‘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.


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

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 FilesMicrosoft ASP.NETASP.NET MVC 4Assemblies 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!

Method 2

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

Method 3

  • 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 .

Method 4

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 of Newtonsoft.Json.DLL, whereas the latest version is 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:

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

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.Add(new MediaTypeWithQualityHeaderValue("application/json"));

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

Method 5

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

Method 6

Install below package from nuget
'System.Net.Http.HttpContent' does not contain a definition for 'ReadAsAsync' and no extension method

Method 7

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

Method 8

USE This Assembly Referance in your Project

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

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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