System.IO.File.Move - 如何等待移动完成？

Question

我在c#中编写一个WPF应用程序,我需要移动一些文件 - 我真的需要知道文件是否成功.为此,我编写了一个检查,确保文件在移动后到达目标目录 - 问题是有时我会在文件完成移动之前进行检查:

   System.IO.File.Move(file.FullName, endLocationWithFile);

            System.IO.FileInfo[] filesInDirectory = endLocation.GetFiles();
            foreach (System.IO.FileInfo temp in filesInDirectory)
            {
                if (temp.Name == shortFileName)
                {

                    return true;
                }
            }

            // The file we sent over has not gotten to the correct   directory....something went wrong!
            throw new IOException("File did not reach destination");

        }
        catch (Exception e)
        {
            //Something went wrong, return a fail;
            logger.writeErrorLog(e);
            return false;
        }

有人可以告诉我如何确保文件实际到达目的地吗？ - 我将要移动的文件可能非常大 - (全高清mp4文件长达2小时)

谢谢!

Answer 1

您可以使用流Aysnc Await来确保文件完全复制

这样的事情应该有效:

private void Button_Click(object sender, RoutedEventArgs e)
{
    string sourceFile = @"\\HOMESERVER\Development Backup\Software\Microsoft\en_expression_studio_4_premium_x86_dvd_537029.iso";
    string destinationFile = "G:\\en_expression_studio_4_premium_x86_dvd_537029.iso";

    MoveFile(sourceFile, destinationFile);
}

private async void MoveFile(string sourceFile, string destinationFile)
{
    try
    {
        using (FileStream sourceStream = File.Open(sourceFile, FileMode.Open))
        {
            using (FileStream destinationStream = File.Create(destinationFile))
            {
                await sourceStream.CopyToAsync(destinationStream);
                if (MessageBox.Show("I made it in one piece :), would you like to delete me from the original file?", "Done", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
                {
                    sourceStream.Close();
                    File.Delete(sourceFile);
                }
            }
        }
    }
    catch (IOException ioex)
    {
        MessageBox.Show("An IOException occured during move, " + ioex.Message);
    }
    catch (Exception ex)
    {
        MessageBox.Show("An Exception occured during move, " + ex.Message);
    }
}

如果您使用的是VS2010,则必须安装Async CTP才能使用新的Async/Await语法