如何在C＃中删除包含只读文件的目录？

这是一个扩展方法，它设置

Attributes

Normal

public static void DeleteReadonly(this FileSystemInfo fileSystemInfo){    var directoryInfo = fileSystemInfo as DirectoryInfo;        if (directoryInfo != null)    {        foreach (FileSystemInfo childInfo in directoryInfo.GetFileSystemInfos())        { childInfo.DeleteReadonly();        }    }    fileSystemInfo.Attributes = FileAttributes.Normal;    fileSystemInfo.Delete();}