当使用WEB API时，如何从POST的HttpResponseMessage中提取内容

Question

非常典型的CRUD操作将导致对象在持久化后设置其Id。

因此，如果我在控制器上有Post方法，它接受一个对象（比如JSON序列化），并返回一个HttpResponseMessage，其中HttpStatusCode Created和Content设置为同一个对象，Id从null更新为整数，那么我如何使用HttpClient来获取该Id值？

这可能很简单，但我看到的只是System.Net.Http.StreamContent。从post方法返回Int更好吗？

谢谢。

更新（以下答案）：

一个工作示例。。。

namespace TryWebAPI.Models {
    public class YouAreJoking {
        public int? Id { get; set; }
        public string ReallyRequiresFourPointFive { get; set; }
    }
}
namespace TryWebAPI.Controllers {
    public class RyeController : ApiController {
        public HttpResponseMessage Post([FromBody] YouAreJoking value) {
            //Patience simulated
            value.Id = 42;
            return new HttpResponseMessage(HttpStatusCode.Created) {
                Content = new ObjectContent<YouAreJoking>(value,
                            new JsonMediaTypeFormatter(),
                            new MediaTypeWithQualityHeaderValue("application/json"))
            };
        }
    }
}
namespace TryWebApiClient {
    internal class Program {
        private static void Main(string[] args) {
            var result = CreateHumour();
            Console.WriteLine(result.Id);
            Console.ReadLine();
        }
        private static YouAreJoking CreateHumour() {
            var client = new HttpClient();
            var pennyDropsFinally = new YouAreJoking { ReallyRequiresFourPointFive = "yes", Id = null };
            YouAreJoking iGetItNow = null;
            var result = client
                .PostAsJsonAsync("http://localhost:1326/api/rye", pennyDropsFinally)
                .ContinueWith(x => {
                                var response = x.Result;
                                var getResponseTask = response
                                    .Content
                                    .ReadAsAsync<YouAreJoking>()
                                    .ContinueWith<YouAreJoking>(t => {
                                        iGetItNow = t.Result;
                                        return iGetItNow;
                                    }
                );
                Task.WaitAll(getResponseTask);
                return x.Result;
            });
            Task.WaitAll(result);
            return iGetItNow;
        }
    }
}

似乎受到Node.js的启发。

Answer 1

您可以使用ReadAsAsync<T>

.NET4（您也可以在没有延续的情况下完成此操作）

var resultTask = client.PostAsJsonAsync<MyObject>("http://localhost/api/service",new MyObject()).ContinueWith<HttpResponseMessage>(t => {
    var response = t.Result;
    var objectTask = response.Content.ReadAsAsync<MyObject>().ContinueWith<Url>(u => {
        var myobject = u.Result;
        //do stuff 
    });
});

.NET 4.5

    var response = await client.PostAsJsonAsync<MyObject>("http://localhost/api/service", new MyObject());
    var myobject = await response.Content.ReadAsAsync<MyObject>();