Implement runtime-based IValidatableTypeInfoResolver for minimal API validation

src/Validation/src/Microsoft.Extensions.Validation.csproj

@@ -12,6 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <Reference Include="Microsoft.AspNetCore.Http.Abstractions" />
     <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
     <Reference Include="Microsoft.Extensions.Options" />
   </ItemGroup>

src/Validation/src/PublicAPI.Unshipped.txt

@@ -45,7 +45,11 @@ Microsoft.Extensions.Validation.ValidationOptions.TryGetValidatableTypeInfo(Syst
 Microsoft.Extensions.Validation.ValidationOptions.ValidationOptions() -> void
 abstract Microsoft.Extensions.Validation.ValidatableParameterInfo.GetValidationAttributes() -> System.ComponentModel.DataAnnotations.ValidationAttribute![]!
 abstract Microsoft.Extensions.Validation.ValidatablePropertyInfo.GetValidationAttributes() -> System.ComponentModel.DataAnnotations.ValidationAttribute![]!
+Microsoft.Extensions.Validation.RuntimeValidatableTypeInfoResolver
+Microsoft.Extensions.Validation.RuntimeValidatableTypeInfoResolver.RuntimeValidatableTypeInfoResolver() -> void
+Microsoft.Extensions.Validation.RuntimeValidatableTypeInfoResolver.TryGetValidatableParameterInfo(System.Reflection.ParameterInfo! parameterInfo, out Microsoft.Extensions.Validation.IValidatableInfo? validatableInfo) -> bool
+Microsoft.Extensions.Validation.RuntimeValidatableTypeInfoResolver.TryGetValidatableTypeInfo(System.Type! type, out Microsoft.Extensions.Validation.IValidatableInfo? info) -> bool
 static Microsoft.Extensions.DependencyInjection.ValidationServiceCollectionExtensions.AddValidation(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services, System.Action<Microsoft.Extensions.Validation.ValidationOptions!>? configureOptions = null) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
 virtual Microsoft.Extensions.Validation.ValidatableParameterInfo.ValidateAsync(object? value, Microsoft.Extensions.Validation.ValidateContext! context, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task!
 virtual Microsoft.Extensions.Validation.ValidatablePropertyInfo.ValidateAsync(object? value, Microsoft.Extensions.Validation.ValidateContext! context, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task!
-virtual Microsoft.Extensions.Validation.ValidatableTypeInfo.ValidateAsync(object? value, Microsoft.Extensions.Validation.ValidateContext! context, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task!
+virtual Microsoft.Extensions.Validation.ValidatableTypeInfo.ValidateAsync(object? value, Microsoft.Extensions.Validation.ValidateContext! context, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task!

src/Validation/src/RuntimeValidatableParameterInfoResolver.cs

@@ -9,6 +9,8 @@
 using System.Linq;
 using System.Reflection;
 using System.Security.Claims;
+using Microsoft.AspNetCore.Http.Metadata;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace Microsoft.Extensions.Validation;
 
@@ -28,6 +30,13 @@ public bool TryGetValidatableParameterInfo(ParameterInfo parameterInfo, [NotNull
             throw new InvalidOperationException($"Encountered a parameter of type '{parameterInfo.ParameterType}' without a name. Parameters must have a name.");
         }
 
+        // Skip parameters marked with [FromService] or [FromKeyedService] attributes
+        if (HasFromServiceAttributes(parameterInfo.GetCustomAttributes()))
+        {
+            validatableInfo = null;
+            return false;
+        }
+
         var validationAttributes = parameterInfo
             .GetCustomAttributes<ValidationAttribute>()
             .ToArray();
@@ -60,18 +69,6 @@ private static string GetDisplayName(ParameterInfo parameterInfo)
         return parameterInfo.Name!;
     }
 
-    internal sealed class RuntimeValidatableParameterInfo(
-        Type parameterType,
-        string name,
-        string displayName,
-        ValidationAttribute[] validationAttributes) :
-            ValidatableParameterInfo(parameterType, name, displayName)
-    {
-        protected override ValidationAttribute[] GetValidationAttributes() => _validationAttributes;
-
-        private readonly ValidationAttribute[] _validationAttributes = validationAttributes;
-    }
-
     private static bool IsClass(Type type)
     {
         // Skip primitives, enums, common built-in types, and types that are specially
@@ -102,4 +99,23 @@ private static bool IsClass(Type type)
 
         return type.IsClass;
     }
-}
+
+    private static bool HasFromServiceAttributes(IEnumerable<Attribute> attributes)
+    {
+        return attributes.Any(attr =>
+            attr is IFromServiceMetadata ||
+            attr is FromKeyedServicesAttribute);
+    }
+
+    internal sealed class RuntimeValidatableParameterInfo(
+        Type parameterType,
+        string name,
+        string displayName,
+        ValidationAttribute[] validationAttributes) :
+            ValidatableParameterInfo(parameterType, name, displayName)
+    {
+        protected override ValidationAttribute[] GetValidationAttributes() => _validationAttributes;
+
+        private readonly ValidationAttribute[] _validationAttributes = validationAttributes;
+    }
+}