『转载』C# winform 中dataGridView的重绘（进度条，虚线，单元格合并等）

原文转载自：http://hi.baidu.com/suming/item/81e45b1ab9b4585f2a3e2243

最近比较浅的研究了一下dataGridView的重绘，发现里面还是有很多东西可以学习的，摘录如下（其实就是在dataGridView1_CellPainting写一些代码）

主要代码：

   int top = 0;
   int left = 0;
   int height = 0;
   int width1 = 0;
   /// <summary>
   /// 窗体的重绘事件
   /// </summary>
   /// <param name="sender"></param>
   /// <param name="e"></param>
   private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
   {
       /** 表头处理*************************************/
       if (e.RowIndex == -1)
       {
           if (e.ColumnIndex == 0 || e.ColumnIndex == 1 || e.ColumnIndex == 2 || e.ColumnIndex == 3 || e.ColumnIndex == 4 || e.ColumnIndex == 5)
           {
               top = e.CellBounds.Top;
               left = e.CellBounds.Left - 1;
               height = e.CellBounds.Height;
               width1 = e.CellBounds.Width;
               Rectangle rect1 = new Rectangle(left, top, width1, e.CellBounds.Height);
               //表头第一列
               if (e.ColumnIndex == 0)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.Blue))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //表头第二列
               else if (e.ColumnIndex == 1)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.Orange))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //表头第三列
               else if (e.ColumnIndex == 2)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.Orange))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //表头第四列
               else if (e.ColumnIndex == 3)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.Orange))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //表头第五列
               else if (e.ColumnIndex == 4)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.Blue))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //表头第六列
               else if (e.ColumnIndex == 5)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.Blue))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               using (Pen gridLinePen = new Pen(Color.Green , 1))
               {
                   //绘出上线
                   e.Graphics.DrawLine(gridLinePen, left, top, left + width1, top);
                   //绘出下线
                   e.Graphics.DrawLine(gridLinePen, left, top + height, left + width1, top + height);
                   //绘出左线
                   e.Graphics.DrawLine(gridLinePen, left, top, left, top + height);
                   string columnValue = "";
                   //计算绘制字符串的位置
                   if (e.ColumnIndex == 0)
                   {
                       columnValue = "零件号";
                   }
                   else if (e.ColumnIndex == 1)
                   {
                       columnValue = "8:00--11:59";
                   }
                   else if (e.ColumnIndex == 2)
                   {
                       columnValue = "12:00--16:59";
                   }
                   else if (e.ColumnIndex == 3)
                   {
                       columnValue = "18:00--30:59";
                   }
                   else if (e.ColumnIndex == 4)
                   {
                       columnValue = "进度";
                   }
                   else if (e.ColumnIndex == 5)
                   {
                       columnValue = "进度率";
                   }
                   SizeF sf = e.Graphics.MeasureString(columnValue, e.CellStyle.Font);
                   float lstr = (width1 - sf.Width) / 2;
                   //float rstr = sf.Height/2;
                   float rstr = (height - sf.Height) / 2;
                   //画出文本框
  
                   if (columnValue != "")
                   {
                       e.Graphics.DrawString(columnValue, e.CellStyle.Font,
                                                  new SolidBrush(Color.White),
                                                    left + lstr,
                                                    top + rstr,
                                                    StringFormat.GenericDefault);
                   }
               }
               e.Handled = true;
           }
  
       }
        /** 内容处理*************************************/
       else
       {
           if (e.ColumnIndex == 0 || e.ColumnIndex == 1 || e.ColumnIndex == 2 || e.ColumnIndex == 3 || e.ColumnIndex == 4 || e.ColumnIndex == 5)
           {
               top = e.CellBounds.Top;
               left = e.CellBounds.Left - 1;
               height = e.CellBounds.Height;
               width1 = e.CellBounds.Width;
               Rectangle rect1 = new Rectangle(left, top, width1, e.CellBounds.Height);
               //内容第一列
               if (e.ColumnIndex == 0)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.LightGreen))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //内容第二列
               else if (e.ColumnIndex == 1)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.White))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //内容第三列
               else if (e.ColumnIndex == 2)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.White))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //内容第四列
               else if (e.ColumnIndex == 3)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.White))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //内容第五列
               else if (e.ColumnIndex == 4)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.LightGreen))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               //内容第六列
               else if (e.ColumnIndex == 5)
               {
                   using (Brush backColorBrush = new SolidBrush(Color.LightGreen))
                   {
                       //抹去原来的cell背景
                       e.Graphics.FillRectangle(backColorBrush, rect1);
                   }
               }
               using (Pen gridLinePen = new Pen(Color.Green, 1))
               {
                   //绘出左线
                   e.Graphics.DrawLine(gridLinePen, left, top, left, top + height);
                    
               }
               //绘出进度率的线
               if (e.ColumnIndex == 1 || e.ColumnIndex == 2 || e.ColumnIndex == 3)
               {
                   string str = e.Value.ToString();
                   int index =str.LastIndexOf ("/");
                   int widths = Convert.ToInt32(Convert.ToDouble(str.Substring(0, index)) / Convert.ToDouble(str.Substring(index + 1)) * width1);
                   if (widths > width1)
                   {
                       widths = width1;
                   }
                   using (Pen gridLinePen = new Pen(Color.Blue, Convert.ToInt32(height / 3)))
                   {
  
                       e.Graphics.DrawLine(gridLinePen, left, top + height / 2 + Convert.ToInt32(height / 3), left + widths, top + height / 2 + Convert.ToInt32(height /3));
  
                   }
               }  
               //画出上下线，中线和单元格的数据
               using (Pen gridLinePen = new Pen(Color.Green , 1))
               {
                   float[] BlueValues = { 1, 1,1, 1 };
                   gridLinePen.DashPattern = BlueValues;
                   //绘出上线
                   e.Graphics.DrawLine(gridLinePen, left, top, left + width1, top);
                   //绘出下线
                   e.Graphics.DrawLine(gridLinePen, left, top + height, left + width1, top + height);
                   if (e.ColumnIndex == 1 || e.ColumnIndex == 2 || e.ColumnIndex == 3)
                   {                          
  
                       //绘出中线
                       e.Graphics.DrawLine(gridLinePen, left, top + height / 2, left + width1, top + height / 2);
                       e.Graphics.DrawLine(gridLinePen, left + width1/4, top + height / 2, left + width1/4, top + height);
                       e.Graphics.DrawLine(gridLinePen, left + width1 / 2, top + height / 2, left + width1 / 2, top + height);
                       e.Graphics.DrawLine(gridLinePen, left + width1*3 / 4, top + height / 2, left + width1*3 / 4, top + height);
                   }                       
                      
                   string columnValue =e.Value.ToString () ;
                   SizeF sf = e.Graphics.MeasureString(columnValue, e.CellStyle.Font);
                   float lstr = (width1 - sf.Width) / 2;
                   //float rstr = sf.Height/2;
                   float rstr = (height/2 - sf.Height) / 2;
                   //画出文本框数据
                   if (columnValue != "")
                   {
                       e.Graphics.DrawString(columnValue, e.CellStyle.Font,
                                                  new SolidBrush(Color.Black),
                                                    left + lstr,
                                                    top + rstr,
                                                    StringFormat.GenericDefault);
                   }
               }
               e.Handled = true;
           }
       }
   }

例图如下：