IOException 进程无法访问该文件，因为在使用 XDocument 时它正被另一个进程使用

Question

我不断收到一个 IOException，它无法访问该文件，因为它正被另一个进程使用。我想要做的是每次我正在查看的文件都被更改..它通过 TCP/IP 将其作为数组发送。我找不到任何关闭 XDocument 的方法，只是不知道如何解决这个错误……我用谷歌搜索，仍然找不到任何东西。任何帮助将不胜感激

编辑：我找到了文件阅读器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

问题在于，每当文件更改时，您都会收到多个更改事件。

在阅读更改后的文件之前，您应该稍等片刻。

您还应该使用e.FullPath 并检查

 e.ChangeType == WatcherChangeTypes.Changed

如果您无法打开文件，您应该稍后再试。

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using 块为阅读器完成时，文件句柄应该被关闭。

更新：

也许XmlReader.Create(string) 的行为并没有以最小的方式打开文件。如果这是导致异常的原因，请尝试使用此更明确的代码指定文件权限：

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);
}