应用程序状态_例1.txt

C# 是创新性的新式编程语言

1.WebForm1.aspx

private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
			Application.Lock();
			int count=(int)Application["count"]+1;
			Application["count"]=count;
			Application.UnLock();
			this.Label1.Text="Page in this application have been requested."+count+"time";
			if(count>1)
				this.Label1.Text+="s";
			else
				this.Label1.Text+=".";
		}

2.Global.asax.cs
using System;
using System.Collections;
using System.ComponentModel;
using System.Web;
using System.Web.SessionState;
using System.IO;
namespace MyAppCounter 
{
	/// <summary>
	/// Global 的摘要说明。
	/// </summary>
	public class Global : System.Web.HttpApplication
	{
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.IContainer components = null;
		private static string _path;
		private static string _logpath;

		public Global()
		{
			InitializeComponent();
		}	
		
		protected void Application_Start(Object sender, EventArgs e)
		{
			StreamReader reader = null;

			try 
			{
				// If Count.txt exists, read the count from it and
				// store the count in application state
				_path = Server.MapPath ("Count.txt");
				reader = new StreamReader (_path);
				string line = reader.ReadLine ();
				int count = Convert.ToInt32 (line);
				Application["Count"] = count;
			}
			catch (Exception) 
			{
				// If Count.txt does not exist or contains an invalid
				// count, store a 0 in application state
				Application["Count"] = 0;
			}
			finally 
			{
				// Close the StreamReader
				if (reader != null)
					reader.Close ();
			}
			//日志
			StreamWriter writer = null;
			try 
			{
				_logpath = Server.MapPath ("Log.txt");
				writer = new StreamWriter (_logpath, false);
				writer.WriteLine("Application_Start"+DateTime.Now.ToLongTimeString());
			}
			finally 
			{
				// Close the StreamWriter
				if (writer != null)
					writer.Close ();
			}

		}
 
		protected void Session_Start(Object sender, EventArgs e)
		{

		}

		protected void Application_BeginRequest(Object sender, EventArgs e)
		{

		}

		protected void Application_EndRequest(Object sender, EventArgs e)
		{

		}

		protected void Application_AuthenticateRequest(Object sender, EventArgs e)
		{

		}

		protected void Application_Error(Object sender, EventArgs e)
		{

		}

		protected void Session_End(Object sender, EventArgs e)
		{

		}

		protected void Application_End(Object sender, EventArgs e)
		{
			//关闭IIS时激发
			//注意在此外不能使用Server.MapPath,所以用静态字段保存路径
			StreamWriter writer = null;
			try 
			{
				// Save the current count in Count.txt
				writer = new StreamWriter (_path, false);
				writer.Write (Application["Count"]);
			}
			finally 
			{
				// Close the StreamWriter
				if (writer != null)
					writer.Close ();
			}
			//日志
			try 
			{
				writer = new StreamWriter (_logpath, false);
				writer.WriteLine("Application_End"+DateTime.Now.ToLongTimeString());
			}
			finally 
			{
				// Close the StreamWriter
				if (writer != null)
					writer.Close ();
			}
		}
			
		#region Web 窗体设计器生成的代码
		/// <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.components = new System.ComponentModel.Container();
		}
		#endregion
	}
}