Cannot instantiate System.Net.Http.HttpClientHandler on Windows 8.1

Question

I have a piece of code that uses System.Net.Http Library. and when ever I create new instance of System.Net.Http.HttpClientHandler an Exception occures , For Example:

    private async void btnTest_Click(object sender, RoutedEventArgs e)
    {
        var handler = new System.Net.Http.HttpClientHandler();
        //default constructor does the same thing :this(new HttpClientHandler())
        var client = new System.Net.Http.HttpClient(handler);
        var resp = (await client.GetAsync("any url"));
        var content = resp.Content;
    }

and the Exception is :

System.TypeLoadException: Could not load type
'System.Security.Authentication.SslProtocols' from assembly 
'System.Net.Primitives, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a'.

   at System.Net.Http.HttpClientHandler..ctor()
   at MyApp.MainWindow.<btnTest_Click>d__0.MoveNext() in c:\MyApp\MainWindow.xaml.cs:line 30

I tested the code on win 7, no exception thrown, but whatever i tried on win8.1 the same exception was thrown.

Barnstokkr · Accepted Answer · 2015-07-21 15:36:36Z

The System.Net.Http.HttpClient, System.Net.Http.HttpClientHandler and System.Net.Http.HttpResponseMessage implements the IDisposable interface, and should be disposed; typically you would put them in using blocks.

using(var handler = new System.Net.Http.HttpClientHandler())
{ 
    using(var client = new System.Net.Http.HttpClient(handler))
    {
       using(var resp = (await client.GetAsync("any url")))
       {
            var content = resp.Content;
       }
    }
}

Anyway... I don't think this will solve your problem :P

I think you are using VS2015 RC, this appears to be a common issue on that version.
However, it is recommended for Windows 8.1 WinRT to use the Windows.Web.Http.HttpClient, which works a little bit different than System.Net.Http one.

Using the Windows.Web.Http namespace:

using (Windows.Web.Http.Filters.HttpBaseProtocolFilter filter = new Windows.Web.Http.Filters.HttpBaseProtocolFilter())
{
     using (Windows.Web.Http.HttpClient client = new Windows.Web.Http.HttpClient(filter))
     {
          using (Windows.Web.Http.HttpResponseMessage resp = await client.GetAsync(new Uri("Any Uri")))
          {
               var content = resp.Content;
          }
      }
}

Last, you have set the Capabilities in the Package.appxmanifest to allow Internet access.

Hope this helps. Good luck!

Collectives™ on Stack Overflow

Cannot instantiate System.Net.Http.HttpClientHandler on Windows 8.1

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related