Address Copilot review: extract GetEffectiveMethodInfo helper and fix method resolution in ValidateActionArgumentsAsync

Extract override method resolution logic into a reusable GetEffectiveMethodInfo helper to avoid duplication.
Use the resolved override method in ValidateActionArgumentsAsync so that IMethodInvocationValidator validates
against the concrete method on the controller type, not the base method from ActionDescriptor.
Remove unused imports in FluentValidationTestAppService_Tests.

framework/src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/Validation/AbpValidationActionFilter.cs

@@ -1,4 +1,5 @@
 using System.Linq;
+using System.Reflection;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc.Abstractions;
 using Microsoft.AspNetCore.Mvc.Filters;
@@ -39,23 +40,13 @@ public class AbpValidationActionFilter : IAsyncActionFilter, IAbpFilter, ITransi
             return;
         }
 
-        if (context.ActionDescriptor.GetMethodInfo().DeclaringType != context.Controller.GetType())
+        var effectiveMethod = GetEffectiveMethodInfo(context);
+        if (effectiveMethod != null)
         {
-            var baseMethod = context.ActionDescriptor.GetMethodInfo();
-
-            var overrideMethod = context.Controller.GetType().GetMethods().FirstOrDefault(x =>
-                x.DeclaringType == context.Controller.GetType() &&
-                x.Name == baseMethod.Name &&
-                x.ReturnType == baseMethod.ReturnType &&
-                x.GetParameters().Select(p => p.ToString()).SequenceEqual(baseMethod.GetParameters().Select(p => p.ToString())));
-
-            if (overrideMethod != null)
+            if (ReflectionHelper.GetSingleAttributeOfMemberOrDeclaringTypeOrDefault<DisableValidationAttribute>(effectiveMethod) != null)
             {
-                if (ReflectionHelper.GetSingleAttributeOfMemberOrDeclaringTypeOrDefault<DisableValidationAttribute>(overrideMethod) != null)
-                {
-                    await next();
-                    return;
-                }
+                await next();
+                return;
             }
         }
 
@@ -69,9 +60,26 @@ public class AbpValidationActionFilter : IAsyncActionFilter, IAbpFilter, ITransi
         await next();
     }
 
+    protected virtual MethodInfo? GetEffectiveMethodInfo(ActionExecutingContext context)
+    {
+        var baseMethod = context.ActionDescriptor.GetMethodInfo();
+        if (baseMethod.DeclaringType == context.Controller.GetType())
+        {
+            return null;
+        }
+
+        return context.Controller.GetType().GetMethods().FirstOrDefault(x =>
+            x.DeclaringType == context.Controller.GetType() &&
+            x.Name == baseMethod.Name &&
+            x.ReturnType == baseMethod.ReturnType &&
+            x.GetParameters().Select(p => p.ToString()).SequenceEqual(baseMethod.GetParameters().Select(p => p.ToString())));
+    }
+
     protected virtual async Task ValidateActionArgumentsAsync(ActionExecutingContext context)
     {
-        var methodInfo = context.ActionDescriptor.GetMethodInfo();
+        var baseMethod = context.ActionDescriptor.GetMethodInfo();
+        var methodInfo = GetEffectiveMethodInfo(context) ?? baseMethod;
+
         var parameterValues = methodInfo.GetParameters()
             .Select(p => context.ActionArguments.TryGetValue(p.Name!, out var value) ? value : null)
             .ToArray();

framework/test/Volo.Abp.AspNetCore.Mvc.Tests/Volo/Abp/AspNetCore/Mvc/Validation/FluentValidationTestAppService_Tests.cs

@@ -1,10 +1,8 @@
-using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Text;
 using System.Threading.Tasks;
 using Shouldly;
-using Volo.Abp.Http;
 using Xunit;
 
 namespace Volo.Abp.AspNetCore.Mvc.Validation;