c# - 客户端没有收到来自 ApiController 的自定义 HttpResponseException

Question

我已经为我的 Web API Controller 操作创建了一个异常过滤器，但它似乎没有做任何事情(即使它确实被调用)。

属性

public class ExceptionHandlerAttribute : ExceptionFilterAttribute
{
    public override void OnException(HttpActionExecutedContext context)
    {
        context.Response = new HttpResponseMessage(HttpStatusCode.BadRequest);
        context.Response.Content = new StringContent("My content");
        context.Response.ReasonPhrase = "My reason";
    }
}

我也试过:

public override void OnException(HttpActionExecutedContext context)
{
    throw new HttpResponseException(
        new HttpResponseMessage(HttpStatusCode.BadRequest)
        {
            Content = new StringContent("The content"),
            ReasonPhrase = "The reason"
        });
}

Controller

[ExceptionHandler]
public class MyController : ApiController
{
    [Route("MyRoute"), HttpGet]
    public MyModel Index() {
        // code causing exception
    }
}

WebApiConfig

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.Filters.Add(new ExceptionHandlerAttribute());
    }
}

但是，当发生异常时，客户端会收到:

Answer 1

您需要使用异常过滤器的响应抛出一个 HttpResponseException:

public override void OnException(HttpActionExecutedContext context)
{
    throw new HttpResponseException(
        new HttpResponseMessage(HttpStatusCode.BadRequest)
        {
            Content = new StringContent("The content"),
            ReasonPhrase = "The reason"
        });
}

这里有关于 how to handle exceptions in Web API 的更多详细信息.