实用技巧：datagrid的正反双向排序

if (!ispostback)  {    if(this.kjkm_dg.attributes["sortexpression"]==null) //这里kjkm_dg为datagrid   id    {     this.kjkm_dg.attributes["sortexpression"]="kmdm";  //这里给datagrid增加一个排序属性，且默认排序表达式为kmdm;     kjkm_dg.attributes["sortdirection"]="asc"; //这里给datagrid增加一个排序方向属性,且默认为升序排列;    }    mikecatbind(); //绑定函数,下面介绍  }   protected void mikecatbind()  {   string sqlstr="select * from zc_kjkm";   dataview dv=new dataview();      string sortexpression=kjkm_dg.attributes["sortexpression"];   string sortdirection=kjkm_dg.attributes["sortdirection"];   dv=us.bind(sqlstr).tables[0].defaultview;  //来自web service的dataset,这里随便一个ds就可以;   dv.sort=sortexpression+" "+sortdirection; //指定视图的排序方式;   kjkm_dg.datasource=dv; //指定数据源   kjkm_dg.databind(); //数据绑定  }

private void kjkm_dg_sortcommand(object source, system.web.ui.webcontrols.datagridsortcommandeventargs e)  {   string sortexpression=e.sortexpression.tostring();  //获得当前排序表达式   string sortdirection="asc"; //为排序方向变量赋初值   if(sortexpression==kjkm_dg.attributes   ["sortexpression"])  //如果为当前排序列   {    sortdirection=(kjkm_dg.attributes["sortdirection"].tostring()==sortdirection?"desc":"asc");     //获得下一次的排序状态   }   kjkm_dg.attributes["sortexpression"]=sortexpression;   kjkm_dg.attributes["sortdirection"]=sortdirection;   mikecatbind();  }