无法将类型接口隐式转换为&#39;System.Collections.Generic.IList <T> &#39;

Question

stuck in below issue please help, I have one below class and it contain one method with return type is interface

public class Helper
{ 
    public IRestResponse GetCam (string searchTerm, int page, int pageSize)
    {
       RestRequest request = new RestRequest(Method.GET)
                             {
                               RequestFormat = DataFormat.Json,
                               Resource = string.Format("/assets/campaigns?search={0}&page={1}&count={2}&depth=complete",
                               searchTerm, page, pageSize)
                              };

      IRestResponse response = _client.Execute(request);

      return response;
    }
}

in that interface I have some get set,

public interface IRestResponse
    {
        string Content { get; set; }
        string ContentEncoding { get; set; }
        long ContentLength { get; set; }
        string ContentType { get; set; }
        IList<RestResponseCookie> Cookies { get; }
        Exception ErrorException { get; set; }
        string ErrorMessage { get; set; }
        IList<Parameter> Headers { get; }
        IRestRequest Request { get; set; }
        ResponseStatus ResponseStatus { get; set; }
        Uri ResponseUri { get; set; }

    }
}

Now when I call Helper class in my another program like below it giving me error as :

"Cannot implicitly convert type 'RestSharp.IRestResponse' to 'System.Collections.Generic.IList>'. An explicit conversion exists (are you missing a cast?)"

my calling program have below code

CamSample.Helper f = new CampaignHelper("Company name", "UserName", "Password", "SiteName");
IList<CampaignSample.Models.IRestResponse> q = new List<CampaignSample.Models.IRestResponse>();
//List<IRestResponse<CampaignSample.Models.Campaign>> w = new IList<IRestResponse<CampaignSample.Models.Campaign>>().ToList();
q = f.GetCam("", 1, 200);

--- getting the error here Please tell me the solution

Answer 1

Your method is returning IResponse object not List<IResponse> object, you shoud be writing like this when calling:

CampaignSample.Models.IRestResponse response = f.GetCam("", 1, 200);

or you can make use of var here:

var response = f.GetCam("", 1, 200);