Can not use HttpClient from Asp MVC 6 Web Api

Question

I try to write simple code:

 public async Task<string> GetData(String labelName)
    {           
        using (var client = new HttpClient())
        {
            var uri = new Uri(@"https://example.com/over/search_field?=search_label=" + labelName);

            var response = await client.GetAsync(uri).ConfigureAwait(false);
            var textResult = await response.Content.ReadAsStringAsync();
            return textResult;
        }
    }

At project.json:

 {
"webroot": "wwwroot",
"version": "1.0.0-*",
"dependencies": {
  "Microsoft.AspNet.IISPlatformHandler": "1.0.0-beta8",
 "Microsoft.AspNet.Mvc": "6.0.0-beta8",
 "Microsoft.AspNet.Server.Kestrel": "1.0.0-beta8",
 "Microsoft.AspNet.StaticFiles": "1.0.0-beta8",

 "Microsoft.Framework.Logging": "1.0.0-beta8",
 "Microsoft.Framework.Logging.Console": "1.0.0-beta8",
 "Microsoft.Framework.Logging.Debug": "1.0.0-beta8",
 "Microsoft.Net.Http": "2.2.22"
  },      
 "frameworks": {
  "dnx451": {
    "dependencies": {
       "Microsoft.AspNet.WebApi.Client": "5.2.3",
      "Microsoft.AspNet.WebApi.Owin": "5.2.3",
      "System.Net.Http": "4.0.1-beta-23409"


   },
   "frameworkAssemblies": {
     "System.Net": "4.0.0.0",
     "System.Net.Http": "4.0.0.0"
   }
 },
 "dnxcore50": { }
},

But, when i try to build code i get error:

Error CS0246 The type or namespace name 'HttpClient' could not be found (are you missing a using directive or an assembly reference?)

Can you help me? How to fix this error? I use VS 2015 and ASP MVC 6 Web API. Thank you!

Try moving "dependencies" outside of the "frameworks". I assume your application could not be compiled when targeting dnxcore50? — Nikolay Kostov
– Nikolay Kostov, Commented Dec 13, 2015 at 15:52

Shyju · Accepted Answer · 2015-12-13 16:56:57Z

5

This worked for me. I added System.Net.Http to the dependencies section and built the project (thus restored this new dependency in both DNX 4.5.1 and DNX Core 5.0)

"dependencies": {
    "Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    // Removed some dependencies for saving space:)
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc1-final",
    "System.Net.Http": "4.0.1-beta-23409"
},
"frameworks": {
    "dnx451": { },
    "dnxcore50": {}
},

Verified in the below runtimes and it works fine.

coreclr - X86 - 1.0.0-rc1-update1
coreclr - X64 - 1.0.0-rc1-update1
clr - X86 - 1.0.0-rc1-update1
clr - X64 - 1.0.0-rc1-update1

Also, you need to make sure that you have the using directive which imports the System.Net.Http namespace in the class file where you have your GetData method.

using System.Net.Http;

answered Dec 13, 2015 at 16:56

Shyju

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1 Comment

Jim Evans Over a year ago

Thank you - using rc1-update1 x64 and solved my issue.

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