c# 递归删除文件夹下的所有文件

private void DeleteInDir(string szDirPath)
        {
            if (szDirPath.Trim() == "" || !Directory.Exists(szDirPath))
                return;
            DirectoryInfo dirInfo = new DirectoryInfo(szDirPath);

            FileInfo[] fileInfos = dirInfo.GetFiles();
            if (fileInfos != null && fileInfos.Length > 0)
            {
                foreach (FileInfo fileInfo in fileInfos)
                {
                    //DateTime.Compare( fileInfo.LastWriteTime,DateTime.Now);
                    File.Delete(fileInfo.FullName); //删除文件
                }
            }

            DirectoryInfo[] dirInfos = dirInfo.GetDirectories();
            if (dirInfos != null && dirInfos.Length > 0)
            {
                foreach (DirectoryInfo childDirInfo in dirInfos)
                {
                    this.DeleteInDir(childDirInfo); //递归
                }
            }
            //Directory.Delete(dirInfo.FullName, true); //删除目录
        }