Windows服务在运行时未找到引用的dll

Question

我在VS2010中有一个解决方案，它包含两个项目，一个ASP.NET MVC3项目和一个Windows服务项目。该服务由于dll参考问题而崩溃（我在这里查看了类似的问题，并没有什么特别相关的）。

windows服务遍历一个目录结构，并创建一个由MVC站点显示的html文件。为此，我使用HtmlAgilityPack dll创建html文件。

在该站点的Global.asax.cs中，调用一个方法来检查服务是否已安装，如果不是，则会安装并运行它。这里是文件：

using System.ServiceProcess; 
using System.Configuration.Install; 
using KBDocumentConverterService.Converter; 
using KBDocumentConverterService; 

namespace Knowledgebase 
{ 
    public class MvcApplication : System.Web.HttpApplication 
    { 
     ... 

     // Check if service has been stopped, start if it has 
     void CheckServiceStatus(ServiceController sc) 
     { 
      if (sc.Status == ServiceControllerStatus.Stopped) 
      { 
       sc.Start(); 
      } 
     } 

     // Check if service is installed, install if it has not, then check 
     // to see if it needs to be started 
     void TryInstallService() 
     { 
      ServiceController sc = ServiceController.GetServices() 
       .Where(service => service.ServiceName == "KBDocumentConverterService") 
       .FirstOrDefault(); 

      if (sc == null) 
      { 
       // Call static method that will attempt to install service 
       // and return bool representation of install's success 
       if (MyServiceInstaller.InstallMe()) 
       { 
        sc = ServiceController.GetServices() 
         .Where(service => service.ServiceName == "KBDocumentConverterService") 
         .FirstOrDefault(); 

        CheckServiceStatus(sc); 
       } 
      } 
      else 
      { 
       CheckServiceStatus(sc); 
      } 
     } 

     protected void Application_Start() 
     { 
      AreaRegistration.RegisterAllAreas(); 

      RegisterGlobalFilters(GlobalFilters.Filters); 
      RegisterRoutes(RouteTable.Routes); 

      TryInstallService(); 
     } 
    } 
} 

该服务正在安装到LocalSystem帐户;它将安装，它将运行，但只要它获取包含参考HtmlAgilityPack DLL，它抛出以下信息的异常类：如果我为服务创建单独的解决方案

Could not load file or assembly 'HtmlAgilityPack, Version=1.4.5.0, Culture=neutral, PublicKeyToken=bd319b19eaf3b43a' 
or one of its dependencies. The system cannot find the file specified. 

KBDocumentConverterService 
    at KBDocumentConverterService.Converter.ConvertToHtml.CreateContentList() 
    at KBDocumentConverterService.Converter.ConvertToHtml.RunConversion() 
    in C:\Documents and Settings\Administrator\My Documents\Dropbox\Programming\CSharp\Websites\Knowledgebase\ 
    KBDocumentConverterService\Converter\ConvertToHtml.cs:line 263 
    at KBDocumentConverterService.Service1.StartConversion() 
    in C:\Documents and Settings\Administrator\My Documents\Dropbox\Programming\CSharp\Websites\ 
    Knowledgebase\KBDocumentConverterService\Service1.cs:line 39 

，并安装它，它会运行良好。如果包含在另一个项目的解决方案中，那么为什么服务在参考路径中存在困难（HtmlAgilityPack文件夹包含在服务项目文件夹中），我有点不知所措。

下面是在服务相关的类 -

用于编程安装类：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Reflection; 
using System.Configuration.Install; 

namespace KBDocumentConverterService 
{ 
    public static class MyServiceInstaller 
    { 
     private static readonly string _exePath = Assembly.GetExecutingAssembly().Location; 

     public static bool InstallMe() 
     { 
      try 
      { 
       ManagedInstallerClass.InstallHelper(new string[]{ _exePath }); 
      } 
      catch 
      { 
       return false; 
      } 

      return true; 
     } 
    } 
} 

创建HTML文件，该DLL被引用的类：使用系统 ; using System.Collections.Generic;使用System.Linq的 ; using System.Web; 使用Microsoft.Office; 使用Microsoft.Office.Interop.Word; using System.Diagnostics;使用System.IO的 ; using System.Reflection; using KBDocumentConverterService.Models; 使用HtmlAgilityPack;

namespace KBDocumentConverterService.Converter 
{ 
    public class ConvertToHtml 
    { 
     //This creates new object of Word.ApplicationClass 
     static Microsoft.Office.Interop.Word.Application objWord; 

