配置文件相关的代码

1、配置文件监听

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Configuration;

using System.IO;



namespace CSharpStudy

{

    public sealed class ConfigMonitor

    {

        /// <summary>

        /// file path

        /// </summary>

        private static string filePath = string.Empty;



        /// <summary>

        /// file map

        /// </summary>

        private static ExeConfigurationFileMap configFileMap;



        /// <summary>

        /// constructor 

        /// </summary>

        static ConfigMonitor()

        {

            Console.WriteLine("constructor...");

            MonitorConfigFile();

            InitConfigInfo();

        }



        /// <summary>

        /// after change config delegate

        /// </summary>

        public delegate void AfterConfigModifyEvent();



        /// <summary>

        /// after change config event

        /// </summary>

        public static event AfterConfigModifyEvent afterConfigModifyEvent;



        /// <summary>

        /// config object

        /// </summary>

        public static Configuration Config

        {

            get;

            set;

        }



        /// <summary>

        /// monitor config file

        /// </summary>

        public static void MonitorConfigFile()

        {

            Console.WriteLine("MonitorConfigFile...");

            // don't throw exception 

            try

            {

                FileSystemWatcher fileWatcher = new FileSystemWatcher();

                fileWatcher.Path = AppDomain.CurrentDomain.SetupInformation.ApplicationBase;

                fileWatcher.Filter = "ParamSettings.config";



                // add event handlers

                fileWatcher.Changed += new FileSystemEventHandler(OnChanged);

                fileWatcher.Created += new FileSystemEventHandler(OnChanged);

                fileWatcher.Deleted += new FileSystemEventHandler(OnChanged);

                fileWatcher.Renamed += new RenamedEventHandler(OnChanged);



                fileWatcher.EnableRaisingEvents = true;

            }

            catch

            {

            }

        }



        public static void OnChanged(object source, FileSystemEventArgs e)

        {

            InitConfigInfo();

            RaiseEvent();

        }



        /// <summary>

        /// init all config info

        /// </summary>

        public static void InitConfigInfo()

        {

            Console.WriteLine("InitConfigInfo...");



            try

            {

                // don't throw exception

                filePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + "\\ParamSettings.config";

                configFileMap = new ExeConfigurationFileMap();

                configFileMap.ExeConfigFilename = filePath;

                Config = ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);

            }

            catch

            {

            }

        }



        /// <summary>

        /// raise event 

        /// </summary>

        private static void RaiseEvent()

        {

            Console.WriteLine("RaiseEvent...");



            if (afterConfigModifyEvent != null)

            {

                afterConfigModifyEvent();

            }

        }

    }

}

2、SettingsFactory

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace CSharpStudy

{

    public class SettingsFactory

    {

        static SettingsFactory()

        {

            ConfigMonitor.MonitorConfigFile();

        }



        public static string ApplicationName

        {

            get

            {

                return GetAppSetting("ApplicationName");

            }

        }





        private static string GetAppSetting(string key)

        {

            return ConfigMonitor.Config.AppSettings.Settings[key].Value;

        }

    }

}

3、测试代码

 　　　　public static void TestConfigFile()

        {

            while (true)

            {

                string str = Console.ReadLine();

                if (str == "-1")

                {

                    break;

                }



                Console.WriteLine(SettingsFactory.ApplicationName);

            }

        }

4、运行截图

4.1 初始化

说明：

　　在输入回车后，打印SettingsFactory.ApplicationName信息，

　　第一、SettingsFactory构造函数初始化

　　（1）、ConfigMonitor构造函数初始化，执行构造函数里面的方法

　　　　打印:

　　　　contructor...

　　　　MonitorConfigFile...

 　　　  InitConfigInfo...

　　（2）、执行ConfigMonitor.MonitorConfigFile方法

　　　　打印:MonitorConfigFile...

　　  第二、执行SettingsFactory.ApplicationName方法，打印:CSharpStudy

4.2 使用值

　　

　　说明：再输入一次回车，结果打印：CSharpStudy。静态构造器，只在第一次使用该类的时候进行初始化。

4.3 程序运行时修改配置文件

找到项目所在目录下的：bin\Debug\ParamSettings.config配置文件，

将ApplicationName的Value修改为：测试项目

 

执行了四次OnChanged方法。

输入回车后

 

 5、配置文件ParamSettings.config

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <appSettings>

    <add key="ApplicationName" value="CSharpStudy"/>

  </appSettings>

</configuration>