asp.net 得到一个文件夹下的所有文件夹及子文件夹名，得到所有文件名，文件大小，文件夹大小

using System.IO;
///

/// 获取指定目录下的所有文件夹名
///

/// 目录路径
/// string，返回所有文件夹名字
public string GetAllFolder(string path)
{
string folder_Names = "";
DirectoryInfo dir = new DirectoryInfo(path);

foreach (DirectoryInfo subdir in dir.GetDirectories())
folder_Names += subdir.FullName + ",";

return folder_Names;
}


///

/// 获取指定目录下的所有文件和文件夹大小
///

/// 目录路径
/// string，返回所有文件夹名字
protected long GetDirectorySize(string path)
{
long dirSize = 0;
DirectoryInfo dir = new DirectoryInfo(path);
foreach (FileInfo file in dir.GetFiles())
dirSize += file.Length;
foreach (DirectoryInfo subdir in dir.GetDirectories())
dirSize += GetDirectorySize(subdir.FullName);
return dirSize;
}