C# 获取网络路径文件大小信息的方法

做一个获取网络文件的大小信息的小软件，由于我的电脑上网使用的是HTTP代理，所以FTp部分是不能测试代码的可行性，所以先把代码贴出来：

//输入返回文件信息，包括文件名，格式，大小，以及其他信息

private string GetInfo(string URL)

{

    string Results = "";

    string filetype = URL.Substring(URL.LastIndexOf(".") + 1,

    (URL.Length - URL.LastIndexOf(".") - 1));

    Results = "类型：" + filetype.ToUpper();

    string filename = URL.Substring(URL.LastIndexOf("/") + 1,

    (URL.Length - URL.LastIndexOf("/") - 1));

    Results += "|名称：" + filename;

    long ContentL = 0;

    if (URL.ToLower().StartsWith("http://"))

    {

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);



        request.MaximumAutomaticRedirections = 4;

        request.MaximumResponseHeadersLength = 4;

        request.Credentials = CredentialCache.DefaultCredentials;

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        ContentL = response.ContentLength;

        response.Close();



        Results += "|大小：" + GetSize(ContentL) + "|额外信息：" + response.Server;



    }

    else if (URL.ToLower().StartsWith("ftp://"))

    {



        FtpWebRequest request = (FtpWebRequest)WebRequest.Create(URL);

        request.Method = WebRequestMethods.Ftp.GetFileSize;

        request.UseBinary = true;

        FtpWebResponse response = null;

        response = (FtpWebResponse)request.GetResponse();

        Stream Fs = response.GetResponseStream();

        ContentL = response.ContentLength;

        Fs.Close();

        response.Close();



        Results += "|大小：" + GetSize(ContentL) + "|额外信息：" + response.WelcomeMessage;

    }

    else

    {

        Results += "|大小：无法检测";

    }



    return Results;

}

//大小转化

private string GetSize(long L)

{

    float result;

    string re = "";

    if (L >= 1073741824)

    {

        result = L / 1073741824.00F;

        re = "GB";

    }

    else if (L >= 1048576)

    {

        result = L / 1048576.00F;

        re = "MB";

    }

    else

    {

        result = L / 1024.00F;

        re = "KB";

    }

    string File_Size = result.ToString("0.00");

    return (File_Size + re);

}

比如像这样的路径是很容易获取信息的：

http://download.hunantv.com/tv/imgotv_1.0.5.5938.exe

但是对于FTP测试的我没有条件测试。