我正在使用 FileSystemWatcher 来监视 app.config 文件中的任何更改。而且，写入配置文件。
这是我的代码：
MyApplication是主项目，DataCache是MyApplication中引用的类库。
using System;
using System.Threading;
using System.IO;
namespace MyApplication
{
public class Program
{
public static string rootFolderPath = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
public static string configFilePath = Path.Combine(rootFolderPath, "MyApplication.exe.config");static void Main(string[] args)
{
//First Time initializing the config file.
ConfigFileMonitor.SetConfigFileAtRuntime(configFilePath);
//Initializing the config file monitor on a separate thread.
Thread monitorThread = new Thread(ConfigFileMonitor.BeginConfigFilesMonitor);
monitorThread.Start();
WriteToConfigFile();
}
static void WriteToConfigFile()
{
Console.WriteLine(String.Format("Hello {0} {1}", DataCache.Section1Data.FirstNameString, DataCache.Section1Data.LastNameString));
string _firstName, _lastName = string.Empty;
do
{
Console.WriteLine("");
Console.Write("First Name : ");
_firstName = Console.ReadLine();
Console.Write("Last Name : ");
_lastName = Console.ReadLine();
if(_firstName.Length>0)
DataCache.Section1Data.FirstNameString = _firstName;
if(_lastName.Length>0)
DataCache.Section1Data.LastNameString = _lastName;
Console.WriteLine(String.Format("Hello {0} {1}", DataCache.Section1Data.FirstNameString, DataCache.Section1Data.LastNameString));
}
while (true);
}
}
}
using System;
using System.IO;
namespace MyApplication
{
/// <summary>
/// Monitors for any change in the app.config file
/// </summary>
public class ConfigFileMonitor
{
private static FileSystemWatcher _watcher;
private static string _configFilePath = String.Empty;
private static string _configFileName = String.Empty;
/// <summary>
/// Texts the files surveillance.
/// </summary>
public static void BeginConfigFilesMonitor()
{
try
{
string fileToMonitor = Program.configFilePath;
if (fileToMonitor.Length == 0)
Console.WriteLine("Incorrect config file specified to watch");
else
{
_configFileName = Path.GetFileName(fileToMonitor);
_configFilePath = fileToMonitor.Substring(0, fileToMonitor.IndexOf(_configFileName));
}
// Use FileWatcher to check and update only modified text files.
WatchConfigFiles(_configFilePath, _configFileName);
}
catch (Exception e1)
{
Console.WriteLine(e1.Message);
}
}
/// <summary>
/// Watches the files.
/// </summary>
/// <param name="targetDir">The target dir.</param>
/// <param name="filteredBy">The filtered by.</param>
static void WatchConfigFiles(string targetDir, string filteredBy)
{
try
{
_watcher = new FileSystemWatcher();
_watcher.Path = targetDir;
_watcher.Filter = filteredBy;
_watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite;
_watcher.EnableRaisingEvents = true;
_watcher.Changed += new FileSystemEventHandler(FileChanged);
_watcher.WaitForChanged(WatcherChangeTypes.Changed);
}
catch (Exception e1)
{
Console.WriteLine(e1.Message);
}
}
/// <summary>
/// Handles the Changed event of the File control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.IO.FileSystemEventArgs"/> instance containing the event data.</param>
protected static void FileChanged(object sender, FileSystemEventArgs e)
{
try
{
_watcher.EnableRaisingEvents = false;
string filechange = e.FullPath;
Console.WriteLine("Configuration File: " + filechange + "changed");
//Since the file is changed - We have reload the configuration settings again.
SetConfigFileAtRuntime(Path.Combine(Program.rootFolderPath, "MyApplication.exe.config"));
Console.WriteLine(String.Format("New Name : {0} {1}", DataCache.Section1Data.FirstNameString, DataCache.Section1Data.LastNameString));
_watcher.EnableRaisingEvents = true;
}
catch (Exception e1)
{
Console.WriteLine(e1.Message);
}
}
/// <summary>
/// Sets the config file at runtime.
