GridView自动排序
GridView自带了数据排序功能。在设计视图下,只能对GridView的排序数据列和排序方向进行静态设置。在后台程序中,则需要用Attributes方式对GridView的这两个属性进行动态设置。
示例如下:
(前台)
需要对GridView启用AllowSorting、设置OnSorting事件,对需要排序的列设定SortExpression属性。
(后台)
示例如下:
(前台)
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>无标题页</title> </head> <body> <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" AllowSorting="True" OnSorting="GridView1_Sorting"> <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> <RowStyle BackColor="#EFF3FB" /> <Columns> <asp:BoundField DataField="id" HeaderText="ID" SortExpression="id" /> <asp:BoundField DataField="name" HeaderText="NAME" SortExpression="name" /> <asp:BoundField DataField="age" HeaderText="AGE" SortExpression="age" /> </Columns> <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" /> <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" /> <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> <EditRowStyle BackColor="#2461BF" /> <AlternatingRowStyle BackColor="White" /> </asp:GridView> </div> </form> </body> </html>前台注意点:
需要对GridView启用AllowSorting、设置OnSorting事件,对需要排序的列设定SortExpression属性。
(后台)
using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { // 设定初始排序参数值 // 错误的属性设置方法:SortExpression、SortDirection均是GridView只读属性,无法直接赋值。 //this.GridView1.SortExpression = "id"; //this.GridView1.SortDirection = "ASC"; // 正确的属性设置方法 this.GridView1.Attributes.Add("SortExpression", "id"); this.GridView1.Attributes.Add("SortDirection", "ASC"); // 绑定数据源到GridView this.BindGridView(); } } /// <summary> /// GridView排序事件 /// </summary> protected void GridView1_Sorting(object sender, GridViewSortEventArgs e) { // 从事件参数获取排序数据列 string sortExpression = e.SortExpression.ToString(); // 假定为排序方向为“顺序” string sortDirection = "ASC"; // “ASC”与事件参数获取到的排序方向进行比较,进行GridView排序方向参数的修改 if (sortExpression == this.GridView1.Attributes["SortExpression"]) { //获得下一次的排序状态 sortDirection = (this.GridView1.Attributes["SortDirection"].ToString() == sortDirection ? "DESC" : "ASC"); } // 重新设定GridView排序数据列及排序方向 this.GridView1.Attributes["SortExpression"] = sortExpression; this.GridView1.Attributes["SortDirection"] = sortDirection; this.BindGridView(); } /// <summary> /// 绑定到GridView /// </summary> private void BindGridView() { // 获取GridView排序数据列及排序方向 string sortExpression = this.GridView1.Attributes["SortExpression"]; string sortDirection = this.GridView1.Attributes["SortDirection"]; // 调用业务数据获取方法 DataTable dtBind = this.getDB(); // 根据GridView排序数据列及排序方向设置显示的默认数据视图 if ((!string.IsNullOrEmpty(sortExpression)) && (!string.IsNullOrEmpty(sortDirection))) { dtBind.DefaultView.Sort = string.Format("{0} {1}", sortExpression, sortDirection); } // GridView绑定并显示数据 this.GridView1.DataSource = dtBind; this.GridView1.DataBind(); } /// <summary> /// 获取数据源的方法 /// </summary> /// <returns>数据源</returns> private DataTable getDB() { DataTable dt = new DataTable(); dt.Columns.Add("id"); dt.Columns.Add("name"); dt.Columns.Add("age"); dt.Rows.Add(new object[] { "000001", "hekui", "26" }); dt.Rows.Add(new object[] { "000002", "zhangyu", "26" }); dt.Rows.Add(new object[] { "000003", "zhukundian", "27" }); dt.Rows.Add(new object[] { "000004", "liyang", "25" }); dt.Rows.Add(new object[] { "000005", "caili", "27" }); return dt; } }