How to read/parse Content from OkNegotiatedContentResult?

问题

In one of my API actions (PostOrder) I may be consuming another action in the API (CancelOrder). Both return a JSON formatted ResultOrderDTO type, set as a ResponseTypeAttribute for both actions, which looks like this:

public class ResultOrderDTO
{
    public int Id { get; set; }
    public OrderStatus StatusCode { get; set; }
    public string Status { get; set; }
    public string Description { get; set; }
    public string PaymentCode { get; set; }
    public List<string> Issues { get; set; }
}

What I need is reading/parsing the ResultOrderDTO response from CancelOrder, so that I can use it as response for PostOrder. This is what my PostOrder code looks like:

// Here I call CancelOrder, another action in the same controller
var cancelResponse = CancelOrder(id, new CancelOrderDTO { Reason = CancelReason.Unpaid });

if (cancelResponse is OkNegotiatedContentResult<ResultOrderDTO>)
{
    // Here I need to read the contents of the ResultOrderDTO
}
else if (cancelResponse is InternalServerErrorResult)
{
    return ResponseMessage(Request.CreateResponse(HttpStatusCode.InternalServerError, new ResultError(ErrorCode.InternalServer)));
}

When I use the debugger, I can see that the ResultOrderDTO it is there somewhere in the response (looks like the Content) as shown in the pic below:

but cancelResponse.Content does not exist (or at least I don't have access to it before I cast my response to something else) and I have no idea about how to read/parse this Content. Any idea?

回答1:

Simply cast the response object to OkNegotiatedContentResult<T>. The Content property is object of type T. which in your case is object of ResultOrderDTO.

if (cancelResponse is OkNegotiatedContentResult<ResultOrderDTO>)
{
    // Here's how you can do it. 
    var result = cancelResponse as OkNegotiatedContentResult<ResultOrderDTO>;
    var content = result.Content;
}

来源：https://stackoverflow.com/questions/35322846/how-to-read-parse-content-from-oknegotiatedcontentresult