下载文件前通过HTTP请求获取文件大小代码,C#代码库,德仔网

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【C#】下载文件前通过HTTP请求获取文件大小

作者:俊达 / 发布于2019/9/5/ 310

public static string GetInfo(string URL)
 
        {
            string Results = "";
 
            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 +=  GetSize(ContentL);
 
 
            }
 
            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 += GetSize(ContentL);
 
            }
 
            else
 
            {
 
                Results += "无法检测";
 
            }
 
 
 
            return Results;
 
        }
 
        //大小转化??
 
        public static 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);
 
        }

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