Custom attribute which returns http response

Question

I'm trying to make a custom attribute in my controller methods, i want this attribute to get the HTTPContext and i want to either let it continue to the method if some condition is true or else return a BadRequest with an ErrorModel I created.

this is how my current middleware does it, but I would like something similar as an attribute above my methods (or even the entire controller class).

if (!response.Success) { context.Response.StatusCode = (int)HttpStatusCode.BadRequest; var errorMessageJson = JsonConvert.SerializeObject(new ErrorViewModel() { Identifier = "CPP_ERROR", Id = 1, Name = "INVALID_LOCATION", Description = string.IsNullOrEmpty(computerName) ? "Werkplek is onbekend." : $"Werkplek {computerName} is niet gekoppeld aan een business balie." }); await context.Response.WriteAsync(errorMessageJson); } else { context.SetWorkstation(response.Computer); context.SetLocation(response.Location); // Call the next delegate/ middleware in the pipeline await _next(context); }

Does anyone know how to achieve this? I've already looked into a custom authorization attribute but then i have no control over the HTTPResponse which is returned.

code-maze.com/action-filters-aspnetcore

Chetan
– Chetan

2019-05-16 08:20:34 +00:00
Commented May 16, 2019 at 8:20 — Chetan
– Chetan, Commented May 16, 2019 at 8:20

Henk Mollema · Accepted Answer · 2019-05-16 08:47:45Z

You're looking for an action filter: https://learn.microsoft.com/en-us/aspnet/core/mvc/controllers/filters?view=aspnetcore-2.2. Action filters can be applied to controller actions using attributes. For example:

public class MyActionFilterAttribute : ActionFilterAttribute { public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next) { // Add some condition here if (...) { // Execute the action if the condition is true await next(); } else { // Short-circuit the action by specifying a result context.Result = new BadRequestObjectResult(new ErrorViewModel { // ... }); } } }

You can apply this filter by using the [MyActionFilter] attribute on either a controller or action, or as a global filter. For example:

[MyActionFilter] public class MyController : Controller { }

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