Error retrieving data from Api Controller - asp.net

Question

I'm working on an ASP.NET Core Api and Xamarin forms client using Visual Studio 2017.
I'm getting an error
System.Runtime.Serialization.SerializationException: Invalid JSON string
because response.Content is null, when retrieving data from API but when paste this Url in browser "https://localhost:44305/api/Agreement/GetAgreementText/1" it shows data in the browser. When I run using client it's not hit to api method debug point .
Here is my APi method
[HttpGet]
[Route("GetAgreementText/{id}")]
public DefaultApiResult GetAgreementText(long Id)
{
Company com = _companyRepository.Get(Id);
string st = com.AgreementText;
DefaultApiResult result = new DefaultApiResult
{
Data = st
};
return result;
}
Here is my client application Api invoking method
public string GetAgreementTextLoading(long idCompany)
{
string agreementText = "";
// var token = _tokenService.GetLastActivateToken().Hash;
var clientURL = "https://localhost:44305/";
var client = new RestClient(clientURL);
var request = new RestRequest("api/Agreement/GetAgreementText/{Id}", Method.GET);
request.AddUrlSegment("Id", idCompany.ToString());
IRestResponse response = client.Execute(request);
AppRestResponse apiResponse = SimpleJson.DeserializeObject<AppRestResponse>(response.Content);
var statusMessage = "";
if (apiResponse.Success)
{
statusMessage = "Success.";
if (!string.IsNullOrEmpty(response.Content))
{
agreementText = apiResponse.Data.ToString();
}
else
{
throw new Exception("Invalid response");
}
}
else
{
agreementText = "Error retrieving agreement text";
}
return agreementText;
}
public class AppRestResponse
{
public bool Success { get; set; }
public object Data { get; set; }
public IEnumerable<AppRestReponseError> ErrorMessages { get; set; }
}
public class DefaultApiResult
{
public bool Success
{
get
{
return ErrorMessages.Count == 0;
}
private set { }
}
public List<ErrorMessage> ErrorMessages { get; set; }
public object Data { get; set; }
public DefaultApiResult()
{
ErrorMessages = new List<ErrorMessage>();
}
public DefaultApiResult(string errorMessage)
:this()
{
ErrorMessages.Add(new ErrorMessage()
{
Message = errorMessage
});
}
public DefaultApiResult(string[] errorMessages)
:this()
{
foreach (var errorMessage in errorMessages)
{
ErrorMessages.Add(new ErrorMessage()
{
Message = errorMessage
});
}
}
}

Answer 1

I'm not sure about the SimpleJson and the rest client you are using .
However , assuming you're using the RestSharp , it seems that there's no need to use the SimpleJson to deserialize response here .
I just remove the following codes :
IRestResponse response = client.Execute(request);
AppRestResponse apiResponse = SimpleJson.DeserializeObject<AppRestResponse>(response.Content);
and add the following two lines:
IRestResponse<AppRestResponse> response = client.Execute<AppRestResponse>(request);
var apiResponse= response.Data;
It works as expected .