C＃中的Windows服务无法启动

Question

I've created a Windows Service using C# & VS 2012 Express. After I've successfully installed the service but when I try to start it I get the following error in the Windows Application Log: Cannot change service name when the service is running.

I'm a VB6 coder trying my hand at C# (call me crazy for starting with a service)...

You input would be greatly appreciated.

Here's my code:

using System;
using System.IO;
using System.ComponentModel;
using System.ServiceProcess;
using System.Configuration.Install;

public class KFolderWatcher : ServiceBase
{
    public const string MyServiceName = "KFolderWatcher";
    private FileSystemWatcher watcher = null;

    public KFolderWatcher()
    {
        this.ServiceName = "KFolderWatcher";
        this.CanStop = true;
        this.CanPauseAndContinue = false;
        this.AutoLog = true;
    }

    protected override void OnStart(string[] args)
    {
        this.ServiceName = MyServiceName;

        // Create a new FileSystemWatcher with the path and jpg file filter
        FileSystemWatcher watcher = new FileSystemWatcher("c:\\scans\\", "*.jpg");

        //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;

        // 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;
    }

    protected override void OnStop()
    {
        watcher.EnableRaisingEvents = false;
        watcher.Dispose();

        //LogEvent("Monitoring Stopped");
        Console.WriteLine("Monitoring Stopped");
    }

    void OnRenamed(object sender, RenamedEventArgs e)
    {
        string log = string.Format("{0} | Renamed from {1}", e.FullPath, e.OldName);
        //LogEvent(log);
        Console.WriteLine(log);
    }

    public static void Main()
    {
        ServiceBase.Run(new KFolderWatcher());
    }

    //This method is called when a file is created, changed, or deleted.
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
        //Show that a file has been created, changed, or deleted.
        WatcherChangeTypes wct = e.ChangeType;
        Console.WriteLine("File {0} {1}", e.FullPath, wct.ToString());
    }

    protected void FileCreated(object sender, FileSystemEventArgs e)
    {
        if (e.ChangeType == WatcherChangeTypes.Created)
        {
            if (Directory.Exists(e.FullPath))
                Console.WriteLine("A new folder has been created.");
            else
                Console.WriteLine("A new file has been created.");
        }
    }

}

[RunInstaller(true)]
public class KFolderWatcherInstaller : Installer
{
    private ServiceProcessInstaller processInstaller;
    private ServiceInstaller serviceInstaller;

    public KFolderWatcherInstaller()
    {
        processInstaller = new ServiceProcessInstaller();
        serviceInstaller = new ServiceInstaller();
        processInstaller.Account = ServiceAccount.LocalSystem;
        processInstaller.Username = null;
        processInstaller.Password = null;
        serviceInstaller.StartType = ServiceStartMode.Manual;
        serviceInstaller.ServiceName = "KFolderWatcher";
        serviceInstaller.DisplayName = "Kempston Folder Watcher";
        serviceInstaller.Description = "Monitor Branch Folder for images to upload.";
        Installers.Add(serviceInstaller);
        Installers.Add(processInstaller);
    }
}

Answer 1

Please avoid assigning the service name in Service class. Since you have already created an installer which assigns the service Name, it is not required to write it inside service.

serviceInstaller.ServiceName = "KFolderWatcher";

public class KFolderWatcher : ServiceBase
{
    //public const string MyServiceName = "KFolderWatcher";
    private FileSystemWatcher watcher = null;

    public KFolderWatcher()
    {
      //  this.ServiceName = "KFolderWatcher";
        this.CanStop = true;
        this.CanPauseAndContinue = false;
        this.AutoLog = true;
    }

    protected override void OnStart(string[] args)
    {
       // this.ServiceName = MyServiceName;
 .....

Answer 2

The line

this.ServiceName = MyServiceName;

in the OnStart() method is causing the problem.