异步复制目录及其内容

Question

我发现this solution on MSDN可以将文件从一个目录复制到另一个目录，但它只能从主目录复制，而不能从子目录复制。

如何修改此解决方案，使其同时复制所有文件夹及其内容？

string StartDirectory = @"C:\Users\...";
string EndDirectory = @"C:\Users\....";

 //Creates all of the directories and sub-directories
foreach (string dirPath in Directory.GetDirectories(StartDirectory, "*", SearchOption.AllDirectories))
    Directory.CreateDirectory(dirPath.Replace(StartDirectory, EndDirectory));

foreach (string filename in Directory.EnumerateFiles(StartDirectory))
{
       using (FileStream SourceStream = File.Open(filename, FileMode.Open))
       {
             using (FileStream DestinationStream = File.Create(EndDirectory + filename.Substring(filename.LastIndexOf('\\'))))
             {
                  await SourceStream.CopyToAsync(DestinationStream);
              }
        }
}

Answer 1

用两个循环解决了这个问题，一个循环用于所有子目录(第一个)，另一个循环用于主目录：

foreach (string dirPath in Directory.GetDirectories(StartDirectory, "*", SearchOption.AllDirectories))
            {
                Directory.CreateDirectory(dirPath.Replace(StartDirectory, EndDirectory));
                foreach (string filename in Directory.EnumerateFiles(dirPath))
                {
                    using (FileStream SourceStream = File.Open(filename, FileMode.Open))
                    {
                        using (FileStream DestinationStream = File.Create(filename.Replace(StartDirectory, EndDirectory)))
                        {

                            await SourceStream.CopyToAsync(DestinationStream);

                        }
                    }
                }
            }

            foreach (string filename in Directory.EnumerateFiles(StartDirectory))
            {
                using (FileStream SourceStream = File.Open(filename, FileMode.Open))
                {
                    using (FileStream DestinationStream = File.Create(EndDirectory + filename.Substring(filename.LastIndexOf('\\'))))
                    {

                        await SourceStream.CopyToAsync(DestinationStream);
                    }
                }
            }

Answer 2

展开第一个循环以包含内部循环，它应该可以工作。您正在使用第一个for循环搜索所有文件夹，但仅枚举顶级文件夹中的文件。您还需要枚举每个子文件夹中的文件。此外，在这种情况下，DirectoryInfo将比目录更容易使用。

DirectoryInfo StartDirectory = new DirectoryInfo(@"C:\Users\...");
DirectoryInfo EndDirectory = new DirectoryInfo(@"C:\Users\....");

//Creates all of the directories and sub-directories
foreach (DirectoryInfo dirInfo in StartDirectory.GetDirectories("*", SearchOption.AllDirectories))
{
    string dirPath = dirInfo.FullName;
    string outputPath = dirPath.Replace(StartDirectory.FullName, EndDirectory.FullName);
    Directory.CreateDirectory(outputPath);

    foreach (FileInfo file in dirInfo.EnumerateFiles())
    {
        using (FileStream SourceStream = file.OpenRead())
        {
            using (FileStream DestinationStream = File.Create(outputPath + file.Name))
            {
                SourceStream.CopyToAsync(DestinationStream);
            }
        }
    }
}