是什么型Htt presponseMessage和Htt的presponseException之间的差异 [英] What is the difference between HttpResponseMessage and HttpResponseException

问题描述

我试图理解都写样本code：

I tried to understand both and write sample code:

 public HttpResponseMessage Get()
 {
     var response = ControllerContext.Request
                         .CreateResponse(HttpStatusCode.BadRequest, "abc");

     throw new HttpResponseException(response);
 }

和

 public HttpResponseMessage Get()
 {
     return ControllerContext.Request
                        .CreateResponse(HttpStatusCode.BadRequest, "abc");
 }

从小提琴，我真的没有看到他们之间的任何差别，那么什么是使用的目的的Htt presponseException ？

推荐答案

两者之间的主要区别是这样的。唯一的例外是有用的，立即停止加工和出口。例如，假设我有以下的code

The main difference between the two is this. The exception is useful to immediately stop processing and exit. For example assume I have the following code

public class CustomerController : ApiController {
  private ICustomerContext repo;

  public CustomerController(ICustomerContext repo) {
    this.repo = repo;
  }

  public Customer Get(int id) {
    var customer = repo.Customers.SingleOrDefault(c=>c.CustomerID == id);
    if (customer == null) {
      throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.NotFound));
    }
    return customer;
  }
}

如果这个code运行和我通过一个id不是present，它会立即停止加工，并返回404状态code。

If this code runs and I pass an id that is not present, it will immediately stop processing and return a status code of 404.

如果不是我回到了Htt presponseMessage，请求将很乐意继续处理的其余部分，并返回一个404的主要区别是结束请求或没有。

If instead I return HttpResponseMessage, the request will happily continue the rest of its processing and return a 404. The main difference being end the request or not.

由于达雷尔表示，例外的是在某些情况下，我想处理继续进行（如当客户发现）的情况下，而在其他我不知道。

As Darrel said the exception is useful in cases where in some cases I want processing to continue (as in when customer is found) and in others I don't.

在这里，你可能想使用类似的Htt presponseMessage是在HTTP POST返回201状态code和设置位置标头的地方。在这种情况下，我想处理继续进行。这将会做这个code *

The place where you might want to use something like HttpResponseMessage is in an Http POST to return a status code of 201 and set the location header. In that case I do want processing to continue. That would would do with this code.*

public class CustomerController : ApiController {
  private ICustomerContext repo;

  public CustomerController(ICustomerContext repo) {
    this.repo = repo;
  }

  public HttpResponseMessage Post(Customer customer) {
    repo.Add(customer);
    repo.SaveChanges();
    var response = Request.CreateResponse(HttpStatusCode.Created, customer);
    response.Headers.Location = new Uri(Request.RequestUri, string.format("customer/{0}", customer.id));
    return response;
  }
}

*注：如果您使用的是测试版位，你将创建一个新的Htt presponseMessage。我使用但是后来位需要您使用CreateResponse扩展方法关闭请求。

*note: If you are using the beta bits you would create a new HttpResponseMessage. I am using the later bits however which require you to use the CreateResponse extension method off of the Request.

在上面，我创建这台状态code至201，通过在客户，然后设置位置标头的响应。

Above, I am creating a response which sets the status code to 201, passes in the customer, and then sets the location header.

然后返回响应，并要求继续处理。

The response is then returned and the request continues processing.

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