抛出 HttpResponseException 或返回 Request？
在回顾了一篇文章 ASP.NET Web API 中的异常处理之后，我对何时抛出异常与何时返回错误响应感到有些困惑。我还想知道是否有可能修改响应时，您的方法返回一个领域特定的模型，而不是 HttpResponseMessage..。
所以，这里回顾一下我的问题，后面跟着一些带有 case # s 的代码:
问题
有关个案1的问题
- 我是否应该总是使用
HttpResponseMessage而不是具体的域模型，以便消息可以自定义？ - 如果返回具体的域模型，是否可以自定义消息？
关于案例2,3,4的问题
- 我应该抛出异常还是返回错误响应？如果答案是“视情况而定”，你可以举例说明什么时候使用一种方法对另一种方法。
- 抛出
HttpResponseException和抛出Request.CreateErrorResponse的区别是什么? 输出到客户端似乎相同..。 - 我是否应该总是使用
HttpError在错误中“包装”响应消息(无论是抛出异常还是返回错误响应) ？
案例样本
// CASE #1
public Customer Get(string id)
{
var customer = _customerService.GetById(id);
if (customer == null)
{
var notFoundResponse = new HttpResponseMessage(HttpStatusCode.NotFound);
throw new HttpResponseException(notFoundResponse);
}
//var response = Request.CreateResponse(HttpStatusCode.OK, customer);
//response.Content.Headers.Expires = new DateTimeOffset(DateTime.Now.AddSeconds(300));
return customer;
}
// CASE #2
public HttpResponseMessage Get(string id)
{
var customer = _customerService.GetById(id);
if (customer == null)
{
var notFoundResponse = new HttpResponseMessage(HttpStatusCode.NotFound);
throw new HttpResponseException(notFoundResponse);
}
var response = Request.CreateResponse(HttpStatusCode.OK, customer);
response.Content.Headers.Expires = new DateTimeOffset(DateTime.Now.AddSeconds(300));
return response;
}
// CASE #3
public HttpResponseMessage Get(string id)
{
var customer = _customerService.GetById(id);
if (customer == null)
{
var message = String.Format("customer with id: {0} was not found", id);
var errorResponse = Request.CreateErrorResponse(HttpStatusCode.NotFound, message);
throw new HttpResponseException(errorResponse);
}
var response = Request.CreateResponse(HttpStatusCode.OK, customer);
response.Content.Headers.Expires = new DateTimeOffset(DateTime.Now.AddSeconds(300));
return response;
}
// CASE #4
public HttpResponseMessage Get(string id)
{
var customer = _customerService.GetById(id);
if (customer == null)
{
var message = String.Format("customer with id: {0} was not found", id);
var httpError = new HttpError(message);
return Request.CreateErrorResponse(HttpStatusCode.NotFound, httpError);
}
var response = Request.CreateResponse(HttpStatusCode.OK, customer);
response.Content.Headers.Expires = new DateTimeOffset(DateTime.Now.AddSeconds(300));
return response;
}
更新
为了帮助进一步演示案例 # 2、3、4，下面的代码片段突出显示了在找不到客户时“可能发生”的几个选项..。
if (customer == null)
{
// which of these 4 options is the best strategy for Web API?
// option 1 (throw)
var notFoundMessage = new HttpResponseMessage(HttpStatusCode.NotFound);
throw new HttpResponseException(notFoundMessage);
// option 2 (throw w/ HttpError)
var message = String.Format("Customer with id: {0} was not found", id);
var httpError = new HttpError(message);
var errorResponse = Request.CreateErrorResponse(HttpStatusCode.NotFound, httpError);
throw new HttpResponseException(errorResponse);
// option 3 (return)
var message = String.Format("Customer with id: {0} was not found", id);
return Request.CreateErrorResponse(HttpStatusCode.NotFound, message);
// option 4 (return w/ HttpError)
var message = String.Format("Customer with id: {0} was not found", id);
var httpError = new HttpError(message);
return Request.CreateErrorResponse(HttpStatusCode.NotFound, httpError);
}
最佳答案