DataGridColoredTextBoxColumn 改变datagrid 某一特定单元格颜色

最新推荐文章于 2022-03-30 15:35:12 发布

原创最新推荐文章于 2022-03-30 15:35:12 发布 · 1.3k 阅读

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本文介绍了如何使用DataGridColoredTextBoxColumn类来实现数据网格中某一特定单元格的颜色变化，通过定制控件和绑定数据集，达到高亮显示数据的目的。

public class DataGridColoredTextBoxColumn : DataGridTextBoxColumn
{
  private System.Data.DataRow[] m_coloredDataRows;
  private System.Drawing.Brush m_foreBrush;
  private System.Drawing.Brush m_backBrush;
  //设置行色彩
  public void SetRowsColor(DataRow[] aDataRows)
  {
   //设置要改变颜色的行
   m_coloredDataRows = aDataRows;
   //设置前景色
   m_foreBrush = new SolidBrush(Color.White);
   //设置背景色
   m_backBrush = new SolidBrush(Color.OliveDrab);
  }
  //设置行色彩
  public void SetRowsColor(DataRow[] aDataRows,Color forecolor,Color backcolor)
  {
   //设置要改变颜色的行
   m_coloredDataRows = aDataRows;
   //设置前景色
   m_foreBrush = new SolidBrush(forecolor);
   //设置背景色
   m_backBrush = new SolidBrush(backcolor);
  }
  //设置行色彩
  public void SetRowsColor(DataRow[] aDataRows, System.Drawing.Brush aForeBrush, System.Drawing.Brush aBackBrush)
  {
   //设置要改变颜色的行
   m_coloredDataRows = aDataRows;
   //设置前景色
   m_foreBrush = aForeBrush;
   //设置背景色
   m_backBrush = aBackBrush;
  }
  //重载绘制单元格的函数,如果该单元格所在行符合ColoredView中的条件,就改变前景和背景色
  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)
  {
   //获取当前正在显示的DataView
   DataView currentView;
   Type iType = this.DataGridTableStyle.DataGrid.DataSource.GetType();
   if (iType==typeof(System.Data.DataView) )
    currentView = (DataView)(this.DataGridTableStyle.DataGrid.DataSource);
   else if (iType==typeof(System.Data.DataTable) )
    currentView = ((DataTable)(this.DataGridTableStyle.DataGrid.DataSource)).DefaultView;
   else if (iType==typeof(System.Data.DataSet) )
    currentView = ((DataSet)(this.DataGridTableStyle.DataGrid.DataSource)).Tables[this.DataGridTableStyle.MappingName].DefaultView;
   else if (iType==typeof(System.Data.DataViewManager) )
   {
    DataViewManager viewManager = (DataViewManager)(this.DataGridTableStyle.DataGrid.DataSource);
    currentView = viewManager.DataSet.Tables[this.DataGridTableStyle.MappingName].DefaultView;
   }
   else
   { //如果dataSource不符合以上四种类型(应该不会吧^_^),抛出系统错误
    throw(new SystemException());
   }
   //搜索当前行是否在设置行色彩的ColoredView当中
   DataRow currentRow = currentView[rowNum].Row;
   foreach (DataRow coloredRow in m_coloredDataRows)
   {
    if (currentRow == coloredRow)
    {
     backBrush = m_backBrush;
     foreBrush = m_foreBrush;
     break;
    }
   }
   //调用基类的绘制函数
   base.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight);
  }

}