DataView的几种操作

       DataSet中的表DataTable的页面显示不直接由DataTable提供，而是由DataView提供，DataTable不支持数据的筛选，而DataView可以。
下面看个小例子：

//默认显示
     void ViewData(DataTable dt)
     {
         DataView dv = new DataView(dt);
         //或者DataView dv=dt.DataView();
         this.DataList1.DataSource = dv;
         this.DataList1.DataBind();
     }

     //倒序显示
     void ViewData_Sort(DataTable dt)
     {
         DataView dv = new DataView();
         dv.Table = dt;
         dv.Sort = "UserID DESC";
         this.DataList1.DataSource = dv;
         this.DataList1.DataBind();
     }

     //字符长度筛选控制显示
     void ViewData_Len(DataTable dt)
     {
         DataView dv = new DataView();
         dv.Table = dt;
         dv.RowFilter = "Len(title)>4";
         this.DataList1.DataSource = dv;
         this.DataList1.DataBind();
     }

     //字符类似筛选控制显示
     void ViewData_Like(DataTable dt)
     {
         DataView dv = new DataView();
         dv.Table = dt;
         dv.RowFilter = "Address like '%北京%'";
         this.DataList1.DataSource = dv;
         this.DataList1.DataBind();
     }

     //多个筛选控制显示
     void ViewData_More_Like(DataTable dt)
     {
         DataView dv = new DataView();
         dv.Table = dt;
         dv.RowFilter = "Address like '%北京%'";
         this.DataList1.DataSource = dv;
         this.DataList1.DataBind();
     }