为什么我的XDocument保存了一个不完整的文件

我有一个使用线程运行一系列插件的程序。在这个过程中，它将插件的运行时写入到一个XDocument中，以便程序知道自上次运行该插件以来已经过了多长时间。不过我有个问题。大约每天一次(在不可预测的时间)，当我加载XDocument时，我得到以下错误:

[04/01/2013 08:17:10.083] Unexpected end of file has occurred. The following elements are not closed: Database, DatabaseList. Line 4043, position 1.

我运行了一些跟踪语句，发现在此之前，服务失败了，大约有44个插件要运行，这显然导致XDocument在没有写入文件末尾的情况下关闭。它写入和读取硬盘上的XML文件，但是它在内存中对XDocument执行所有操作，因为我使用Linq对数据执行复杂的操作。

有人知道为什么会这样吗?如何加载XDocument，以便在运行过程中发生某些事情时它不会破坏实际文件?

编辑:下面是使用XDocument(命名为XDoc)的代码示例:

    private void RunPlugin(object oQueuedPlugin)
    {
        PluginState oPluginState = (PluginState)oQueuedPlugin;
        PluginResponse oResponse = new PluginResponse();
        XElement xPlugin;
        lock (xDoc)
        {
            xPlugin = GetPluginNode(oPluginState.ClientFusionDatabase.Name, oPluginState.Plugin.Name);
        }
        if (xPlugin == null)
        {
            API.Log.Write("ActivityTrace.ShowXMLLog", "XML for " + oPluginState.ClientFusionDatabase.Name + " was null.");
            XElement NewPlugin = new XElement("Plugin",
                new XAttribute("PluginName", oPluginState.Plugin.Name),
                new XAttribute("Running", "true"),
                new XAttribute("LastStart", DateTime.Now.ToString()),
                new XAttribute("LastSuccess", ""),
                new XAttribute("LastExitStatus",""));
            lock (xDoc)
            {
                var Location = from database in xDoc.Root.Elements("Database")
                               where database.Attribute("DatabaseName").Value == oPluginState.ClientFusionDatabase.Name
                               select database;
                Location.FirstOrDefault().Add(NewPlugin);
                xDoc.Save(XmlLogFilePath);
            }
            oResponse = oPluginState.Plugin.Run(oPluginState.ClientFusionDatabase);
            if (oResponse == null)
            {
                API.Log.Write("ActivityTrace.ShowNullReturnLog", oPluginState.ClientFusionDatabase.Name + "- " + oPluginState.Plugin.Name + " returned null.");
            }
            lock (xDoc)
            {
                NewPlugin.Attribute("Running").Value = "false";
                NewPlugin.Attribute("LastExitStatus").Value = oResponse.ResponseType.ToString();
                if (oResponse.ResponseType == PluginResponseTypes.Success || oResponse.ResponseType == PluginResponseTypes.Warning)
                    NewPlugin.Attribute("LastSuccess").Value = DateTime.Now.ToString();
                xDoc.Save(XmlLogFilePath);
            }
            API.Log.Write("ActivityTrace.ShowXMLLog","Completed " + oPluginState.ClientFusionDatabase.Name + "- " + oPluginState.Plugin.Name + " with XML " + NewPlugin.ToString());
            API.Log.Write(oPluginState.Plugin.Name, "(" + oPluginState.ClientFusionDatabase.Connection.Database + " = " + (oResponse.ResponseType + ") ").PadRight(9) + "EXIT MESSAGE: " + (string.IsNullOrEmpty(oResponse.Message) ? "None" : oResponse.Message));
        }
        else
        {
            DateTime dLastRun = (DateTime)xPlugin.Attribute("LastStart");
            bool bRunning = (bool)xPlugin.Attribute("Running");
            if ((DateTime.Now - dLastRun) > oPluginState.Plugin.Interval && !bRunning)
            {
                lock (xDoc)
                {
                    xPlugin.Attribute("LastStart").Value = DateTime.Now.ToString();
                    xPlugin.Attribute("Running").Value = "true";
                    xDoc.Save(XmlLogFilePath);
                }
                oResponse = oPluginState.Plugin.Run(oPluginState.ClientFusionDatabase);
                lock (xDoc)
                {
                    xPlugin.Attribute("Running").Value = "false";
                    xPlugin.Attribute("LastExitStatus").Value = oResponse.ResponseType.ToString();
                    if (oResponse.ResponseType == PluginResponseTypes.Success || oResponse.ResponseType == PluginResponseTypes.Warning)
                        xPlugin.Attribute("LastSuccess").Value = DateTime.Now.ToString();
                    xDoc.Save(XmlLogFilePath);
                }
                API.Log.Write(oPluginState.Plugin.Name, "(" + oPluginState.ClientFusionDatabase.Connection.Database + " = " + (oResponse.ResponseType + ") ").PadRight(9) + "EXIT MESSAGE: " + (string.IsNullOrEmpty(oResponse.Message) ? "None" : oResponse.Message));
            }
            else if (bRunning)
                API.Log.Write(oPluginState.Plugin.Name, "(" + oPluginState.ClientFusionDatabase.Connection.Database + " = " + ("SKIPPED) ").PadRight(9) + "REASON: Plugin already running");
        }
        oPluginState.Complete = true;
    }

问题是一个或多个插件没有正确处理错误，这导致它没有返回任何响应并导致程序崩溃。