文件系统观察程序和大文件

Question

var fsw = new FileSystemWatcher(sPath, "*.PPF");
fsw.NotifyFilter = NotifyFilters.FileName;
fsw.IncludeSubdirectories = true;
fsw.Created += FswCreated;
fsw.EnableRaisingEvents = true;

static void FswCreated(object sender, FileSystemEventArgs e)
{
  string sFile = e.FullPath;
  string[] arrLines = File.ReadAllLines(sFile);
}

这对于大文件失败,因为编写文件时没有完成该过程.该文件是通过网络复制的,所以我不知道文件的大小.需要什么样的同步才能使其稳健？

Answer 1

在stackoverflow上找到解决方案并对其进行了一些修改.

static bool IsFileLocked(FileInfo file)
{
    FileStream stream = null;

    try
    {
        stream = file.Open(FileMode.Open, 
                 FileAccess.ReadWrite, FileShare.None);
    }
    catch (IOException)
    {
        //the file is unavailable because it is:
        //still being written to
        //or being processed by another thread
        //or does not exist (has already been processed)
        return true;
    }
    finally
    {
        if (stream != null)
            stream.Close();
    }

    //file is not locked
    return false;
}

static void FswCreated(object sender, FileSystemEventArgs e)
{
    string sFile = e.FullPath;

    Console.WriteLine("processing file : " + sFile);

    // Wait if file is still open
    FileInfo fileInfo = new FileInfo(sFile);
    while(IsFileLocked(fileInfo))
    {
        Thread.Sleep(500);
    }

    string[] arrLines = File.ReadAllLines(sFile);
}