使用DirectoryInfo的GetDirectories方法。

foreach (DirectoryInfo subDir in new DirectoryInfo(targetDir).GetDirectories())
                    subDir.Delete(true);

以下代码将递归清除文件夹：

private void clearFolder(string FolderName)
{
    DirectoryInfo dir = new DirectoryInfo(FolderName);

    foreach(FileInfo fi in dir.GetFiles())
    {
        fi.Delete();
    }

    foreach (DirectoryInfo di in dir.GetDirectories())
    {
        clearFolder(di.FullName);
        di.Delete();
    }
}

System.IO.Directory.Delete(installPath, true);
System.IO.Directory.CreateDirectory(installPath);

下面的示例显示了如何做到这一点。它首先创建一些目录和文件，然后通过Directory.Delete（topPath，true）；：

    static void Main(string[] args)
    {
        string topPath = @"C:\NewDirectory";
        string subPath = @"C:\NewDirectory\NewSubDirectory";

        try
        {
            Directory.CreateDirectory(subPath);

            using (StreamWriter writer = File.CreateText(subPath + @"\example.txt"))
            {
                writer.WriteLine("content added");
            }

            Directory.Delete(topPath, true);

            bool directoryExists = Directory.Exists(topPath);

            Console.WriteLine("top-level directory exists: " + directoryExists);
        }
        catch (Exception e)
        {
            Console.WriteLine("The process failed: {0}", e.Message);
        }
    }

它取自https://msdn.microsoft.com/en-us/library/fxeahc5f（v=vs.110）.aspx。

在我的情况下

var PhotoFile = _context.Records.Where(x => id_or_ids.Contains(x.Id)).Select(x => x.Photo).ToList();

            System.IO.DirectoryInfo di = new DirectoryInfo("wwwroot/uploads");

            foreach (FileInfo file in di.GetFiles())
            {
                if (PhotoFile.IndexOf(file.Name) != -1)
                {
                    file.Delete();
                }
            }

使用DirectoryInfo的GetDirectories方法。

foreach (DirectoryInfo subDir in new DirectoryInfo(targetDir).GetDirectories())
                    subDir.Delete(true);