     // Directory for files converted from Word docs to Html. 
     static readonly string _htmlKnowledgeBaseDir = Path.GetPathRoot(Environment.SystemDirectory) + 
      "\\Knowledgebase\\HTML"; 

     // Directory for Word files to be converted. 
     static readonly string _docKnowledgeBaseDir = Path.GetPathRoot(Environment.SystemDirectory) + 
      "\\Knowledgebase\\DOCS"; 

     // Directory for holding the Content List which represents the knowledgebase 
     // directory and file structure. Will be used to create menu for user to browse 
     // articles. 
     static readonly string _htmlContentDir = Path.GetPathRoot(Environment.SystemDirectory) + 
      "\\Knowledgebase\\Content"; 

     //Path to upload files "Uploaded" 
     static string strPathToUpload; 

     //Path to convert uploaded files and save 
     static string strPathToConvert; 

     //For filtered HTML Output 
     static object fltDocFormat = 10; 

     //Is just to skeep the parameters which are passed as boject reference, these are seems to be optional parameters 
     static object missing = System.Reflection.Missing.Value; 

     static object readOnly = false; 

     //The process has to be in invisible mode 
     static object isVisible = false; 

     // List of files that have already been converted to html 
     static List<string> _htmlKnowledgebaseFiles = new List<string>(); 

     // List of file contained in the folder structure that represents 
     // a knowledgebase; these files will be converted to html to be 
     // displayed on a website. 
     static List<string> _docKnowledgebaseFiles = new List<string>(); 

     static void ConvertDocToHTML(string fileName) 
     { 
      try 
      { 
       objWord = new Microsoft.Office.Interop.Word.Application(); 

       //To check the file extension if it is word document or something else 
       string strFileName = Path.GetFileNameWithoutExtension(fileName); 
       string strExt = Path.GetExtension(fileName); 

       //Map-path to the folder where html to be saved 
       strPathToConvert = Path.GetDirectoryName(fileName).Replace("Knowledgebase\\DOCS", "Knowledgebase\\HTML"); 

       object FileName = fileName.Clone(); 
       object FileToSave = strPathToConvert + "\\" + strFileName + ".htm"; 

       if(!File.Exists((string) FileToSave)) 
       { 
        if (strExt.ToLower().Equals(".doc") || strExt.ToLower().Equals(".docx")) 
        { 
         //open the file internally in word. In the method all the parameters should be passed by object reference 
         objWord.Documents.Open(ref FileName, ref readOnly, ref missing, ref missing, ref missing, ref missing, 
         ref missing, ref missing, ref missing, ref missing, ref isVisible, ref missing, ref missing, ref missing, 
         ref missing, ref missing); 

         //Do the background activity 
         objWord.Visible = false; 
         Microsoft.Office.Interop.Word.Document oDoc = objWord.ActiveDocument; 

         //Save to Html format 
         oDoc.SaveAs(ref FileToSave, ref fltDocFormat, ref missing, ref missing, ref missing, ref missing, 
         ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, 
         ref missing, ref missing); 
        } 
       } 

       //Close/quit word 
       ((_Application)objWord).Quit(); 

       _htmlKnowledgebaseFiles.Add((string) FileToSave); 
      } 
      catch(Exception ex) 
      { 
       ((_Application)objWord).Quit(); 
      } 
     } 

     // Check that knowledgebase folders exist. 
     static void InitialiseFolders() 
     { 

      if(!Directory.Exists(_docKnowledgeBaseDir)) 
      { 
       Directory.CreateDirectory(_docKnowledgeBaseDir); 
      } 

      if(!Directory.Exists(_htmlKnowledgeBaseDir)) 
      { 
       Directory.CreateDirectory(_htmlKnowledgeBaseDir); 
      } 

      if (!Directory.Exists(_htmlContentDir)) 
      { 
       Directory.CreateDirectory(_htmlContentDir); 
      } 
     } 

