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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();
        }
    }

    ///
    /// GridView排序事件
    ///
    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();
    }

    ///
    /// 绑定到GridView
    ///
    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();
    }

    ///
    /// 获取数据源的方法
    ///
    /// 数据源
    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;
    }
}