usersonline.aspx.cs

《圣殿祭司的ASP.NET 2.0开发详解——使用C#》光盘内容.包含了书籍所含的源代码.非常经典的一本asp.net2.0的书籍

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 UsersOnline : System.Web.UI.Page
{
	int pageSize = 5;	//一页显示五条数据
	int totalUsers;		//全部用户数
	int totalPages;		//总分页数
	int currentPage = 0;//目前所在分页

    protected void Page_Load(object sender, EventArgs e)
    {
		Response.Write("<Font Color='Blue'>用户Online时间为最近" + Membership.UserIsOnlineTimeWindow + "分钟内</Font>");
		if (!IsPostBack)
		{
			GetUsers();
		}
    }

	//统计目前在线用户
	private void GetUsers()
	{
		//显示目前在线用户人数
		txtUsersOnline.Text = Membership.GetNumberOfUsersOnline().ToString();

		//以分页显示用户
		gvOnlineUsers.DataSource = Membership.GetAllUsers(currentPage, pageSize, out totalUsers);
		gvOnlineUsers.DataBind();

		//计算总分页数
		totalPages = ((totalUsers - 1) / pageSize) + 1;
		int pageNo = currentPage + 1;
		txtCurrentPage.Text = pageNo.ToString();   //目前分页
		txtTotalPages.Text = totalPages.ToString();		//总分页数

		CheckNavigation();

	}

	//检查分页按钮状态
	private void CheckNavigation()
	{
		if (currentPage <= 0)
		{
			PreviousButton.Visible = false;
			return;
		}
		else
		{
			PreviousButton.Visible = true;
		}

		if (currentPage >= totalPages)
		{
			NextButton.Visible = false;
			return;
		}
		else
		{
			NextButton.Visible = true;
		}
	}

	//上一页
	protected void PreviousButton_Click(object sender, ImageClickEventArgs e)
	{
		currentPage = Convert.ToInt32(txtCurrentPage.Text);
		if (currentPage >= 1)
		{
			currentPage--;
		}
		GetUsers();
	}

	//下一页
	protected void NextButton_Click(object sender, ImageClickEventArgs e)
	{
		currentPage = Convert.ToInt32(txtCurrentPage.Text) - 1;
		if (currentPage < totalPages)
		{
			currentPage++;
		}
		GetUsers();
	}
}