使用UltraWebGrid排序需注意的几处

本文主要是介绍使用UltraWebGrid排序需注意的几处，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

以下是公共函数，适用于以下三种各处

      private void BindData(UltraWebGrid pUwg, string sort)
     {
         DataSet ds = new DataSet("ds_dry");
         DataTable dt = new DataTable("dt_dry");
         dt.Columns.Add(new DataColumn("num", typeof(int)));

         DataRow dr = null;
         for (int i = 0; i < 20; i++)
         {
             dr = dt.NewRow();
             dr["num"] = i;
             dt.Rows.Add(dr);
         }
         ds.Tables.Add(dt);

         if (sort != null && sort != "")
         {
             DataView dv = ds.Tables[0].DefaultView;
             dv.Sort = sort;
             pUwg.DataSource = dv;
             pUwg.DataBind();
         }
         else
         {
             pUwg.DataSource = ds;
             pUwg.DataBind();
         }

         foreach (UltraGridColumn ugc in pUwg.Columns)
         {
             ugc.AllowRowFiltering = false;
         }
     }

 

protected void UltraWebGrid1_PageIndexChanged(object sender, Infragistics.WebUI.UltraWebGrid.PageEventArgs e)
      {
          this.uwg1.DisplayLayout.Pager.CurrentPageIndex = e.NewPageIndex;
          BindData(this.uwg1, null);
      }

以下的分页和排序都可以用

1.使用默认提供的排序方式，以下必须要留意。

UltraWebGrid.DisplayLayout.EnableInternalRowsManagement = true;//如果不设置为true,排序几次之后分页就会有问题。

UltraWebGrid_SortColumn可以没有具体的处理代码。

关键代码如下

protected void Page_Load(object sender, EventArgs e)
{
       uwg1 = UltraWebGrid1;
       if (!this.IsPostBack)//注意只要做一次。
       {
            SetStyle();
            uwg1.SortColumn += new SortColumnEventHandler(JeezWebGrid_SortColumn);
            uwg1.PageIndexChanged += new PageIndexChangedEventHandler(UltraWebGrid1_PageIndexChanged);
            BindData(uwg1, null);

        }
}

 

2.动态创建的UltraWebGrid使用默认排序，以下必须留意

protected void Page_Load(object sender, EventArgs e)
{
       uwg1 = new UltraWebGrid();
       //if (!this.IsPostBack)//去掉判断，每次都做。
       //{
            SetStyle();
            uwg1.SortColumn += new SortColumnEventHandler(JeezWebGrid_SortColumn);
            uwg1.PageIndexChanged += new PageIndexChangedEventHandler(UltraWebGrid1_PageIndexChanged);
          if(!this.IsPostBack) //这一句可以加上判断，也可以不加，应为后面的DataBind()方法会把这个覆盖)
            BindData(uwg1, null);
        //}
       this.form1.Controls.Add(uwg1);
}

3.动态创建的UltraWebGrid使用自定义排序，以下必须留意

       protected void Page_Load(object sender, EventArgs e)
       {
           uwg1 = new UltraWebGrid();
           SetStyle();
           uwg1.SortColumn += new SortColumnEventHandler(JeezWebGrid_SortColumn);
           uwg1.PageIndexChanged += new PageIndexChangedEventHandler(UltraWebGrid1_PageIndexChanged);
           //if (!this.IsPostBack)
               BindData(uwg1, null);
           this.form1.Controls.Add(uwg1);
       }

      uwg1.DisplayLayout.EnableInternalRowsManagement = false;

     protected void JeezWebGrid_SortColumn(object sender, Infragistics.WebUI.UltraWebGrid.SortColumnEventArgs e)
      {
          UltraWebGrid uwg = sender as UltraWebGrid;
          SortIndicator si = SortIndicator.None;
          if (Session["sortDirection"] == null)
          {
              Session["sortDirection"] = "asc";
          }

          if (Session["sortDirection"].ToString() == "asc")
          {
              Session["sortDirection"] = "desc";
              si = SortIndicator.Descending;
          }
          else
          {
              Session["sortDirection"] = "asc";
              si = SortIndicator.Ascending;
          }
          e.Cancel = true;

          //turn off all sort icons in the headers
          for (int i = 0; i < uwg.DisplayLayout.Bands[0].Columns.Count; i++)
          {
              uwg.DisplayLayout.Bands[0].Columns[i].SortIndicator = Infragistics.WebUI.UltraWebGrid.SortIndicator.None;
          } 
         //以下两句至关重要
          ((UltraWebGrid)sender).DisplayLayout.Bands[0].Columns[e.ColumnNo].SortIndicator =si;
          BindData((UltraWebGrid)sender, this.uwg1.Columns[e.ColumnNo].Key + " " + Session["sortDirection"]);

      }

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