asp.net GridView排序简单实现

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GridViewSort.aspx.cs" Inherits="GridViewSort" %>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 GridViewSort : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ViewState["SortOrder"] = "PID";
ViewState["OrderDire"] = "Desc";
Bind();
}
}
private void Bind()
{
gdvSort.AllowSorting = true;
DataView dv = getDt().DefaultView;
dv.Sort = (string)ViewState["SortOrder"] + " " + (string)ViewState["OrderDire"];
gdvSort.DataSource = dv;
gdvSort.DataBind();
}
///

/// 连数据库麻烦，直接构造一个DataTable
///

///
private DataTable getDt()
{
DataTable dt = new DataTable();
dt.Columns.Add("PID", typeof(System.Int32));
dt.Columns.Add("UserName", typeof(System.String));
for (int i = 0; i < 10; i++)
{
DataRow dr = dt.NewRow();
dr["PID"] = i;
dr["UserName"] = "姓名" + i;
dt.Rows.Add(dr);
}
return dt;
}
protected void gdvSort_Sorting(object sender, GridViewSortEventArgs e)
{
string sPage = e.SortExpression;
if (ViewState["SortOrder"].ToString() == sPage)
{
if (ViewState["OrderDire"].ToString() == "Desc")
{
ViewState["OrderDire"] = "Asc";
}
else
{
ViewState["OrderDire"] = "Desc";
}
}
else
ViewState["SortOrder"] = e.SortExpression;
Bind();
}
}