/// </summary>
/// <param name="configFilePath"></param>
public static void SetConfigFileAtRuntime(string configFilePath)
{
string runtimeconfigfile;
try
{
if (configFilePath.Length == 0)
Console.WriteLine("Please specify a config file to read from ");
else
{
runtimeconfigfile = configFilePath;
_configFileName = Path.GetFileName(configFilePath);
_configFilePath = configFilePath.Substring(0, configFilePath.IndexOf(_configFileName));
}
// Specify config settings at runtime.
//System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
DataCache.DataConfigSection.config = System.Configuration.ConfigurationManager.OpenExeConfiguration(configFilePath);
//Similarly you can apply for other sections like SMTP/System.Net/System.Web etc..
//But you have to set the File Path for each of these
//config.AppSettings.File = runtimeconfigfile;
//This doesn't actually going to overwrite you Exe App.Config file.
//Just refreshing the content in the memory.
DataCache.DataConfigSection.config.Save(System.Configuration.ConfigurationSaveMode.Modified);
//Refreshing Config Section
//ConfigurationManager.RefreshSection("appSettings");
System.Configuration.ConfigurationManager.RefreshSection("MySectionGroup/Section1");
DataCache.Section1Data.configSection1 = null;
}
catch (Exception e1)
{
Console.WriteLine(e1.Message);
}
}
}
}
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="MySectionGroup">
<section name="Section1" type="DataCache.DataConfigSection, DataCache" allowLocation="false" allowDefinition="Everywhere"/>
<section name="Section2" type="DataCache.DataConfigSection, DataCache" allowLocation="false" allowDefinition="Everywhere"/>
</sectionGroup>
</configSections>
<MySectionGroup>
<Section1>
<name
firstName ="Pierce"
lastName ="Brosnan"
/>
</Section1>
</MySectionGroup>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
</configuration>
以下是 DataCache 类：
using System;
namespace DataCache
{
public sealed class DataConfigSection : System.Configuration.ConfigurationSection
{
public static System.Configuration.Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(
System.IO.Path.Combine(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetAssembly(typeof(DataConfigSection)).Location), "MyApplication.exe"));
// Create a "name" element.
[System.Configuration.ConfigurationProperty("name")]
public NameElement Name
{
get
{
return (NameElement)this["name"];
}
set
{
this["name"] = value;
}
}
// Define the "name" element
// with firstName, secondName attributes.
public class NameElement : System.Configuration.ConfigurationElement
{
[System.Configuration.ConfigurationProperty("firstName", DefaultValue = "abcd", IsRequired = true)]
public String FirstName
{
get
{
return (String)this["firstName"];
}
set
{
this["firstName"] = value;
}
}
[System.Configuration.ConfigurationProperty("lastName", DefaultValue = "xyz", IsRequired = true)]
public String LastName
{
get
{
return (String)this["lastName"];
}
set
{
this["lastName"] = value;
}
}
}
}
}
namespace DataCache
{
public class Section1Data
{
public static volatile DataConfigSection configSection1;
private static object syncRoot = new System.Object();
public const string Section1ConfigSectionName = "MySectionGroup/Section1";
private Section1Data() { }
public static DataConfigSection ConfigSection1
{
get
{
lock (syncRoot)
{
if (configSection1 == null)
{
DataConfigSection.config = System.Configuration.ConfigurationManager.OpenExeConfiguration(System.IO.Path.Combine(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetAssembly(typeof(DataConfigSection)).Location), "MyApplication.exe"));
configSection1 = (DataConfigSection)DataConfigSection.config.GetSection(Section1ConfigSectionName);
}
}
return configSection1;
}
}
public static string FirstNameString
{
get
{
return ConfigSection1.Name.FirstName.ToString();
}
set
{
ConfigSection1.Name.FirstName = value;
DataConfigSection.config.Save();
}
}
public static string LastNameString
{
get
{
return ConfigSection1.Name.LastName.ToString();
}
set
{
ConfigSection1.Name.LastName = value;
DataConfigSection.config.Save();
}
}
}
}
问题是，如果从控制台输入对名称进行了任何更改，则 FileChanged 会被调用一次，并且后续更改不会触发它。此外，如果手动对配置文件进行更改，它可以正常工作，直到从控制台进行更改为止，事件会一直触发。
我不确定为什么这行为很奇怪。有人能帮我一下吗。
谢谢，莫妮卡