你不必创建一个额外的递归方法或删除额外文件夹内的文件。这些都是通过调用自动完成的

DirectoryInfo.Delete ();

详情在这里。

像这样的东西效果很好:

  var directoryInfo = new DirectoryInfo("My directory path");
    // Delete all files from app data directory.

    foreach (var subDirectory in directoryInfo.GetDirectories())
    {
          subDirectory.Delete(true);// true set recursive paramter, when it is true delete sub file and sub folder with files too
    }

将true作为变量传递给delete方法，将删除包含文件的子文件和子文件夹。

目录或文件处于锁定状态，不能被删除。找到锁它的罪魁祸首，看看你是否能消除它。

编者注:尽管这个答案包含了一些有用的信息，但关于Directory.Delete的工作原理实际上是不正确的。请阅读这个答案的评论，以及这个问题的其他答案。

我以前遇到过这个问题。

The root of the problem is that this function does not delete files that are within the directory structure. So what you'll need to do is create a function that deletes all the files within the directory structure then all the directories before removing the directory itself. I know this goes against the second parameter but it's a much safer approach. In addition, you will probably want to remove READ-ONLY access attributes from the files right before you delete them. Otherwise that will raise an exception.

只需将这些代码放入您的项目中。

public static void DeleteDirectory(string target_dir)
{
    string[] files = Directory.GetFiles(target_dir);
    string[] dirs = Directory.GetDirectories(target_dir);

    foreach (string file in files)
    {
        File.SetAttributes(file, FileAttributes.Normal);
        File.Delete(file);
    }

    foreach (string dir in dirs)
    {
        DeleteDirectory(dir);
    }

    Directory.Delete(target_dir, false);
}

另外，对我个人来说，我对允许删除的机器区域添加了一个限制，因为你希望有人在C:\ windows (%WinDir%)或C:\。

现代异步回答

公认的答案是完全错误的，它可能适用于某些人，因为从磁盘获取文件所花费的时间释放了锁定文件的任何东西。事实上，这是因为文件被其他进程/流/操作锁定了。其他答案使用Thread。Sleep (Yuck)在一段时间后重试删除目录。这个问题需要一个更现代的答案来重新审视。

public static async Task<bool> TryDeleteDirectory(
   string directoryPath,
   int maxRetries = 10,
   int millisecondsDelay = 30)
{
    if (directoryPath == null)
        throw new ArgumentNullException(directoryPath);
    if (maxRetries < 1)
        throw new ArgumentOutOfRangeException(nameof(maxRetries));
    if (millisecondsDelay < 1)
        throw new ArgumentOutOfRangeException(nameof(millisecondsDelay));

    for (int i = 0; i < maxRetries; ++i)
    {
        try
        {
            if (Directory.Exists(directoryPath))
            {
                Directory.Delete(directoryPath, true);
            }

            return true;
        }
        catch (IOException)
        {
            await Task.Delay(millisecondsDelay);
        }
        catch (UnauthorizedAccessException)
        {
            await Task.Delay(millisecondsDelay);
        }
    }

    return false;
}

单元测试

这些测试展示了一个被锁定的文件如何导致目录的示例。删除失败以及上面的TryDeleteDirectory方法如何修复这个问题。

[Fact]
public async Task TryDeleteDirectory_FileLocked_DirectoryNotDeletedReturnsFalse()
{
    var directoryPath = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
    var subDirectoryPath = Path.Combine(Path.GetTempPath(), "SubDirectory");
    var filePath = Path.Combine(directoryPath, "File.txt");

    try
    {
        Directory.CreateDirectory(directoryPath);
        Directory.CreateDirectory(subDirectoryPath);

        using (var fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.Write))
        {
            var result = await TryDeleteDirectory(directoryPath, 3, 30);
            Assert.False(result);
            Assert.True(Directory.Exists(directoryPath));
        }
    }
    finally
    {
        if (Directory.Exists(directoryPath))
        {
            Directory.Delete(directoryPath, true);
        }
    }
}

[Fact]
public async Task TryDeleteDirectory_FileLockedThenReleased_DirectoryDeletedReturnsTrue()
{
    var directoryPath = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
    var subDirectoryPath = Path.Combine(Path.GetTempPath(), "SubDirectory");
    var filePath = Path.Combine(directoryPath, "File.txt");

    try
    {
        Directory.CreateDirectory(directoryPath);
        Directory.CreateDirectory(subDirectoryPath);

        Task<bool> task;
        using (var fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.Write))
        {
            task = TryDeleteDirectory(directoryPath, 3, 30);
            await Task.Delay(30);
            Assert.True(Directory.Exists(directoryPath));
        }

        var result = await task;
        Assert.True(result);
        Assert.False(Directory.Exists(directoryPath));
    }
    finally
    {
        if (Directory.Exists(directoryPath))
        {
            Directory.Delete(directoryPath, true);
        }
    }
}

在Windows上，当目录(或任何子目录)中的文件路径长度大于260个符号时，就会出现此问题。

在这种情况下，您需要删除\\\\?\C:\mydir而不是C:\mydir。 大约260个符号的限制，你可以在这里阅读。

我在特尔斐也遇到过同样的问题。最终的结果是我自己的应用程序锁定了我想要删除的目录。不知何故，当我写入目录(一些临时文件)时，目录被锁定了。

问题在于，在删除它之前，我对它的父目录做了一个简单的更改。