CODEWITHSUNDEEP
asp.net.netasp.net-mvcasp.net-web-api
Water Cooler v2
Water Cooler v2

Reputation: 33880

'System.Net.Http.HttpContent' does not contain a definition for 'ReadAsAsync' and no extension method

I made a console app to consume a Web API I just made. The console app code does not compile. It gives me the compilation error:

'System.Net.Http.HttpContent' does not contain a definition for 
'ReadAsAsync' and no extension method 'ReadAsAsync' accepting a 
first argument of type 'System.Net.Http.HttpContent' could be 
found (are you missing a using directive or an assembly reference?)

Here's a test method in which this error occurs.

static IEnumerable<Foo> GetAllFoos()
{
  using (HttpClient client = new HttpClient())
  {
    client.DefaultRequestHeaders.Add("appkey", "myapp_key");

    var response = client.GetAsync("http://localhost:57163/api/foo").Result;

    if (response.IsSuccessStatusCode)
      return response.Content.ReadAsAsync<IEnumerable<Foo>>().Result.ToList();
  }

  return null;
}

I have used this method and consumed it from an MVC client.

Upvotes: 135

Views: 162907

Answers (8)

Hisham Shahid
Hisham Shahid

Reputation: 305

Install below package from nuget enter image description here

Upvotes: 5

Natalija
Natalija

Reputation: 41

Had the same issue, but proposed answers didn't help, installing System.Net.Http.Json package removed the error.

Upvotes: 4

Kasun Ganganath Rathnasekara
Kasun Ganganath Rathnasekara

Reputation: 609

  • if you unable to find assembly reference from when (Right click on reference ->add required assembly)

try this Package manager console
Install-Package System.Net.Http.Formatting.Extension -Version 5.2.3 and then add by using add reference .

Upvotes: 39

Debendra Dash
Debendra Dash

Reputation: 5626

USE This Assembly Referance in your Project

Add a reference to System.Net.Http.Formatting.dll

Upvotes: -2

Conor Kelly
Conor Kelly

Reputation: 261

Adding a reference to System.Net.Http.Formatting.dll may cause DLL mismatch issues. Right now, System.Net.Http.Formatting.dll appears to reference version 4.5.0.0 of Newtonsoft.Json.DLL, whereas the latest version is 6.0.0.0. That means you'll need to also add a binding redirect to avoid a .NET Assembly exception if you reference the latest Newtonsoft NuGet package or DLL: 

<dependentAssembly>
   <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
 </dependentAssembly>

So an alternative solution to adding a reference to System.Net.Http.Formatting.dll is to read the response as a string and then desearalize yourself with JsonConvert.DeserializeObject(responseAsString). The full method would be: 

public async Task<T> GetHttpResponseContentAsType(string baseUrl, string subUrl)
{
     using (var client = new HttpClient())
     {
         client.BaseAddress = new Uri(baseUrl);
         client.DefaultRequestHeaders.Accept.Clear();
         client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

         HttpResponseMessage response = await client.GetAsync(subUrl);
         response.EnsureSuccessStatusCode();
         var responseAsString = await response.Content.ReadAsStringAsync();
         var responseAsConcreteType = JsonConvert.DeserializeObject<T>(responseAsString);
         return responseAsConcreteType;
      }
}

Upvotes: 15

Darin Dimitrov
Darin Dimitrov

Reputation: 1039110

Make sure that you have installed the correct NuGet package in your console application:

<package id="Microsoft.AspNet.WebApi.Client" version="4.0.20710.0" />

and that you are targeting at least .NET 4.0.

This being said, your GetAllFoos function is defined to return an IEnumerable<Prospect> whereas in your ReadAsAsync method you are passing IEnumerable<Foo> which obviously are not compatible types.

Install-Package Microsoft.AspNet.WebApi.Client

Select project in project manager console

Upvotes: 137

Ram
Ram

Reputation: 91

or if you have VS 2012 you can goto the package manager console and type Install-Package Microsoft.AspNet.WebApi.Client

This would download the latest version of the package

Upvotes: 9

Water Cooler v2
Water Cooler v2

Reputation: 33880

After a long struggle, I found the solution.

Solution: Add a reference to System.Net.Http.Formatting.dll. This assembly is also available in the C:\Program Files\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies folder.

The method ReadAsAsync is an extension method declared in the class HttpContentExtensions, which is in the namespace System.Net.Http in the library System.Net.Http.Formatting.

Reflector came to rescue!

Upvotes: 168

Related Questions