.Location.Y);
isMouseDown = false;
}
if (this.Location.X + this.Width > screenWidth)
{
this.Location = new Point(screenWidth - 10 - this.Width, this.Location.Y);
isMouseDown = false;
}

if (isMouseDown == true)
{
mousePos.Y = 0;
Location = mousePos;
}
}

private void frmxuanfukuang_MouseUp_1(object sender, MouseEventArgs e)
{

// 修改鼠标状态isMouseDown的值
// 确保只有鼠标左键按下并移动时，才移动窗体
if (e.Button == MouseButtons.Left)
{
//this.MouseMove -= frmxuanfukuang_MouseMove;
isMouseDown = false;
}
}
//设置窗体显示状态
[DllImport("user32.dll")]
private static extern int SetWindowPos(IntPtr hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
</span>