C#Winform通过鼠标拖拽来移动图片

        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
        }
        bool isMouseDown = false;
        System.Drawing.Point p1 = new System.Drawing.Point();
        System.Drawing.Point p2 = new System.Drawing.Point();

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            isMouseDown = true;
            p1 = PointToClient(Control.MousePosition);//记录鼠标坐标
            p2 = pictureBox1.Location;                //记录图片坐标
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            isMouseDown = false;
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            //鼠标坐标的相对改变值
            int a = PointToClient(Control.MousePosition).X - p1.X;
            int b = PointToClient(Control.MousePosition).Y - p1.Y;
            //图片坐标计算&赋值
            if (isMouseDown)
                pictureBox1.Location = new System.Drawing.Point(p2.X + a, p2.Y + b);//图片新的坐标 = 图片起始坐标 + 鼠标相对位移
        }

这个是通过鼠标相对窗体的坐标进行计算pictureBox的坐标来移动图片的