将DataGrid中满足条件的行设为不同的背景色(WinForm).

答案：由于项目需要, 需要对DataGrid的数据行， 按不同的条件以不同的背景色相区别。 由于DataGrid中没有相关的属性和方法可以直接设置，要完成这个功能还挺费些功夫。在网上搜了半天，也没找到解决方案。只好自己动手，丰衣足食了，:) 。研究了半天, 终于搞定它了。好东西不敢独享，特贴出来，希望能给需要的人带来些帮助。



{

//...

//使用DataGridTableStyle 显示DataGrid.

   DataGridTableStyle tableStyle = new DataGridTableStyle();
   tableStyle.MappingName = "customers";

   int numCols = _dataSet.Tables["customers"].Columns.Count;
   DataGridCellColorTextBoxColumn columnTextColumn ;
   for(int i = 0; i < numCols; ++i)
   {
    columnTextColumn = new DataGridCellColorTextBoxColumn();
    columnTextColumn.HeaderText = _dataSet.Tables["customers"].Columns[i].ColumnName;
    columnTextColumn.MappingName = _dataSet.Tables["customers"].Columns[i].ColumnName;

    //为每个单元格建立设置背景色的事件.
    columnTextColumn.CheckCellColor += new CellColorEventHandler(SetColorValues);

    tableStyle.GridColumnStyles.Add(columnTextColumn);
   }
   
   dataGrid1.TableStyles.Clear();
   dataGrid1.TableStyles.Add(tableStyle);

   dataGrid1.DataSource = _dataSet.Tables["customers"];

}

 

  public void SetColorValues(object sender, DataGridCellColorEventArgs e)
  {
   //根据条件, 将相关行设置不同的背景色.
   //下例为国家(datagrid中第9列)为Mexico的行设置为红色,USA的行设为黄色.
   if(Convert.ToString(dataGrid1[e.Row,8]) == "Mexico")
    e.BackColor = Color.Red;
   else if(Convert.ToString(dataGrid1[e.Row,8]) == "USA")
    e.BackColor = Color.Yellow;
  }


 public class DataGridCellColorEventArgs : EventArgs
 {
  private int _row;
  private Color _backcolor;

  public DataGridCellColorEventArgs(int row, Color val)
  {
   _row = row;
   _backcolor = val;
  }
  public int Row
  {
   get{ return _row;}
   set{ _row = value;}
  }
  public Color BackColor
  {
   get{ return _backcolor;}
   set{ _backcolor = value;}
  }
 }

 

 //为事件建立委托.
 public delegate void CellColorEventHandler(object sender, DataGridCellColorEventArgs e);

 public class DataGridCellColorTextBoxColumn : DataGridTextBoxColumn
 {
  public event CellColorEventHandler CheckCellColor;

  public DataGridCellColorTextBoxColumn()
  {
  }

  //继承DataGridTextBoxColumn的Pain事件.
  protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle bounds, System.Windows.Forms.CurrencyManager source, int rowNum, System.Drawing.Brush backBrush, System.Drawing.Brush foreBrush, bool alignToRight)
  {
   if(CheckCellColor != null)
   {
    //重绘画时,设置当前行的背景色
    DataGridCellColorEventArgs e = new DataGridCellColorEventArgs(rowNum, Color.White);
    CheckCellColor(this, e);
    
    if(e.BackColor != Color.White)
     backBrush = new SolidBrush(e.BackColor);
   }

   base.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight);
  }

  protected override void Edit(System.Windows.Forms.CurrencyManager source, int rowNum, System.Drawing.Rectangle bounds, bool readOnly, string instantText, bool cellIsVisible)
  {
   base.Edit(source, rowNum, bounds, readOnly, instantText, cellIsVisible);
  }
 }

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