Windows Server 2012 System.IndexOutOfRangeException

Question

我已经编写了一个服务，它在我的计算机上运行良好，但是当我将它移到应该运行它的服务器上时，它会吐出 System.IndexOutOfRangeException 每当它像它应该的那样读取/写入文件时也。我只是觉得它只在服务器上执行此操作很奇怪，而且我不知道它们与我的计算机的工作方式有何不同，因此将不胜感激。

描述：进程因未处理的异常而终止。 异常信息：System.IndexOutOfRangeException 堆： 在 emlService.emlService.runProc() 在 System.Threading.ThreadHelper.ThreadStart_Context(System.Object) 在 System.Threading.ExecutionContext.RunInternal（System.Threading.ExecutionContext，System.Threading.ContextCallback，System.Object，布尔） 在 System.Threading.ExecutionContext.Run（System.Threading.ExecutionContext，System.Threading.ContextCallback，System.Object，布尔） 在 System.Threading.ExecutionContext.Run（System.Threading.ExecutionContext，System.Threading.ContextCallback，System.Object） 在 System.Threading.ThreadHelper.ThreadStart()

代码

public partial class emlService : ServiceBase
{
    Boolean _isRunning;

    public emlService()
    {
        InitializeComponent();
        if (!System.Diagnostics.EventLog.SourceExists("emlServiceSource"))
        {
            System.Diagnostics.EventLog.CreateEventSource(
                "emlServiceSource", "emlServiceLog");
        }
        eventLog1.Source = "emlSerivceSource";
        eventLog1.Log = "emlServiceLog";
    }

    protected override void OnStart(string[] args)
    {
        eventLog1.WriteEntry("In OnStart");
        Thread NewThread = new Thread(new ThreadStart(runProc));
        _isRunning = true;
        //Creates bool to start thread loop
        if (_isRunning)
        {
            NewThread.Start();
        }
    }

    protected override void OnStop()
    {
        eventLog1.WriteEntry("In OnStop");
        _isRunning = false;             
    }

    protected override void OnContinue()
    {            
    }

    public void runProc()
    {         

        //Directory of the drop location
        string tempDrop = ConfigurationSettings.AppSettings["conf_drop"];
        DirectoryInfo drop = new DirectoryInfo(tempDrop);

        //Directory of the pickup location
        string tempPickup = ConfigurationSettings.AppSettings["conf_pickup"];
        string destpath = tempPickup;

        //Inits ParserCommands and DropDirectory object
        ParserCommands parserObject = new ParserCommands();

        //Inits array to hold number of messages in drop location
        FileInfo[] listfiles;

        //Inits CFG
        string conf_mailsender = ConfigurationSettings.AppSettings["conf_mailsender"];
        string conf_rcpt = ConfigurationSettings.AppSettings["conf_rcpt"];
        string conf_username_and_password = ConfigurationSettings.AppSettings["conf_username_and_password"];
        string conf_sender = ConfigurationSettings.AppSettings["conf_sender"];
        string conf_raport = ConfigurationSettings.AppSettings["conf_raport"];

        //Loop that never ends
        while (true) 
        {
            //Reduces load on machine
            Thread.Sleep(1000);

            //Checks if there is a message waiting to be processed and begins processing if so
            listfiles = drop.GetFiles();
            if (listfiles.Length >= 1)
            {
                for (int j = 0; j <= (listfiles.Length - 1); j++)
                {
                    //Gives it time to breathe
                    Thread.Sleep(250);

                    try
                    {
                        //Gets each line of the original .eml into a string array
                        var lines = File.ReadAllLines(listfiles[j].FullName);
                        string[] linestring = lines.Select(c => c.ToString()).ToArray();

                        //Seperates start of email from the rest and decode parameter_content
                        string parameter_to = parserObject.getReciever(linestring[12]);
                        string parameter_content = parserObject.DecodeFrom64(linestring[17]);

                        //Creates string ready for base64 encode
                        string encode = "from=" + conf_sender + "&to=" + parameter_to + "&raport=" + conf_raport + "&message=" + parameter_content;

                        //Opens up steam and writer in the new dest, creates new .eml file
                        using (FileStream fs = new FileStream(destpath + listfiles[j].Name, FileMode.CreateNew))
                        using (StreamWriter writer = new StreamWriter(fs))
                        {

                            //Writes all .eml content into buffer
                            writer.WriteLine("x-sender: " + conf_mailsender);
                            writer.WriteLine("x-receiver: " + conf_rcpt);
                            writer.WriteLine(linestring[2]);
                            writer.WriteLine(linestring[3]);
                            writer.WriteLine(linestring[4]);
                            writer.WriteLine(linestring[5]);
                            writer.WriteLine(linestring[6]);
                            writer.WriteLine(linestring[7]);
                            writer.WriteLine(linestring[8]);
                            writer.WriteLine("From: " + conf_mailsender);
                            writer.WriteLine(linestring[10]);
                            writer.WriteLine("Reply-To: " + conf_mailsender);
                            writer.WriteLine("To: " + conf_rcpt);
                            writer.WriteLine("Subject: " + conf_username_and_password);
                            writer.WriteLine("Return-Path: " + conf_mailsender);
                            writer.WriteLine(linestring[15]);
                            writer.WriteLine();

                            //Writes encoded string into buffer
                            writer.WriteLine(parserObject.EncodeTo64(encode));

                            //Writes buffer into .eml file
                            writer.Flush();
                        }

                        lines = null;
                    }
                        catch (System.IO.IOException e)
                    {
                        Console.WriteLine("no");

                    }

                    //Deletes the file
                    File.Delete(listfiles[j].FullName);
                }

                //Sets the number of files needing sent to 0
                listfiles = null;
            }
        }
    }
}

Answer 1

据我所知，您没有在任何地方检查linestring 的长度。我不能肯定地说，因为您没有提供足够的信息，但我会认为 linestring.Length 小于 17，导致 parserObject.DecodeFrom64(linestring[17]); 抛出异常。也可能是linestring.Length 小于 12，它是之前的那一行。

要解决这个问题，您应该检查linestring 的长度并适当地处理结果。

string[] linestring = lines.Select(c => c.ToString()).ToArray();
if(linestring.Length <= 17)
{
    //handle malformed file
}
else
{
    //complete the processing
}

与您的问题无关，但我很好奇您认为lines.Select(c => c.ToString() 的效果是什么。 File.ReadAllLines() 已经返回一个字符串数组，所以 `Select(c => c.ToString()) 是多余的。

Answer 2

在您正在阅读的一行中，线串不是您期望的长度。

你确定这永远不会失败吗？

linestring[17]

如果您的文件中有一个空行怎么办？