Question

public IEnumerable<FTPListDetail> GetDirectoryListing(string rootUri)
        {
            var CurrentRemoteDirectory = rootUri;
            var result = new StringBuilder();
            var request = GetWebRequest(WebRequestMethods.Ftp.ListDirectoryDetails, CurrentRemoteDirectory);
            using (var response = request.GetResponse())
            {
                using (var reader = new StreamReader(response.GetResponseStream()))
                {
                    string line = reader.ReadLine();
                    while (line != null)
                    {
                        result.Append(line);
                        result.Append("\n");
                        line = reader.ReadLine();
                    }
                    if (string.IsNullOrEmpty(result.ToString()))
                    {
                        return new List<FTPListDetail>();
                    }
                    result.Remove(result.ToString().LastIndexOf("\n"), 1);
                    var results = result.ToString().Split('\n');
                    string regex =
                        @"^" +               //# Start of line
                        @"(?<dir>[\-ld])" +          //# File size          
                        @"(?<permission>[\-rwx]{9})" +            //# Whitespace          \n
                        @"\s+" +            //# Whitespace          \n
                        @"(?<filecode>\d+)" +
                        @"\s+" +            //# Whitespace          \n
                        @"(?<owner>\w+)" +
                        @"\s+" +            //# Whitespace          \n
                        @"(?<group>\w+)" +
                        @"\s+" +            //# Whitespace          \n
                        @"(?<size>\d+)" +
                        @"\s+" +            //# Whitespace          \n
                        @"(?<month>\w{3})" +          //# Month (3 letters)   \n
                        @"\s+" +            //# Whitespace          \n
                        @"(?<day>\d{1,2})" +        //# Day (1 or 2 digits) \n
                        @"\s+" +            //# Whitespace          \n
                        @"(?<timeyear>[\d:]{4,5})" +     //# Time or year        \n
                        @"\s+" +            //# Whitespace          \n
                        @"(?<filename>(.*))" +            //# Filename            \n
                        @"$";                //# End of line

                    var myresult = new List<FTPListDetail>();
                    foreach (var parsed in results)
                    {
                        var split = new Regex(regex)
                            .Match(parsed);
                        var dir = split.Groups["dir"].ToString();
                        var permission = split.Groups["permission"].ToString();
                        var filecode = split.Groups["filecode"].ToString();
                        var owner = split.Groups["owner"].ToString();
                        var group = split.Groups["group"].ToString();
                        var filename = split.Groups["filename"].ToString();
                        var size = split.Groups["size"].Length;
                        myresult.Add(new FTPListDetail()
                        {
                            Dir = dir,
                            Filecode = filecode,
                            Group = group,
                            FullPath = CurrentRemoteDirectory + "/" + filename,
                            Name = filename,
                            Owner = owner,
                            Permission = permission,
                        });
                    };
                    return myresult;
                }
            }
        }

我从ftp服务器获取文件和目录列表。

我从另一个方法中递归调用此方法，所以第一次在CurrentRemoteDirectory中获取根目录，然后从根目录和另一个子目录获取子目录，依此类推......

我的问题是我如何识别和使用第一次目录，我知道它是根，但程序将如何知道它的根？也许以某种方式使用标签？

Answer 1

创建另一个函数或者在测试rootUri的地方执行它，如果它是根目录，例如：

    public static bool IsRoot(string directory)
    {
        //Set the current directory - this can throw an exception either catch this here or outside.
        Directory.SetCurrentDirectory(directory);

        return Directory.GetDirectoryRoot(directory).Equals(Directory.GetCurrentDirectory());
    }

我怎么知道目录是否是根目录？

1 个答案: