一个非常典型的CRUD操作将导致一个对象的Id设置一旦持久化。
所以，如果我在接受一个对象的控制器上有Post方法(JSON序列化，比方说)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获取在那个Id值？
它可能很简单，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(以下回答)：
一个工作的例子……
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Node.js受到启发。
解决方法
您可以使用ReadAsAsync< T>
.NET 4(你可以在没有延续的情况下做到这一点)
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>();
