MARKUS

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Web;

namespace Markus.Service.Helper

{

    public static class DownloadUri

    {

        public static string GetFileName(string uri)

        {

            string FileName = "";

            if (!uri.ToLower().Contains("filename") && uri.Contains("VPCS_DOCLIB"))

            {

                if (!Path.IsPathRooted(uri))

                {

                    FileName = uri.Remove(0, uri.LastIndexOf("/") + 1);

                }

                else

                {

                    FileName = uri.Remove(0, uri.LastIndexOf("\\") + 1);

                }

            }

            else if (uri.ToLower().Contains("filename") && !uri.Contains("VPCS_DOCLIB"))

            {

                FileName = HttpUtility.ParseQueryString(new Uri(uri).Query).Get("filename");

            }

            else

            {

                FileName = GetDownloadFileName(uri);

            }

            FileName = HttpUtility.UrlDecode(FileName);

            return FileName;

        }

        public static string GetDownloadFileName(string downloadUri)

        {

            string fileName = "";

            System.Net.WebClient wc = new System.Net.WebClient();

            var data = wc.DownloadData(downloadUri);

            if (!String.IsNullOrEmpty(wc.ResponseHeaders["Content-Disposition"]))

            {

                var contentDisposition = wc.ResponseHeaders["Content-Disposition"];

                fileName = GetFileNameInDisposition(new System.Net.Mime.ContentDisposition(contentDisposition));

            }

            else

            {

                var contenttype = wc.ResponseHeaders[System.Net.HttpResponseHeader.ContentType];

                if (contenttype == "application/pdf")

                {

                    fileName = downloadUri.Remove(0, downloadUri.LastIndexOf("/") + 1);

                }

            }

            return fileName;

        }

        private static string GetFileNameInDisposition(System.Net.Mime.ContentDisposition contentDisposition)

        {

            if (contentDisposition.FileName != null)

            {

                return contentDisposition.FileName;

            }

            var fileName = contentDisposition.Parameters["filename*"];

            if (fileName == null)

            {

                return null;

            }

            var pos = fileName.IndexOf("''", StringComparison.InvariantCulture);

            var encoding = Encoding.UTF8;

            if (pos >= 0)

            {

                try

                {

                    encoding = Encoding.GetEncoding(fileName.Substring(0, pos));

                }

                catch (ArgumentException)

                {

                }

                fileName = fileName.Substring(pos + 2);

            }

            return HttpUtility.UrlDecode(fileName, encoding);

        }

    }

}