header.ascx.cs

投票系统模块设计

namespace book07
{
	using System;
	using System.Data;
	using System.Drawing;
	using System.Web;
	using System.Web.UI.WebControls;
	using System.Web.UI.HtmlControls;
	using System.Web.Security;
	using Business;
	using Common;

	/// <summary>
	///		Header 的摘要说明。
	/// </summary>
	public class Header : System.Web.UI.UserControl
	{
		protected System.Web.UI.WebControls.LinkButton lbLogout;
		protected System.Web.UI.WebControls.LinkButton lbReturn;
		protected System.Web.UI.WebControls.LinkButton lbNewPost;
		protected System.Web.UI.WebControls.LinkButton lbUserManage;
		protected System.Web.UI.WebControls.Label lblUser;
		protected System.Web.UI.WebControls.LinkButton lbDelete;
		protected System.Web.UI.WebControls.LinkButton lbLogin;

		#region Properties

		/// <summary>
		/// 用户名
		/// </summary>
		public string Username
		{
			get
			{
				return HttpContext.Current.User.Identity.Name;
			}
		}

		/// <summary>
		/// 是否登录
		/// </summary>
		public bool IsLogin
		{
			get
			{
				return HttpContext.Current.User.Identity.IsAuthenticated;
			}
		}

		/// <summary>
		/// 是否有权用户管理
		/// </summary>
		public bool CanUserManage
		{
			get
			{
				if (!IsLogin)
					return false;

				string strUsername = HttpContext.Current.User.Identity.Name;
				return Forum.CanUserManage(strUsername);
			}
		}

		private bool _show_delete;
		/// <summary>
		/// 是否显示删除文章按钮
		/// </summary>
		public bool ShowDelete
		{
			get
			{
				return _show_delete;
			}
			set
			{
				_show_delete = value;
			}
		}

		/// <summary>
		/// 是否有权删除文章
		/// </summary>
		public bool CanDelete
		{
			get
			{
				if (!IsLogin)
					return false;
				if (!Forum.CanDeleteArticle(Username))
					return false;
				return true;
			}
		}


		#endregion

		private void Page_Load(object sender, System.EventArgs e)
		{
			// 设置各个按钮是否可见
			lbLogout.Visible = IsLogin;
			lbNewPost.Visible = IsLogin;
			lbLogin.Visible = !IsLogin;
			lbUserManage.Visible = CanUserManage;
			lblUser.Text = "欢迎光临，" + Username + "!";
			lblUser.Visible = IsLogin;
			lbDelete.Visible = ShowDelete && CanDelete;
			if (lbDelete.Visible)
			{
				lbDelete.Attributes.Add("onclick",
					"return window.confirm('您确定要删除该文章及其所有回复吗？');");
			}

		}

		#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()
		{
			this.lbUserManage.Click += new System.EventHandler(this.lbUserManage_Click);
			this.lbNewPost.Click += new System.EventHandler(this.lbNewPost_Click);
			this.lbReturn.Click += new System.EventHandler(this.lbReturn_Click);
			this.lbLogin.Click += new System.EventHandler(this.lbLogin_Click);
			this.lbLogout.Click += new System.EventHandler(this.lbLogout_Click);
			this.lbDelete.Click += new System.EventHandler(this.lbDelete_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void lbLogin_Click(object sender, System.EventArgs e)
		{
			//转向登录页面
			Response.Redirect("~/Login.aspx");
		}

		private void lbLogout_Click(object sender, System.EventArgs e)
		{
			//注销
			FormsAuthentication.SignOut();
			Response.Redirect("~/Default.aspx");
		}

		private void lbReturn_Click(object sender, System.EventArgs e)
		{
			//返回主页面
			Response.Redirect("~/Default.aspx");
		}

		private void lbNewPost_Click(object sender, System.EventArgs e)
		{
			//转向发表新文章页面
			Response.Redirect("~/NewPost.aspx");
		}

		private void lbUserManage_Click(object sender, System.EventArgs e)
		{
			//转向用户管理页面
			Response.Redirect("~/UserManage.aspx");
		}

		private void lbDelete_Click(object sender, System.EventArgs e)
		{
			int id = Convert.ToInt32(Request.QueryString["id"]);
			if (Forum.DeleteArticle(id, Username))
			{
				Response.Redirect("~/Default.aspx");
			}
			else
			{
				Response.Write("<script>alert('删除文章失败！');</script>");
			}

		}
	}
}