对 302 状态代码使用 handleexeption 注释时如何指定位置

How do you specify the location when using handleexeption annotation for a 302 status code

使用 c# Web Api 2,我有抛出 InvalidOperationException 的代码。返回状态代码 302 时,如何使用 HandleException 注释为重定向提供位置?

[HandleException(typeof(InvalidOperationException), HttpStatusCode.Found, ResponseContent = "Custom message 12")]
public IHttpActionResult GetHandleException(int num)
{
     switch (num)
     {
          case 12: throw new InvalidOperationException("DONT SHOW invalid operation exception");

          default: throw new Exception("base exception");
     }
}

编辑: 对不起,我问这个问题有点仓促。上面的class使用了一个继承自ExceptionFilterAttribute的HandleExceptionAttributeclass。我在尝试调试他们的单元测试时没有意识到这一点。该问题不会出现在单元测试中,但会使用需要重定向 url 的 Visual Studio.webtest 出现。从 ExceptionFilterAttribute 继承的 class 没有提供允许提供重定向的 URL 的参数。很抱歉问题不完整,感谢您花时间回答。

/// <summary>
   /// This attribute will handle exceptions thrown by an action method in a consistent way
   /// by mapping an exception type to the desired HTTP status code in the response.
   /// It may be applied multiple times to the same method.
   /// </summary>
   [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = true)]
   public sealed class HandleExceptionAttribute : ExceptionFilterAttribute
   {

已编辑:感谢您更新问题。虽然我仍然不确定为什么要在此 WebApi 方法中重定向。希望这个答案能有所帮助。

我会处理 HandleExceptionAttribute 中的所有异常逻辑。您甚至可以使用您正在寻找的 302 代码从那里重定向。您的 HandleExceptionAttribute 看起来像这样(我包含了 3 种不同的基于异常返回结果的方法):

public sealed class HandleExceptionAttribute : ExceptionFilterAttribute
{
    public override void OnException(HttpActionExecutedContext context)
    {
        //TODO: we can handle all types of exceptions here. Out of memory, divide by zero, etc etc.
        if (context.Exception is InvalidOperationException)
        {
            var httpResponseMessage = context.Request.CreateResponse(HttpStatusCode.Redirect);
            httpResponseMessage.Headers.Location = new Uri("http://www.YourRedirectUrl");
            throw new HttpResponseException(httpResponseMessage);
        }
        if (context.Exception is UnauthorizedAccessException)
        {
            context.Response = context.Request.CreateErrorResponse(HttpStatusCode.Unauthorized, context.Exception.Message);
            return;
        }
        if (context.Exception is TimeoutException)
        {
            throw new HttpResponseException(context.Request.CreateResponse(HttpStatusCode.RequestTimeout, context.Exception.Message));
        }

        context.Response = context.Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "Unable to process your request.");
    }
}

但是,如果您真的希望它按您要求的方式完成,您可以向 GetHandleException 方法添加第二个参数。这将接收消息字符串(或 URL),然后在 HandleExceptionAttribute 中将重定向 url 添加到参数(ActionArguements):

public IHttpActionResult GetHandleException(int num, string message = "")
{
    switch (num)
    {
        case 12: return Redirect(message); //message string would be your url

        default: throw new Exception("base exception");
    }
}

然后你的 HandleExceptionAttribute 看起来像这样:

public sealed class HandleExceptionAttribute : ExceptionFilterAttribute
{
    public override void OnException(HttpActionExecutedContext context)
    {
        context.ActionContext.ActionArguments["message"] = "your redirect URL";

    }
}

根据以下内容即兴创作

 public class HandleExceptionAttribute : ExceptionFilterAttribute
{
    public Type ExceptionType { get; set; }

    public HandleExceptionAttribute(Type exceptionType)
    {
        ExceptionType = exceptionType;
    }
    public override void OnException(HttpActionExecutedContext actionExecutedContext)
    {
        if (actionExecutedContext.Exception.GetType()==ExceptionType)
        {
            var response = actionExecutedContext.Request.CreateResponse(HttpStatusCode.Moved);
            response.Headers.Location=new Uri("http://google.co.uk");
            response.Content=new StringContent("Message");
            actionExecutedContext.Response = response;
        }
        base.OnException(actionExecutedContext);
    }
}

用法

[HandleException(typeof(ExceptionOfTypeA))]
    public HttpResponseMessage Get(int id)
    {
        throw new ExceptionOfTypeA();
    }

尽管我看不出在重定向到可视页面时在其中包含内容有什么意义。但我们开始了