c# – 如何为302状态代码使用handleexeption批注时指定位置

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批注为重定向提供位置？

[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,我有点急忙问这个问题.上面的类使用HandleExceptionAttribute类,该类继承自ExceptionFilterattribute.当我试图调试他们的单元测试时,我没有意识到这一点.单元测试中不会出现此问题,但使用需要重定向URL的Visual Studio .webtest会出现此问题.从ExceptionFilterattribute继承的类未提供允许提供重定向URL的参数.对不起,问题不完整,谢谢你花时间回答.

/// <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
   {

解决方法

编辑：感谢您更新了问题.虽然我仍然不确定你为什么要在这个WebApi方法中重定向.希望这个答案可以提供帮助.

我将处理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.你的HandleExceptionAttribute看起来像这样(我已经包含了3种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,如果您真的想按照您的要求完成它,可以在GetHandleException方法中添加第二个参数.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";

    }
}