Repeater排序

1. repeater

   <asp:Repeater ID="rptGroups" runat="server" OnItemDataBound="rptGroups_ItemDataBound" OnItemCommand="rptGroups_ItemCommand">

2. rd

   <td>
                                   <asp:LinkButton ID="lbname" Runat="server" text="名称" CommandName="lbname"></asp:LinkButton>
                               </td>
                               <td>
                                   <asp:LinkButton ID="lbdate" Runat="server" text="时间" CommandName="lbdate"></asp:LinkButton>
                               </td>
                               <td>
                                   <asp:LinkButton ID="lbdays" Runat="server" text="天数" CommandName="lbdays"></asp:LinkButton>
                               </td>

3. ItemDataBound

       protected void rptGroups_ItemDataBound(object sender, RepeaterItemEventArgs e)
       {
           if (e.Item.ItemType == ListItemType.Header)
           {
               if (ViewState["id"] != null)
               {
                   LinkButton lkbtnSort = (LinkButton)e.Item.FindControl(ViewState["id"].ToString().Trim());
                   lkbtnSort.Text = ViewState["text"].ToString();
               }
           }
       }

4. ItemCommand

       protected void rptGroups_ItemCommand(object source, RepeaterCommandEventArgs e)
       {
           if (e.Item.ItemType == ListItemType.Header)
           {
               LinkButton lkbtnSort = (LinkButton)e.Item.FindControl(e.CommandName.Trim());
               if (ViewState[e.CommandName.Trim()] == null)
               {
                   ViewState[e.CommandName.Trim()] = "ASC";
                   lkbtnSort.Text = lkbtnSort.Text + "↑";
               }
               else
               {
                   if (ViewState[e.CommandName.Trim()].ToString().Trim() == "ASC")
                   {
                       ViewState[e.CommandName.Trim()] = "DESC";
                       if (lkbtnSort.Text.IndexOf("↑") != -1)
                           lkbtnSort.Text = lkbtnSort.Text.Replace("↑", "↓");
                       else
                           lkbtnSort.Text = lkbtnSort.Text + "↓";
                   }
                   else
                   {
                       ViewState[e.CommandName.Trim()] = "ASC";
                       if (lkbtnSort.Text.IndexOf("↓") != -1)
                           lkbtnSort.Text = lkbtnSort.Text.Trim().Replace("↓", "↑");
                       else
                           lkbtnSort.Text = lkbtnSort.Text + "↑";
                   }
               }
               ViewState["text"] = lkbtnSort.Text;
               ViewState["id"] = e.CommandName.Trim();
               IList<Model.DJ_TourGroup> tglist = (IList<Model.DJ_TourGroup>)rptGroups.DataSource;
               switch (e.CommandName.Trim())
               {
                   case "lbname":
                       if (ViewState[e.CommandName.Trim()].ToString().Trim() == "ASC")
                           tglist = tglist.OrderBy(x => x.Name).ToList();
                       else
                           tglist = tglist.OrderByDescending(x => x.Name).ToList();
                       break;
                   case "lbdate":
                       if (ViewState[e.CommandName.Trim()].ToString().Trim() == "ASC")
                           tglist = tglist.OrderBy(x => x.BeginDate).ToList();
                       else
                           tglist = tglist.OrderByDescending(x => x.BeginDate).ToList();
                       break;
                   case "lbdays":
                       if (ViewState[e.CommandName.Trim()].ToString().Trim() == "ASC")
                           tglist = tglist.OrderBy(x => x.DaysAmount).ToList();
                       else
                           tglist = tglist.OrderByDescending(x => x.DaysAmount).ToList();
                       break;
               }
               rptGroups.DataSource = tglist;
               rptGroups.DataBind();
           }
       }