怎样通过拖拽来改变无标题窗体的大小

Question

我写了一个无标题的窗体已经可以拖动了，
但是怎样才能通过拖拽来改变无标题窗体的大小。

Answer 1

http://www.microsoft.com/china/community/Column/60.mspx

Answer 2

就三个事件．
bord用于记录是那个边被选中．
 private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (beginsiae)
            {
               
                 if((bord&1)!=0)
              
                        if ((this.Height + currentY - MousePosition.Y) > 20)
                        {
                            this.Height = this.Height + currentY - MousePosition.Y;
                            this.Top = this.Top + MousePosition.Y - currentY;
                           
                        }
               
                        
                  if((bord&2)!=0)
                     if ((this.Width + MousePosition.X - currentX) > 20)
                       this.Width = this.Width + MousePosition.X - currentX;
                                      if((bord&4)!=0)
                     if ((this.Height + MousePosition.Y - currentY) > 20)
                        this.Height = this.Height + MousePosition.Y - currentY;
                           
                if((bord&8)!=0)
                    if ((this.Width + currentX - MousePosition.X) > 20)
                    {
                        this.Width = this.Width + currentX - MousePosition.X;
                        this.Left=this.Left+MousePosition.X-currentX;                    }
                      
                currentX=MousePosition.X;
                currentY=MousePosition.Y;            }
            else
            {
                if (Math.Abs(this.Location.X - MousePosition.X) < 10)
                    bord = bord | 8;
                else
                    bord = bord & 7;                if (Math.Abs(this.Location.X + this.Width - MousePosition.X) < 10)
                    bord = bord | 2;
                else
                    bord = bord & 13;                if (Math.Abs(this.Location.Y - MousePosition.Y) < 10)
                    bord = bord | 1;
                else
                    bord = bord & 14;                if (Math.Abs(this.Location.Y + this.Height - MousePosition.Y) < 10)
                    bord = bord | 4;
                else
                    bord = bord & 11;
                switch (bord)
                {
                    case 1:
                    case 4:
                        this.Cursor = Cursors.SizeNS;
                        break;
                    case 2:
                    case 8:
                        this.Cursor = Cursors.SizeWE;
                        break;
                    case 3:
                    case 12:
                        this.Cursor = Cursors.SizeNESW;
                        break;
                    case 9:
                    case 6:
                        this.Cursor = Cursors.SizeNWSE;
                        break;
                    default:
                        this.Cursor = Cursors.Default;
                        break;
                }
            }        }        int currentX = 0;
        int currentY = 0;
        bool beginsiae = false;
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (bord==0)
                return;
            else
            {
                currentX = MousePosition.X;
                currentY = MousePosition.Y;
                beginsiae = true;
            }        }        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            beginsiae = false;
            bord = 0;
            currentX = 0;
            currentY = 0;
        }