Exempt parameters resolved from DI from validation

src/Http/Http.Extensions/gen/Microsoft.AspNetCore.Http.ValidationsGenerator/Parsers/ValidationsGenerator.TypesParser.cs

@@ -25,10 +25,22 @@ internal ImmutableArray<ValidatableType> ExtractValidatableTypes(IInvocationOper
         var parameters = operation.TryGetRouteHandlerMethod(operation.SemanticModel, out var method)
             ? method.Parameters
             : [];
+
+        var fromServiceMetadataSymbol = wellKnownTypes.Get(
+            WellKnownTypeData.WellKnownType.Microsoft_AspNetCore_Http_Metadata_IFromServiceMetadata);
+
         var validatableTypes = new HashSet<ValidatableType>(ValidatableTypeComparer.Instance);
         List<ITypeSymbol> visitedTypes = [];
+
         foreach (var parameter in parameters)
         {
+            // Skip attributes that implement the IFromServiceMetadata interface.
+            // These attributes are used for dependency injection (DI) purposes and do not require validation.
+            if (parameter.GetAttributes().Any(attr => attr.AttributeClass is not null && attr.AttributeClass.ImplementsInterface(fromServiceMetadataSymbol)))
+            {
+                continue;
+            }
+
             _ = TryExtractValidatableType(parameter.Type, wellKnownTypes, ref validatableTypes, ref visitedTypes);
         }
         return [.. validatableTypes];

src/Http/Http.Extensions/test/ValidationsGenerator/ValidationsGenerator.IValidatableObject.cs

@@ -15,6 +15,7 @@ public async Task CanValidateIValidatableObject()
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Validation;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
 
@@ -24,7 +25,11 @@ public async Task CanValidateIValidatableObject()
 
 var app = builder.Build();
 
-app.MapPost("/validatable-object", (ComplexValidatableType model) => Results.Ok());
+app.MapPost("/validatable-object", (
+    ComplexValidatableType model,
+    // Demonstrates that parameters that are annotated with [FromService] are not processed
+    // by the source generator and not emitted as ValidatableTypes in the generated code.
+    [FromServices] IRangeService rangeService) => Results.Ok(rangeService.GetMinimum()));
 
 app.Run();
 

src/Http/Http.Extensions/test/ValidationsGenerator/ValidationsGenerator.Parameters.cs

@@ -16,28 +16,40 @@ public async Task CanValidateParameters()
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Validation;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
 
 var builder = WebApplication.CreateBuilder();
 
 builder.Services.AddValidation();
+builder.Services.AddSingleton<TestService>();
 
 var app = builder.Build();
 
 app.MapGet("/params", (
+    // Skipped from validation because it is resolved as a service by IServiceProviderIsService
+    TestService testService,
     [Range(10, 100)] int value1,
     [Range(10, 100), Display(Name = "Valid identifier")] int value2,
     [Required] string value3 = "some-value",
     [CustomValidation(ErrorMessage = "Value must be an even number")] int value4 = 4,
-    [CustomValidation, Range(10, 100)] int value5 = 10) => "OK");
+    [CustomValidation, Range(10, 100)] int value5 = 10,
+    // Skipped from validation because it is marked as a [FromService] parameter
+    [FromServices] [Range(10, 100)] int? value6 = 4) => "OK");
 
 app.Run();
 
 public class CustomValidationAttribute : ValidationAttribute
 {
     public override bool IsValid(object? value) => value is int number && number % 2 == 0;
 }
+
+public class TestService
+{
+    [Range(10, 100)]
+    public int Value { get; set; } = 4;
+}
 """;
         await Verify(source, out var compilation);
         await VerifyEndpoint(compilation, "/params", async (endpoint, serviceProvider) =>

src/Http/Http.Extensions/test/ValidationsGenerator/snapshots/ValidationsGeneratorTests.CanValidateParameters#ValidatableInfoResolver.g.verified.cs

@@ -60,6 +60,11 @@ public GeneratedValidatableTypeInfo(
         public bool TryGetValidatableTypeInfo(global::System.Type type, [global::System.Diagnostics.CodeAnalysis.NotNullWhen(true)] out global::Microsoft.AspNetCore.Http.Validation.IValidatableInfo? validatableInfo)
         {
             validatableInfo = null;
+            if (type == typeof(global::TestService))
+            {
+                validatableInfo = CreateTestService();
+                return true;
+            }
 
             return false;
         }
@@ -71,6 +76,20 @@ public bool TryGetValidatableParameterInfo(global::System.Reflection.ParameterIn
             return false;
         }
 
+        private ValidatableTypeInfo CreateTestService()
+        {
+            return new GeneratedValidatableTypeInfo(
+                type: typeof(global::TestService),
+                members: [
+                    new GeneratedValidatablePropertyInfo(
+                        containingType: typeof(global::TestService),
+                        propertyType: typeof(int),
+                        name: "Value",
+                        displayName: "Value"
+                    ),
+                ]
+            );
+        }
 
     }
 

src/Http/Routing/src/ValidationEndpointFilterFactory.cs

@@ -2,7 +2,9 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.ComponentModel.DataAnnotations;
+using System.Linq;
 using System.Reflection;
+using Microsoft.AspNetCore.Http.Metadata;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
 
@@ -19,13 +21,21 @@ public static EndpointFilterDelegate Create(EndpointFilterFactoryContext context
             return next;
         }
 
+        var serviceProviderIsService = context.ApplicationServices.GetService<IServiceProviderIsService>();
+
         var parameterCount = parameters.Length;
         var validatableParameters = new IValidatableInfo[parameterCount];
         var parameterDisplayNames = new string[parameterCount];
         var hasValidatableParameters = false;
 
         for (var i = 0; i < parameterCount; i++)
         {
+            // Ignore parameters that are resolved from the DI container.
+            if (IsServiceParameter(parameters[i], serviceProviderIsService))
+            {
+                continue;
+            }
+
             if (options.TryGetValidatableParameterInfo(parameters[i], out var validatableParameter))
             {
                 validatableParameters[i] = validatableParameter;
@@ -70,6 +80,13 @@ public static EndpointFilterDelegate Create(EndpointFilterFactoryContext context
         };
     }
 
+    private static bool IsServiceParameter(ParameterInfo parameterInfo, IServiceProviderIsService? isService)
+        => HasFromServicesAttribute(parameterInfo) ||
+           (isService?.IsService(parameterInfo.ParameterType) == true);
+
+    private static bool HasFromServicesAttribute(ParameterInfo parameterInfo)
+        => parameterInfo.CustomAttributes.OfType<IFromServiceMetadata>().Any();
+
     private static string GetDisplayName(ParameterInfo parameterInfo)
     {
         var displayAttribute = parameterInfo.GetCustomAttribute<DisplayAttribute>();