C# Winform Panel 拖动图片到Panel外
在C#的Winform中放一个panel；
在Panel中动态生成图片；
想要把图片拖出Panel外，且图片跟着鼠标移动；
利用MouseDown,MouseMove,MouseUp对图片进行拖动；
但不管怎么拖动图片，图片都不能离开Panel
跪求各位大师给个建议吧

 
Point p = new Point();
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            p.X = e.Location.X;
            p.Y = e.Location.Y;
            pictureBox1.MouseMove +=pictureBox1_MouseMove;
        }

        private void pictureBox1_MouseMove(object sender ,MouseEventArgs e) 
        {
            pictureBox1.Location = new Point(pictureBox1.Location.X + e.Location.X - p.X, pictureBox1.Location.Y + e.Location.Y - p.Y);
            pictureBox1.MouseUp += pictureBox1_MouseUp;
        }

        private  void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            pictureBox1.Location = new Point(p.X, p.Y);
            pictureBox1.MouseMove -= pictureBox1_MouseMove;
        }

C#? Winform ?Panel? 拖动图片
[解决办法]
使用Drag 和DropDown试试吧，将图片移动出去，相当于将图片从panel中删除，放到其他panel中，或者其他地方
[解决办法]
想要把图片拖出Panel外，且图片跟着鼠标移动，请在鼠标移出Panel时，设置pictureBox.Parent为移入的容器
[解决办法]
Rectangle r1 = panel1.Bounds;
Rectangle r2 = new Rectangle(panel1.Bounds.X + pictureBox1.Bounds.X, panel1.Bounds.Y + pictureBox1.Bounds.Y, pictureBox1.Bounds.Width,
if (!r1.Contains(r2))
{
pictureBox1.Parent = this;
}
else
{
pictureBox1.Parent = panel1;
}

在MouseMove里加上面的代码判断picturebox是否超出panel,r1,r2定义成全局变量,当移出去的时候,把被遮挡的部分用panel1.CreaeGraphics.DrawImage画到panel上