     //Initialise lists that contain files to be converted, and converted files. 
     static void InitialiseFileCollections() 
     { 
      // Check if converted document's source still exists. If it does, add to convertedFileNames list, 
      // otherwise delete it so that the "HTMLKnowledgeBase" structure is consistent with the 
      // "DOCKnowledgeBase" structure. 
      try 
      { 
       // Get all HTML and HTM files. 
       string[] convertedFiles = Directory.GetFiles(_htmlKnowledgeBaseDir, "*.*", SearchOption.AllDirectories) 
        .Where(file => file.ToLower().EndsWith("htm") || file.ToLower().EndsWith("html")) 
        .ToArray(); 

       // Delete converted file if source does not exist 
       foreach (string file in convertedFiles) 
       { 
        if (!File.Exists(file.Replace("Knowledgebase\\HTML", "Knowledgebase\\DOCS").Replace(".htm", ".doc")) || 
         !File.Exists(file.Replace("Knowledgebase\\HTML", "Knowledgebase\\DOCS").Replace(".html", ".doc")) || 
         !File.Exists(file.Replace("Knowledgebase\\HTML", "Knowledgebase\\DOCS").Replace(".htm", ".docx")) || 
         !File.Exists(file.Replace("Knowledgebase\\HTML", "Knowledgebase\\DOCS").Replace(".html", ".docx"))) 
        { 
         File.Delete(file); 

         // Delete folder that contains the content(images etc) for the html files. 
         if (Directory.Exists(Path.GetDirectoryName(file) + "\\" + Path.GetFileNameWithoutExtension(file) + "_files")) 
         { 
          bool deleteFiles = true; 
          Directory.Delete(Path.GetDirectoryName(file) + "\\" + Path.GetFileNameWithoutExtension(file) + "_files", deleteFiles); 
         } 
        } 
        else 
        { 
         _htmlKnowledgebaseFiles.Add(file); 
        } 
       } 
      } 
      catch (UnauthorizedAccessException uaEx) 
      { 
       // To implement 
      } 
      catch (IOException ioEx) 
      { 
       // To implement 
      } 

      // Get all files in the "DOCKnowledgeBase" folder. 
      string[] filesToConvert = Directory.GetFiles(_docKnowledgeBaseDir, "*.*", SearchOption.AllDirectories) 
       .Where(file => file.ToLower().EndsWith("doc") || file.ToLower().EndsWith("docx")) 
       .ToArray(); 

      // Check each file to be converted, if there is no corresponding converted file, add 
      // to list. 
      foreach (string file in filesToConvert) 
      { 
       if(!_docKnowledgebaseFiles.Contains(file)) _docKnowledgebaseFiles.Add(file); 
      } 
     } 

     // Traverse list of files to be converted and convert. 
     static void ConvertFiles() 
     { 
      foreach (string file in _docKnowledgebaseFiles) 
      { 
       if (!File.Exists(file.Replace("Knowledgebase\\DOCS", "Knowledgebase\\HTML").Replace(".doc", ".html")) && 
         !File.Exists(file.Replace("Knowledgebase\\DOCS", "Knowledgebase\\HTML").Replace(".docx", ".html")) && 
         !File.Exists(file.Replace("Knowledgebase\\DOCS", "Knowledgebase\\HTML").Replace(".doc", ".htm")) && 
         !File.Exists(file.Replace("Knowledgebase\\DOCS", "Knowledgebase\\HTML").Replace(".docx", ".htm"))) 
       { 

        if (!Directory.Exists(Path.GetDirectoryName(file).Replace("Knowledgebase\\DOCS", "Knowledgebase\\HTML"))) 
        { 
         Directory.CreateDirectory(Path.GetDirectoryName(file).Replace("Knowledgebase\\DOCS", "Knowledgebase\\HTML")); 
        } 

        ConvertDocToHTML(file); 
       } 
      } 
     } 


     static void GenerateHTML(DirectoryModel directory, HtmlDocument listFileDoc, HtmlNode directoryDiv) 
     { 
      HtmlNode linkContainerNode = listFileDoc.CreateElement("ul"); 

      foreach (string key in directory.Files.Keys) 
      { 
       HtmlNode listItem = listFileDoc.CreateElement("li"); 
       HtmlTextNode textNode = listFileDoc.CreateTextNode(key); 
       listItem.AppendChild(textNode); 

