feat: Add filter to validate model state

Author: drwatson1

ProjectTemplates/AspNetCore.WebApi/ReferenceProject/ReferenceProject/Filters/ValidateModelFilter.cs

@@ -0,0 +1,21 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Filters;
+
+namespace ReferenceProject.Filters
+{
+    public class ValidateModelFilter: IActionFilter
+    {
+        public void OnActionExecuted(ActionExecutedContext context)
+        {
+
+        }
+
+        public void OnActionExecuting(ActionExecutingContext context)
+        {
+            if (!context.ModelState.IsValid)
+            {
+                context.Result = new BadRequestObjectResult(context.ModelState);
+            }
+        }
+    }
+}

ProjectTemplates/AspNetCore.WebApi/ReferenceProject/ReferenceProject/Startup.cs

@@ -13,6 +13,7 @@
 using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
+using ReferenceProject.Filters;
 using ReferenceProject.Middleware;
 using ReferenceProject.Modules;
 
@@ -62,7 +63,10 @@ public void ConfigureServices(IServiceCollection services)
                 .AddScoped<IUrlHelper>(x => x
                     .GetRequiredService<IUrlHelperFactory>()
                     .GetUrlHelper(x.GetRequiredService<IActionContextAccessor>().ActionContext))
-                .AddMvc()
+                .AddMvc(options =>
+                {
+                    options.Filters.Add(new ValidateModelFilter());
+                })
                 .AddJsonOptions(options =>
                 {
                     options.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;