topiclist.aspx.cs

c# 李子全集 初学者的法宝 文档全集

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

using MyBBS.BusinessLogicLayer;

namespace MyBBS.Web
{
    /// <summary>
    /// TopicList 的摘要说明。
    /// </summary>
    public partial class TopicList : System.Web.UI.Page
    {
        /// <summary>
        /// 页面加载事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Page_Load(object sender, System.EventArgs e)
        {
            if (!CheckUser())
                Response.Redirect("Login.aspx");

            InitData();
        }

        #region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }

        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
        }
        #endregion

        /// <summary>
        /// 验证用户身份
        /// </summary>
        /// <returns></returns>
        private bool CheckUser()
        {
            if (Session["login_name"] == null)
            {
                Response.Write("<Script Language=JavaScript>alert('请登录！');</Script>");
                return false;
            }
            return true;
        }

        /// <summary>
        /// 按时间降序，读取帖子数据
        /// </summary>
        private void InitData()
        {
            DataSet ds = Topic.QueryTopics();
            GV.DataSource = ds;
            GV.DataBind();
            LabelPages.Text = "查询结果（第" + (GV.PageIndex + 1).ToString() + "页 共" + GV.PageCount.ToString() + "页）";
        }

        /// <summary>
        /// 按钮列单击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void GV_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            int index = Convert.ToInt32(e.CommandArgument); //待处理的行下标
            int topicId = -1;
            
            switch (e.CommandName)
            {
                //修改
                case "Update":
                    topicId = Convert.ToInt32(GV.Rows[index].Cells[0].Text);
                    Response.Redirect("TopicUpdate.aspx?topic_id=" + topicId);
                    break;

                //删除
                case "Delete":
                    topicId = Convert.ToInt32(GV.Rows[index].Cells[0].Text);
                    Topic topic = new Topic();
                    topic.LoadData(topicId);
                    topic.Delete();
                    break;

                default:
                    break;
            }
        }

        /// <summary>
        /// 翻页事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void GV_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            GV.PageIndex = e.NewPageIndex;
            InitData();
        }

        /// <summary>
        /// 删除前事件，检测用户是否有删除该数据的权限
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void GV_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string userLoginNameOfTopic = GV.Rows[e.RowIndex].Cells[1].Text.ToString(); //UserLoginName
            if (userLoginNameOfTopic == "guest" || userLoginNameOfTopic != Session["login_name"].ToString())
            {
                Response.Write("<Script Language=JavaScript>alert('您无权删除！');</Script>");
                e.Cancel = true;
            }
        }

        /// <summary>
        /// 修改前事件，检测用户是否有修改该数据的权限
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void GV_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            string userLoginNameOfTopic = GV.Rows[e.RowIndex].Cells[1].Text.ToString();
            if (userLoginNameOfTopic == "guest" || userLoginNameOfTopic != Session["login_name"].ToString())
            {
                Response.Write("<Script Language=JavaScript>alert('您无权修改！');</Script>");
                e.Cancel = true;
            }
        }
    }
}