c#中拖动图片的例子

这个问题来自论坛提问，并没有什么难度，也不需要重画内容。当然还有一种方法是通过api发送WM_SysCommand 和SC_MOVE，也就是拖动无标题窗体的方法 ，但是效果没有这个好。

using  System;
using  System.Drawing;
using  System.Windows.Forms;
namespace  WindowsApplication2
... {
     public   partial   class  Form1 : Form
     ... {
         static   string  strDown  =   @" AAACAAEAICAAAAsACQAwAQAAFgAAACgAAAAgAAAAQAAAAAEAAQAAAAAAAAIAAAAA
                       AAAAAAAAAAAAAAAAAAAAAAAA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
                       AAAAAAAAAAf4AAAD8AAAA/AAAAPwAAAH+AAAD/gAAB/8AAA//AAAN/wAACf+AAAH
                       9gAADbQAAA2wAAAJsAAAAIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
                       AAAAAAAA////////////////////////////////////////////8AP///gH///4
                       B///+Af///AD///gA///wAH//4AB//+AAf//gAD//4AA///AAP//4AH//+AH///g
                       D////j////////////////////////////////////////////8= " ;
         static   string  strUp  =   @" AAACAAEAICAAAAoACAAwAQAAFgAAACgAAAAgAAAAQAAAAAEAAQAAAAAAAAIAAA
                        AAAAAAAAAAAAAAAAAAAAAAAAAA////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
                        AAAAAAAAAAAAAf4AAAD8AAAA/AAAAPwAAAH+AAAD/gAAB/8AAA//AAAd/wAAGf+
                        AAAH9gAADbYAAA2yAAAZsAAAGbAAAAGAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
                        AAAAAAAAAAAAA////////////////////////////////////////////8AP///
                        gH///4B///+Af///AD///gA///wAH//4AB//8AAf//AAD//4AA///gAP//4AD//
                        8AF///AB///5A////5///////////////////////////////////////8= " ;

        Cursor curUp  =   new  Cursor( new  System.IO.MemoryStream(Convert.FromBase64String(strUp)));
        Cursor curDown  =   new  Cursor( new  System.IO.MemoryStream(Convert.FromBase64String(strDown)));
         public  Form1()
         ... {
            InitializeComponent();
             this .pictureBox1.Cursor  =  curUp;
        }

         bool  bDragging  =   false ;
        Point pClicked;

         private   void  pictureBox1_MouseDown( object  sender, MouseEventArgs e)
         ... {

            bDragging  =   true ;
            pClicked  =   new  Point(e.X, e.Y);
             this .pictureBox1.Cursor  =  curDown;
        }

         private   void  pictureBox1_MouseMove( object  sender, MouseEventArgs e)
         ... {
             if  (bDragging)
             ... {
                Point oMoveToPoint;
                oMoveToPoint  =   this .PointToClient(pictureBox1.PointToScreen( new  Point(e.X, e.Y)));
                oMoveToPoint.Offset(pClicked.X  *   - 1 , pClicked.Y  *   - 1 );
                pictureBox1.Location  =  oMoveToPoint;
            }
        }
         private   void  pictureBox1_MouseUp( object  sender, MouseEventArgs e)
         ... {
            bDragging  =   false ;
             this .pictureBox1.Cursor  =  curUp;
        }
    }
}