ASP.NET on InternetException

Difference between Controller and ControllerBase

Tue, 25 Oct 2022 16:28:23 +0200

Controller type inherits from ControllerBase and have Views support
ControllerBase type is better suited for APIs

Further read:

https://learn.microsoft.com/en-us/aspnet/core/web-api/?view=aspnetcore-6.0

Kestrel

Tue, 25 Oct 2022 15:56:40 +0200

default application server for .net
cross platform
best performance and memory utilization
may not have some advanced features of HTTP.sys on Windows
may be used with proxy server or as internet facing server

Further read:

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/servers/kestrel?view=aspnetcore-6.0

ASP.NET Core controller level exception handling

Tue, 25 Oct 2022 15:53:52 +0200

To handle exceptions on Controller/Action level Exception Filters are used.

[TypeFilter(typeof(SampleExceptionFilter))]
public class ExceptionController : Controller

Exception Filters are implemented using IExceptionFilter with OnExcetion method override to handle exceptions.

Exception Filters can be applied to Controller and Action level.

Further read:

https://learn.microsoft.com/en-us/aspnet/core/mvc/controllers/filters?view=aspnetcore-7.0#exception-filters

https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.filters.iexceptionfilter?view=aspnetcore-7.0

ASP.NET Core global exception handling

Tue, 25 Oct 2022 15:49:53 +0200

To add global exception handling in ASP.NET Core just use configuration method:

app.UseExceptionHandler

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/error-handling?view=aspnetcore-6.0#exception-handler-lambda

What ASP.NET Middleware can do?

Tue, 25 Oct 2022 15:45:12 +0200

Pretty much everything. Default ASP.NET Core request handling pipeline is consisting of bunch of middlewares:

Whole list of built-in middlewares can be found here:

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/middleware/?view=aspnetcore-7.0#built-in-middleware

There is possibility to write custom middleware too.

Middleware in OWIN

Tue, 25 Oct 2022 15:40:45 +0200

There are 2 ways of writing OWIN middleware in ASP.NET Core.

Pure OWIN - usefull if you want to integrate with OWIN compatible module but not written in C#
ASP.NET Core OWIN middleware

ASP.NET Core Middleware:

This type of middleware can be:

delegate of Func<HttpContext, Func<Task>, Task>
class with IMiddleware imlementation

app.Use(async (context, next) =>
{
 // Do work that can write to the Response.
 await next.Invoke();
 // Do logging or other work that doesn't write to the Response.
});

Pure OWIN Middleware:

This rather would be used to integrate with OWIN middlewares written in different language, so that ASP.NET Core implementation directly is not possible.