GirdView学习之三排序

要先设置GridView的AllowSortring=true,这样当点击列标题的时候才能激发GridView的Sorting事件进行排序

 1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Collections;
 5using System.Web;
 6using System.Web.Security;
 7using System.Web.UI;
 8using System.Web.UI.WebControls;
 9using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;

public partial class GridViewSortingTest : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ClientInfoAccessObj accessor = new ClientInfoAccessObj();
            GridView1.DataSource = accessor.GetAllClients();//绑定所有客户信息
            GridView1.DataBind();
        }
    }
    //按照客户姓名进行排序比较
    public int CompareByClientName(ClientInfo Client1, ClientInfo Client2)
    {
        return Client1.ClientName.CompareTo(Client2.ClientName);
    }

    //按照邮编和地址进行排序比较
    public int CompareByPostCodeAndAddressStr(ClientInfo client1, ClientInfo client2)
    {
        int ret = client1.PostCode.CompareTo(client2.PostCode);
        if (ret != 0)
            return ret;
        else//如果邮编一样
        {
            return client1.AddressStr.CompareTo(client2.AddressStr);
        }
    }
    //按照邮编进行排序比较
    public int CompareByPostCode(ClientInfo client1, ClientInfo client2)
    {
        return client1.PostCode.CompareTo(client2.PostCode);
    }
    //正在排序的事件
    protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
    {
        ClientInfoAccessObj accessor = new ClientInfoAccessObj();
        List<ClientInfo> clients = accessor.GetAllClients();
        switch (e.SortExpression)
        {
            case "ClientName":
                clients.Sort(CompareByClientName);//参数是一个Comparison<T>类型的泛型委托的函数名
                break;
            case "MultiColumnSort":
                clients.Sort(CompareByPostCodeAndAddressStr);
                break;
            case "PostCode":
                clients.Sort(CompareByPostCode);
                break;
            default:
                ClientScript.RegisterClientScriptBlock(this.GetType(), "InfoMsg", "alert('不支持对此字段进行排序');", true);
                break;
        }
        GridView1.DataSource = clients;//绑定显示数据
        GridView1.DataBind();
    }
    protected void btnSortByName_Click(object sender, EventArgs e)
    {
        GridView1.Sort("ClientName", SortDirection.Ascending);//此事件执行完毕再执行Sorting事件
    }
    protected void btnSortByPostCodeAndAddress_Click(object sender, EventArgs e)
    {
        GridView1.Sort("MultiColumnSort", SortDirection.Ascending);
    }
}