CODEWITHSUNDEEP
c#apiasp.net-core-mvcasp.net-core-2.0
Bagzli
Bagzli

Reputation: 6597

Handling 404 in MVC Core API Project

I'm trying to figure out where I went wrong. I want to catch 404 errors that come to my api. I have the middleware setup, but the exception never occurs when I try to hit the page that doesn't exist.

public async Task Invoke(HttpContext context)
{
    try
    {
        await _requestDelegate.Invoke(context);
    }
    catch (Exception exception)
    {
        await HandleExceptionAsync(context, exception);
    }
}


//in startup
app.UseMiddleware<ExceptionHandler>();

and I register it in the startup, its the first thing I do to ensure it handles the rest.

Upvotes: 1

Views: 954

Answers (1)

jimSampica
jimSampica

Reputation: 12420

Sounds like you want UseStatusCodePagesWithReExecute to catch the 404 and modify the response, log, ect.

//Startup.cs
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    ...
    app.UseStatusCodePagesWithReExecute("/error/", "?statusCode={0}");
    ...
}

//SomeController.cs
public IActionResult Error(int? statusCode = null)
{
    if(statusCode == 404) return new ObjectResult(new { message = "404 - Not Found" });
    ...
}

Upvotes: 2

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