       HtmlAttribute id = listFileDoc.CreateAttribute("id", directory.Files[key]); 
       listItem.Attributes.Add(id); 

       linkContainerNode.AppendChild(listItem); 
      } 

      directoryDiv.AppendChild(linkContainerNode); 

      HtmlNode subdirectoryNode = listFileDoc.CreateElement("div"); 
      linkContainerNode.AppendChild(subdirectoryNode); 

      foreach(DirectoryModel subdirectory in directory.Subdirectories) 
      { 
       GenerateHTML(subdirectory, listFileDoc, subdirectoryNode); 
      } 
     } 

     // Create and populate html file to represent the existing knowledgebase 
     // file and directory structure. 
     static void CreateContentList() 
     { 
      string listFilePath = String.Empty; 

      // If no content list file exists, create it. if one does exist, create an alternative, this version 
      // will be pulled up by the site, and renamed to replace the orginal content list file. This is to ensure 
      // there are no errors with the site and this class trying to open the same file. 
      if (!File.Exists(_htmlContentDir + "\\content_list.htm")) 
      { 
       FileStream fs = File.Create(_htmlContentDir + "\\content_list.htm"); 
       listFilePath = _htmlContentDir + "\\content_list.htm"; 
       fs.Close(); 
      } 
      else 
      { 
       FileStream fs = File.Create(_htmlContentDir + "\\content_list_new.htm"); 
       listFilePath = _htmlContentDir + "\\content_list_new.htm"; 
       fs.Close(); 
      } 

      //Create html document 
      HtmlDocument listFileDoc = new HtmlDocument(); 
      listFileDoc.Load(listFilePath); 

      // Create instance of DirectoryModel which will hold knowledgebase directory and file structure 
      DirectoryModel rootDirectory = DirectoryModel.GenerateDirectoryStructure(_htmlKnowledgeBaseDir); 

      foreach(DirectoryModel directory in rootDirectory.Subdirectories) 
      { 
       HtmlNode directoryDiv = listFileDoc.CreateElement("div"); 
       GenerateHTML(directory, listFileDoc, directoryDiv); 
       listFileDoc.DocumentNode.ChildNodes.Add(directoryDiv); 
      } 

      listFileDoc.Save(listFilePath); 
     } 

     public static void RunConversion() 
     { 
      InitialiseFolders(); 
      InitialiseFileCollections(); 
      ConvertFiles(); 
      CreateContentList(); 
     } 
    } 
} 

而服务本身：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Diagnostics; 
using System.Linq; 
using System.ServiceProcess; 
using System.Text; 
using System.IO; 
using System.Threading; 
using KBDocumentConverterService.Converter; 

namespace KBDocumentConverterService 
{ 
    public partial class Service1 : ServiceBase 
    { 
     Thread conversionThread; 

     public Service1() 
     { 
      InitializeComponent(); 
      this.ServiceName = "KBDocumentConverterService"; 
     } 

     public string Name 
     { 
      get { return this.ServiceName; } 
     } 

     protected void StartConversion() 
     { 
      try 
      { 
       while (true) 
       { 
        if(!File.Exists("C:\\Service.txt")) 
         File.Create("C:\\Service.txt").Close(); 

        ConvertToHtml.RunConversion(); 
        Thread.Sleep(60000); 
       } 
      } 
      catch (Exception ex) 
      { 
       StreamWriter sw = File.AppendText("C:\\Service.txt"); 
       string mess = ex.Message + "\n" + ex.InnerException + "\n" + ex.Source + "\n" + ex.StackTrace; 
       sw.WriteLine(mess); 
       sw.Flush(); 
       sw.Close(); 
      } 
     } 

     protected override void OnStart(string[] args) 
     { 
      conversionThread = new Thread(new ThreadStart(StartConversion)); 

      conversionThread.Start(); 
     } 

     protected override void OnStop() 
     { 
     } 
    } 
} 

任何援助将不胜感激！

Answer 1

您收到的错误信息并不完全准确，因为它可能是HtmlAgilityPack失败或它依赖的某个程序集。您通常可以使用fuslogvw实用程序调试这些问题。