Question

我有一个多线程程序（3-4个线程）。所有线程都依赖于XML文件中指定的几个参数。
由于XML文件中的参数可能会被用户随时更改，因此需要通知不同的线程，并需要获取更新的参数副本。

要监控XML文件中的更改，我根据MSDN文档使用FileWatcher。

clas  ReadXML
{
//parameters
private static string Param1 = "";
private static string Param2 = "";


public static void ReadXmlParameters()
{
    XmlDocument xDoc = new XmlDocument();
    try
    {
        xDoc.Load(_ParameterFileDirrectory + @"\" + _ParameterFileDirrectory);

        //parameters
        Param1 = (xDoc.DocumentElement.SelectSingleNode("/Parameters/SetOne/IpAddress")).InnerText;
        Param2 = (xDoc.DocumentElement.SelectSingleNode("/Parameters/SetOne/Username")).InnerText;                
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    } 
}


public static void CreateXMLWatcher()
{
    try
    {
        // Create a new FileSystemWatcher and set its properties.
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.Path = _ParameterFileDirrectory;
        /* Watch for changes in LastAccess and LastWrite times, and 
           the renaming of files or directories. */
        watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
           | NotifyFilters.FileName | NotifyFilters.DirectoryName;
        // Only watch .xml files.
        watcher.Filter = _ParameterFileFilename; // "ParameterFile.xml";

        // Add event handlers.
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.Created += new FileSystemEventHandler(OnChanged);
        watcher.Deleted += new FileSystemEventHandler(OnChanged);
        watcher.Renamed += new RenamedEventHandler(OnRenamed);

        // Begin watching.
        watcher.EnableRaisingEvents = true;
    }
    catch(Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
}

// Define the event handlers.
private static void OnChanged(object source, FileSystemEventArgs e)
{
    // Specify what is done when a file is "Changed", "Created", or "Deleted".
    Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);

    if (e.ChangeType.ToString() == "Changed")
    {
        ReadXmlParameters(); //Read the Parameters from XML again

        MyThreadClass1._waitTillParametersChange.Set(); //Notifying the thread that the parameters might have chnaged

    }

}

}

上述实施对我来说很好。我必须使用以下行从Main（）启动FileWatcher：

public static void Main()
{
    ReadXml.ReadXmlParameters();        
    ReadXml.CreateXMLWatcher();

    // Start other threads now
}

然后我开始我的其他线程。

问题：由于上面提到的实现，我的程序中有静态方法和变量，所以我想知道这是否是{{{{或者我应该尝试通过将FileWatcher实现为单例类（或者为所有线程类提供相同的对象）来摆脱这些静态事物。

在多线程程序C＃

0 个答案: