WebClient (.net 4.6) to HttpClient (.net core)

Question

Could anyone please help me convert this code snippet to it's .net core equivalent?

        Uri uri = new Uri(url);
        string filename = System.IO.Path.GetFileName(uri.LocalPath);
        string extension = Path.GetExtension(filename);

        string tempFilepath = Path.GetTempFileName() + extension;

        try
        {
            WebClient webClient = new WebClient();
            webClient.DownloadFile(url, tempFilepath);

            if (new FileInfo(tempFilepath).Length > 0)
            {
                return tempFilepath;
            }
            else {
                return null;
            }

        }
        catch (WebException e)
        {
            return null;
        }
        catch (NotSupportedException e)
        {
            return null;
        }

Actually, this code was previously in an application which was writte in .net 4.6. Then some time ago, we stopped using that app. Now I am developing another app in .net core and will be doing exact same thing. So I wonder how would I do this using .net core? What is the alternate to DownloadFile method in HttpClient?

Not sure why people are down voting this. @Syed did the diligence to write code out himself, and this question is about the changes in the .NET Core framework more than asking for a handout. — Ryan Mendoza
– Ryan Mendoza, Commented May 26, 2017 at 16:37

Community · Accepted Answer · 2017-05-23 11:46:42Z

3

This should do it...

try
{
    using (var client = new HttpClient())
    {
        using (HttpResponseMessage response = client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead).Result)
        {
            response.EnsureSuccessStatusCode();

            using (Stream contentStream = response.Content.ReadAsStreamAsync().Result, fileStream = new FileStream(tempFilepath, FileMode.Create, FileAccess.Write, FileShare.None, 8192, true))
            {
                var buffer = new byte[8192];
                var isMoreToRead = true;

                do
                {
                    var read = contentStream.ReadAsync(buffer, 0, buffer.Length).Result;
                    if (read == 0)
                    {
                        isMoreToRead = false;
                    }
                    else
                    {
                        fileStream.WriteAsync(buffer, 0, read);
                    }
                }

                while (isMoreToRead);
            }
        }
    }

Or you could implement this more cleanly like so: How to implement progress reporting for Portable HttpClient

edited May 23, 2017 at 11:46

CommunityBot

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answered Mar 27, 2017 at 15:24

Ryan Mendoza

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3 Comments

Syed Over a year ago

Thank you very much Ryan! This is exactly what I was looking for. Worked like a charm. Hats off!!

Ryan Mendoza Over a year ago

@Syed if your method is async, I would recommend awaiting the ReadAsStreamAsync and ReadAsync instead of doing .Result.

Syed Over a year ago

yes, I already changed it to that. But thanks for the hint :)

Kifayat Ullah · Accepted Answer · 2017-08-08 19:00:01Z

0

A more simpler way of doing it is ...

        HttpClient client = new HttpClient();
        try
        {
            var response =  client.GetStringAsync(url);
            Console.WriteLine(response.Result);
        }
        catch (Exception e)
        {
            Console.WriteLine("Message :{0} ", e.Message);
        }
        finally{
            client.Dispose();
        }

Target Framework : netcoreapp1.1
Editor : Visual Studio Code
Application Type : Console application

answered Aug 8, 2017 at 19:00

Kifayat Ullah

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