FileSystemWatcher 读取文件时出现被占用的解决方法

今天做一个小程序监控目录并序列化XML时遇到第一次正常，第二个新文件加入时出现文件被占用的错误，记录下解决方法。

FileSystemWatcher watcher = new FileSystemWatcher{
                Path = path,
                Filter = filter,
                EnableRaisingEvents = true,
                IncludeSubdirectories = true,
                NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName |
                    NotifyFilters.FileName | NotifyFilters.LastAccess
                    | NotifyFilters.LastWrite | NotifyFilters.Security | NotifyFilters.Size
            };
            watcher.Created += OnCreated;

private static void OnCreated(object source, FileSystemEventArgs e)
        {
            Console.WriteLine("Got a new file " + e.Name);

                #region === 读取文件内容 ===
                string xmlStr = string.Empty;
                while (true)
                {
                    try
                    {
                        using (Stream stream = File.Open(e.FullPath, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
                        {
                            if (stream != null)
                                break;
                        }
                        System.Threading.Thread.Sleep(500);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(string.Format("Output file {0} not yet ready ({1})", e.Name, ex.Message));
                    }
                }

                using (FileStream fs = new FileStream(e.FullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                {
                    using (StreamReader sr = new StreamReader(fs, Encoding.Default))
                    {
                        xmlStr = sr.ReadToEnd();
                    }
                }
                #endregion
        }

主要原因是文件还在写入过程中，还被占用，所以不能读取，以下代码为核心解决方法：

while (true)
                 {
                     try
                     {
                         using (Stream stream = File.Open(e.FullPath, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
                         {
                             if (stream != null)
                                 break;
                         }
                         System.Threading.Thread.Sleep(500);
                     }
                     catch (Exception ex)
                     {
                         Console.WriteLine(string.Format("Output file {0} not yet ready ({1})", e.Name, ex.Message));
                     }
                 }

 提示：如果是以windows 服务的形式访问网络文件时，不能通知映射盘符的方式,必须是以IP或者hostname方式，比如不能是Z：\abc\,必须为\192.168.1.2abc