IOException进程无法访问该文件，因为在使用XDocument时另一个进程正在使用该文件

Question

我一直收到一个IOException，它无法访问该文件，因为它正被另一个进程使用。我想做的是，每当我正在查看的文件发生更改时。。它通过TCP/IP将其作为阵列发送。我找不到任何关闭XDocument的方法，只是不知道如何修复这个错误。。。我在谷歌上搜索了一下，但还是找不到任何东西。任何帮助都将感谢

edit：我发现了filereader和其他东西的其他解决方案。。但使用xdocument 时似乎有所不同

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//filesystemwatcher
using System.IO;
//tcpip server
using System.Net;
using System.Net.Sockets;
//XML
using System.Xml;
using System.Xml.Linq;
namespace ChampSelect_FileWatcher
{
    class Program
    {
        //TCP IP variables
        public static Int32 port;
        public static IPAddress localAddr;
        public static TcpListener server;
        public static TcpClient client;
        public static NetworkStream stream;
        public static XDocument doc;

        public static void Main(string[] args)
        {
            //LOAD XML FILE
            doc = XDocument.Load("C:/Trio Scripts/example.xml");
            //OBSERVE FILE
            FileSystemWatcher watcher = new FileSystemWatcher();
            watcher.Path = @"C:Trio Scripts";
            watcher.Filter = "example.xml";
            //watch for changes in LastWrite
            watcher.NotifyFilter = NotifyFilters.LastWrite;
            //event handler
            watcher.Changed += new FileSystemEventHandler(OnChanged);
            //Begin watching
            watcher.EnableRaisingEvents = true;

            //TCP IP SERVER
            try
            {
                Console.WriteLine("Waiting for 99150 to run...n");
                //config TCP stuff
                port = 9905;
                localAddr = IPAddress.Parse("10.0.0.66");
                server = new TcpListener(localAddr, port);
                server.Start();
                client = server.AcceptTcpClient();
                stream = client.GetStream();
                Console.WriteLine("Connection to Viz successful!");
                Console.WriteLine("***LISTENING FOR CHANGES TO: " + watcher.Filter + "***n");

            }
            catch (SocketException z)
            {
                Console.WriteLine("SocketException: {0}", z);
            }
            //prevent console from closing
            Console.ReadKey();
            Console.ReadKey();
            Console.ReadKey();
        }
        // Define the event handlers.
        private static void OnChanged(object source, FileSystemEventArgs e)
        {
            //reload xml file
            //doc = XDocument.Load("C:/Trio Scripts/example.xml");
            //doc.Root.ReplaceWith(XElement.Load("C:/Trio Scripts/example.xml"));
            XDocument doc;
            using (var reader = XmlReader.Create("C:/Trio Scripts/example.xml"))
            {
                doc = XDocument.Load(reader);
            }
            // Nodes in XML
            string[] bans = doc.Descendants("ban").OrderBy(element => Int32.Parse(element.Attribute("order").Value)).Select(element => element.Value).ToArray();
            // String to send the message on
            String sendMsg = "";
            // Proceed with reading XML
            for (int i = 0; i < bans.Length; i++)
                sendMsg += bans[i] + " ";
            byte[] msg = System.Text.Encoding.ASCII.GetBytes(sendMsg);
            stream.Write(msg, 0, msg.Length);
            Console.WriteLine("Change detected, sending changes to Viz");
            sendMsg = "";
        }
    }//end class
}//end namespace

Answer 1

问题是，每当文件发生更改时，都会发生多个更改事件。

在读取更改后的文件之前，您应该等待一段时间。

此外，您应该使用e.FullPath并检查

 e.ChangeType == WatcherChangeTypes.Changed

如果未能打开文件，则应稍后再试。

Answer 2

您仍然可以使用XDocument和XmlReader:

XDocument doc;
using (var reader = XmlReader.Create("C:/Trio Scripts/example.xml"))
{
    doc = XDocument.Load(reader);
}

当读卡器的using块完成时，应该关闭文件句柄。

更新：

也许XmlReader.Create(string)的行为并没有以最简单的方式打开文件。如果这就是导致异常的原因，请尝试以下更明确的指定文件权限的代码：

XDocument doc;
using (var stream = File.Open("C:/Trio Scripts/example.xml", FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (var reader = XmlReader.Create(stream))
{
    doc = XDocument.Load(reader);
}