Testing Action Filters for converting IDomainResult to IActionResult

samples/WebApi/Controllers/GlobalFilterResponsesController.cs

@@ -0,0 +1,29 @@
+using System.Threading.Tasks;
+
+using DomainResults.Common;
+using DomainResults.Examples.Domain;
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace DomainResults.Examples.WebApi.Controllers;
+
+[ApiController]
+[Route("[controller]")]
+public class GlobalFilterResponsesController : ControllerBase
+{
+	private readonly DomainSuccessService _service = new();
+
+	[HttpGet("[action]")]
+	public IDomainResult<int> Get200OkWithNumber() 
+		=> _service.GetSuccessWithNumericValue();
+
+	[HttpGet("[action]")]
+	public Task<IDomainResult<int>> Get200OkWithNumberTask() 
+		=> _service.GetSuccessWithNumericValueTask();
+
+	[HttpGet("[action]")]
+	[ProducesResponseType(StatusCodes.Status204NoContent)]
+	public Task<IDomainResult> Get204NoContentTask()
+		=> _service.GetSuccessTask();
+}

samples/WebApi/Startup.cs

@@ -1,7 +1,9 @@
 using DomainResults.Examples.WebApi.Configuration;
+using DomainResults.Mvc.IResult;
 
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
@@ -19,7 +21,8 @@ public Startup(IConfiguration configuration)
 	// This method gets called by the runtime. Use this method to add services to the container.
 	public void ConfigureServices(IServiceCollection services)
 	{
-		services.AddControllers();
+		services.AddSingleton<IActionFilter, ResultFilter>();
+		services.AddControllers(options => options.Filters.AddService<IActionFilter>());
 		services.AddAndConfigureSwagger();
 	}
 

src/Mvc/IResult/ResultFilter.cs

@@ -0,0 +1,37 @@
+using System.Threading.Tasks;
+
+using DomainResults.Common;
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Filters;
+
+namespace DomainResults.Mvc.IResult;
+
+public class ResultFilter : IActionFilter, IEndpointFilter
+{
+	/// <summary>
+	/// Called before the action executes, after model binding is complete.
+	/// </summary>
+	/// <param name="context">The <see cref="T:Microsoft.AspNetCore.Mvc.Filters.ActionExecutingContext" />.</param>
+	public void OnActionExecuting(ActionExecutingContext context) {}
+
+	/// <summary>
+	/// Called after the action executes, before the action result.
+	/// </summary>
+	/// <param name="context">The <see cref="T:Microsoft.AspNetCore.Mvc.Filters.ActionExecutedContext" />.</param>
+	public void OnActionExecuted(ActionExecutedContext context)
+	{
+		var actionResult = (context.Result as ObjectResult)?.Value;
+		if (actionResult is IDomainResult result)
+			context.Result = result.ToActionResult();
+	//	else (actionResult is IDomainResult<> resultGeneric)
+	//	context.Result = resultGeneric.ToActionResult();
+	}
+
+	public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+	{
+		// See context here
+		return await next(context);
+	}
+}