Catch all exception in ASP.NET MVC + Web Api [duplicate]

Question

I know there are plenty of threads about this topic but none provides an entire and full working solution.

Scenario

I have an application which is providing both, MVC 5 and Web Api 2.2 controllers. I have the need of catching all exceptions (including 404, 401) and return always a custom JSON error structure.

Partial Solution

So far I have implemented, a custom ExceptionFilterAttribute as following:

public class ExceptionFilter : ExceptionFilterAttribute
{
    public override void OnException(HttpActionExecutedContext context)
    {
        context.Response = context.Request.CreateResponse(
            HttpStatusCode.InternalServerError,
            new
            {
                Title = "An Error occured while processing the request",
                Message = context.Exception.ToString(),
                Type = "Error",
                Code = context.Exception.HResult
            });
        context.Response.ReasonPhrase = "An Error occurred while processing the request";
    }
}

Then I also extended and replaced the available ExceptionHandler service as following:

public class GenericExceptionHandler : ExceptionHandler
{
    public override void Handle(ExceptionHandlerContext context)
    {
        context.Result = HttpResponseFactory.BadResponse(
            context.Request,
            "An unhandled error occurred",
            context.Exception.Message,
            10000);
    }   
}

And I swap both during my initialization:

public static void Register(HttpConfiguration config)
{
    // authentication
    config.Filters.Add(new AuthorizeAttribute());
    // error handler
    config.Filters.Add(new ExceptionFilter());
    // error service
    config.Services.Replace(typeof(IExceptionHandler), new GenericExceptionHandler());
}

Unfortunately when I generate:

401 - Not Authorized
404 - Not Found
certain 500 - Internal Server Error

I cannot catch the exception. Is there any way to achieve it?

@PatrickHofman I just send an non-authenticated request, I get back 401 but I can't intercept the response generated by ASP.NET stack — Raffaeu
– Raffaeu, Commented Jan 17, 2017 at 13:10
I am not debating. I am trying to get enough information to write up an answer, if that is what you'd like me to do... :) — Patrick Hofman
– Patrick Hofman, Commented Jan 18, 2017 at 9:38
How is this a duplicate of that question when the OP is not even using global.asax? — CodingYoshi
– CodingYoshi, Commented Jan 19, 2017 at 3:48

CodingYoshi · Accepted Answer · 2017-01-17 13:18:23Z

2

Put this in your Global file:

protected void Application_Error(object sender, EventArgs e)
{
    Exception exception = Server.GetLastError();

    // Do something with the error.
    System.Diagnostics.Debug.WriteLine(exception);

    // Redirect somewhere or return an error code in case of web api
    Response.Redirect("/Home/Error");
}

Anytime, an error occurs, ASP MVC will call that method.

edited Jan 17, 2017 at 13:18

answered Jan 17, 2017 at 13:09

CodingYoshi

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3 Comments

Raffaeu Over a year ago

I am using OWIN, I don't have Global.asax

CodingYoshi Over a year ago

So add one. I do not think using OWIN means no Global.asax file.

Bassie Over a year ago

For some reason this only catches some errors... e.g. if I navigate to a non-existent page, then Application_Error fires, but if an exception is thrown from the code then it doesn't..

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