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）
Code<%@ 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）
Codeusing 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;
}
}
