[英]C# WebClient.UploadFileAsync Cannot access the file because it's being used by another process
我正在构建一个简单的应用程序,它将计算机上的文件夹与远程服务器同步。 我使用FileSystelWatcher来检测更改,并使用WebClient上载文件。 问题是,当我尝试上传时,出现异常,表明该文件已被使用。 我检查了所有进程,但找不到阻塞的进程。 当将多个文件添加到目录中时,我也尝试了FileSystemWatcher的此文件访问错误,但问题仍然相同。 这是我声明FileSysemWatcher的方式:
private void InitFileWatcher()
{
try
{
watcher = new FileSystemWatcher();
watcher.Path = FileManager.getSyncDirPath();
watcher.EnableRaisingEvents = true;
watcher.IncludeSubdirectories = true;
watcher.Created += FileManager.FileCreated;
}
catch(Exception)
{
Console.WriteLine("Error");
}
}
FileManager.FileCreated方法:
public static void FileCreated(object sender, FileSystemEventArgs e)
{
Console.WriteLine("File created: " + e.FullPath);
while (true)
{
try
{
using (Stream stream = System.IO.File.Open(e.FullPath, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
{
if (stream != null)
{
FileUploader uploader = new FileUploader();
uploader.Upload(e.FullPath, new Uri("http://192.168.65.1/test/upload.php"));
break;
}
}
}
catch (FileNotFoundException ex)
{
System.Diagnostics.Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", e.FullPath, ex.Message));
}
catch (IOException ex)
{
System.Diagnostics.Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", e.FullPath, ex.Message));
}
catch (UnauthorizedAccessException ex)
{
System.Diagnostics.Trace.WriteLine(string.Format("Output file {0} not yet ready ({1})", e.FullPath, ex.Message));
}
Thread.Sleep(500);
}
}
最后是上传方法:
public void Upload(string file, Uri destination)
{
WebClient client = new WebClient();
client.Headers.Add("Content-Type", "binary/octet-stream");
client.UploadFileAsync(destination, "POST", file);
}
谢谢您的帮助 ! :)
它不会让您上传文件,因为已经使用System.IO.File.Open
打开了文件
如果您打开文件只是为了检查其存在,则可以使用
File.Exists(path);
您必须尝试下面提到的代码。
public void Upload(string file, Uri destination)
{
using (WebClient client=new Webclient())
{
client.Headers.Add("Content-Type", "binary/octet-stream");
client.UploadFileAsync(destination, "POST", file);
}
}
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