Passing and returning two different generic classes in method

Question

Right now I am using T for Generic1, but understandably getting an error when I pass in the sPayload because I'm unsure how to specify a second generic type.

public static Generic1 SendReceive<Generic1>(string sUrl, Generic2 sPayload)
{
    using(WebClient webclient = new WebClient())
    {
        webclient.Headers[HttpRequestHeader.ContentType] = "application/json";
        string response = webclient.UploadString(sUrl, JsonConvert.SerializeObject(sPayload));
        Generic1 parsedResponse = JsonConvert.DeserializeObject<Generic1>(response);
        return parsedResponse;
    }
}

I'd like to avoid using conditional statements and hardcoding the potential types being passed in. I'm just unsure how to go about doing this.

Answer 1

You need to specify both types in the declaration:

public static TResult SendReceive<TResult, TPayLoad>(string sUrl, TPayLoad sPayload)
{
    using(WebClient webclient = new WebClient())
    {
        webclient.Headers[HttpRequestHeader.ContentType] = "application/json";
        string response = webclient.UploadString(sUrl, JsonConvert.SerializeObject(sPayload));
        TResult parsedResponse = JsonConvert.DeserializeObject<TResult>(response);
        return parsedResponse;
    }
}

Answer 2

You can specify multiple generic types by separating them with a comma

public static TResponse SendReceive<TRequest,TResponse>(string sUrl, TRequest sPayload)
{
   ....
}

Answer 3

You can add multiple parameters using this this way

public static T1 SendReceive<T1,T2,...Tn>(string sUrl, TRequest sPayload)
{
   //TODO Code
}

and then you can call it like this

className.SendResponse<Class1, Class2,...Classn>(...);