等待文件完全写入

对于您面临的问题，只有解决方法。

开始复制之前，请检查文件ID是否正在处理中。您可以调用以下函数，直到获得False值为止。

第一种方法，直接从此 答案复制：

private 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;}

第二种方法：

const int ERROR_SHARING_VIOLATION = 32;const int ERROR_LOCK_VIOLATION = 33;private bool IsFileLocked(string file){    //check that problem is not in destination file    if (File.Exists(file) == true)    {        FileStream stream = null;        try        { stream = File.Open(file, FileMode.Open, FileAccess.ReadWrite, FileShare.None);        }        catch (Exception ex2)        { //_log.WriteLog(ex2, "Error in checking whether file is locked " + file); int errorCode = Marshal.GetHRForException(ex2) & ((1 << 16) - 1); if ((ex2 is IOException) && (errorCode == ERROR_SHARING_VIOLATION || errorCode == ERROR_LOCK_VIOLATION)) {     return true; }        }        finally        { if (stream != null)     stream.Close();        }    }    return false;}