我们正在构建一个使用Owin托管的WebApi。以前,我们在控制器操作中使用HttpResponseException来返回404状态码等,并且一直运行良好。
然而,当我们开始使用Owin(自托管)时,我们遇到了这个问题,即HttpResponseException被序列化为json/xml,状态码从404变为500(内部服务器错误)。以下是我们的代码:
然而,当我们开始使用Owin(自托管)时,我们遇到了这个问题,即HttpResponseException被序列化为json/xml,状态码从404变为500(内部服务器错误)。以下是我们的代码:
public class InvoicesController : ApiController
{
private readonly IInvoiceRepository _invoiceRepository;
public InvoicesController(IInvoiceRepository invoiceRepository)
{
_invoiceRepository = invoiceRepository;
}
[HttpGet]
public IEnumerable<AccountCodeAssignment> AssignAccountCodesToInvoiceById(int id)
{
var invoice = _invoiceRepository.Get(id);
if (invoice == null) throw new HttpResponseException(Request.CreateErrorResponse(HttpStatusCode.NotFound, "Invoice not found"));
yield return new AccountCodeAssignment(1, ...);
yield return new AccountCodeAssignment(2, ...);
yield return new AccountCodeAssignment(3, ...);
yield return new AccountCodeAssignment(4, ...);
}
}
我们收到的响应是一个500错误代码:
{
"Message": "An error has occurred.",
"ExceptionMessage": "Processing of the HTTP request resulted in an exception. Please see the HTTP response returned by the 'Response' property of this exception for details.",
"ExceptionType": "System.Web.Http.HttpResponseException",
"StackTrace": " at AccountCodeAssignmentService.Controllers.InvoicesController.<AssignAccountCodesToInvoiceById>d__0.MoveNext() in c:\\Projects\\AccountCodeAssignmentService\\Source\\AccountCodeAssignmentService\\Controllers\\InvoicesController.cs:line 38\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)\r\n at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)\r\n at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)\r\n at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, Encoding effectiveEncoding)\r\n at System.Net.Http.Formatting.JsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, Encoding effectiveEncoding)\r\n at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content)\r\n at System.Net.Http.Formatting.BaseJsonMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Owin.HttpMessageHandlerAdapter.<BufferResponseContentAsync>d__13.MoveNext()"
}
我们到底做错了什么或者说在使用Owin自托管时HttpResponseException不支持吗?
编辑: 对我们来说,使用WebApi的一个巨大优势是可以处理和返回我们自己的类型,所以我们希望避免改变返回类型。目前我们正在生成AccountCodeAssignment,因此更改返回类型不是一个选项。