HttpConent does not contain a definition for ReadAsAsync and no accessible extension method ReadAsAync accepting a first argument of type HttpContent could be found

Question

User-973886032 posted

hi guys

I have a web API project that uses a HTTPRequest class to get a remote JSON result file and pass to the calling app. However I want to encapsulate the functionality of the request in an a class Project and make references to both the webAPI Project and main website, using a class, but it keeps giving errors. 

Here is my working code.  WebAPI Project ( This works fine )

private const string URL = "test"; 
[HttpGet]
        public async Task<ActionResult<IEnumerable<ORDERS>>> GetORDERS()
        {

            HttpClient client = new HttpClient();
            client.BaseAddress = new Uri(URL);

            // Add an Accept header for JSON format.
            client.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));

            // List data response.
            HttpResponseMessage response = client.GetAsync(urlParameters).Result;  // Blocking call! Program will wait here until a response is received or a timeout occurs.
            if (response.IsSuccessStatusCode)
            {
                // Parse the response body.
                var dataObjects = response.Content.ReadAsAsync<IEnumerable<DataObject>>().Result;  //Make sure to add a reference to System.Net.Http.Formatting.dll
                foreach (var d in dataObjects)
                {
                    var x = ("{0}", "MMT");
                }
            }
            else
            {
                var x = ("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
            }
            return await _context.ORDERS.ToListAsync();
        }

However when I add it to a class, I get the error

Severity	Code	Description	Project	File	Line	Suppression State
Error	CS1061	'HttpContent' does not contain a definition for 'ReadAsAsync' and no accessible extension method 'ReadAsAsync' accepting a first argument of type 'HttpContent' could be found (are you missing a using directive or an assembly reference?)	NetWealth.Services	C:\****GetTodaysRates.cs	73	Active

HttpConent does not contain a definition for ReadAsAsync and no accessible extension method ReadAsAync accepting a first argument of type HttpContent could be found 

Answer 1

User475983607 posted

However when I add it to a class, I get the error

Severity Code Description Project File Line Suppression State Error CS1061 'HttpContent' does not contain a definition for 'ReadAsAsync' and no accessible extension method 'ReadAsAsync' accepting a first argument of type 'HttpContent' could be found (are you missing a using directive or an assembly reference?) NetWealth.Services C:\****GetTodaysRates.cs 73 Active

The class is missing a reference to the legacy class; System.Net.Http.Formatting.

You should use Microsoft.AspNet.WebApi.Client with .NET Core.

https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpclient?view=net-5.0

Answer 2

User-973886032 posted

thank you

sometimes these nuget packages do my head in