throw exception from onactionexecuting in base controller

kikme

Member

210 Points

10 Posts

In asp.net core api application, we have base controller from where all application's controllers inherited.
And in base controller overriding onActionExecuting method.
On the basis of few condition, want to throw exception and that can be handle from action or any global middle-ware:

public class BaseController<TService> : Controller
{
    public BaseController(TService service, ILogger logger)
    {
        Service = service;
        Logger = logger;
    }

    public CurrentUser CurrentUser { get; set; }

    protected TService Service { get; }

    protected ILogger Logger { get; }

    public override void OnActionExecuting(ActionExecutingContext context)
    {
        var identityClaims = context.HttpContext.User;

        CurrentUser = new CurrentUser();
        CurrentUser.UserEmail = identityClaims.Claims.SingleOrDefault(c => c.Type == "email")?.Value;
        
        if(String.IsNullOrEmpty(CurrentUser.UserEmail))
        {
            throw new Exception("Unauthorized")
        }
    }
}

But not catching on action Try ... Catch block.

.netcore c#error-handling

Views: 3069
Total Answered: 2
Total Marked As Answer: 1
Posted On: 16-May-2020 06:03

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Answers

nicehai

Member

10 Points

0 Posts

if (env.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
}
else
{
   app.UseExceptionHandler(app =>
   {
        app.Run(async context =>
        {
            context.Response.StatusCode = 500;
            context.Response.ContentType = "text/html";

            await context.Response.WriteAsync("<html lang=\"en\"><body>\r\n");
            await context.Response.WriteAsync("ERROR!<br><br>\r\n");

            var exceptionHandlerPathFeature = 
                context.Features.Get<IExceptionHandlerPathFeature>();

            // Use exceptionHandlerPathFeature to process the exception (for example, 
            // logging), but do NOT expose sensitive error information directly to 
            // the client.

            if (exceptionHandlerPathFeature?.Error is FileNotFoundException)
            {
                await context.Response.WriteAsync("File error thrown!<br><br>\r\n");
            }

            await context.Response.WriteAsync("<a href=\"/\">Home</a><br>\r\n");
            await context.Response.WriteAsync("</body></html>\r\n");
            await context.Response.WriteAsync(new string(' ', 512)); // IE padding
        });
    });
    app.UseHsts();
}

We can sue middle-ware in startup.cs as:

Posted On: 26-May-2020 00:56

Smith

None

2568 Points

74 Posts

app.UseExceptionHandler(a => a.Run(async context =>
            {
                var exceptionHandlerPathFeature = context.Features.Get<IExceptionHandlerPathFeature>();
                var exception = exceptionHandlerPathFeature.Error;
                var result = JsonConvert.SerializeObject(new ResponseModel
                {
                    Code = exception.HResult,
                    Message = exception.Message
                });
                context.Response.ContentType = "application/json";
                context.Response.StatusCode = 400;
                await context.Response.WriteAsync(result);
            }));

public class ResponseModel
    {
        public string Message { get; set; }
        public int Code { get; set; }
    }

Posted On: 28-May-2020 23:50

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throw exception from onactionexecuting in base controller

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