diff --git a/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs b/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs
index 23e8bb6187..ede016465c 100644
--- a/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs
+++ b/src/Microsoft.AspNetCore.Mvc.ApiExplorer/DefaultApiDescriptionProvider.cs
@@ -162,7 +162,23 @@ namespace Microsoft.AspNetCore.Mvc.ApiExplorer
                 foreach (var actionParameter in context.ActionDescriptor.Parameters)
                 {
                     var visitor = new PseudoModelBindingVisitor(context, actionParameter);
-                    var metadata = _modelMetadataProvider.GetMetadataForType(actionParameter.ParameterType);
+
+                    ModelMetadata metadata = null;
+                    if (actionParameter is ControllerParameterDescriptor controllerParameterDescriptor &&
+                        _modelMetadataProvider is ModelMetadataProvider provider)
+                    {
+                        // The default model metadata provider derives from ModelMetadataProvider
+                        // and can therefore supply information about attributes applied to parameters.
+                        metadata = provider.GetMetadataForParameter(controllerParameterDescriptor.ParameterInfo);
+                    }
+                    else
+                    {
+                        // For backward compatibility, if there's a custom model metadata provider that
+                        // only implements the older IModelMetadataProvider interface, access the more
+                        // limited metadata information it supplies. In this scenario, validation attributes
+                        // are not supported on parameters.
+                        metadata = _modelMetadataProvider.GetMetadataForType(actionParameter.ParameterType);
+                    }
 
                     var bindingContext = ApiParameterDescriptionContext.GetContext(
                         metadata,
diff --git a/src/Microsoft.AspNetCore.Mvc.RazorPages/DependencyInjection/MvcRazorPagesMvcCoreBuilderExtensions.cs b/src/Microsoft.AspNetCore.Mvc.RazorPages/DependencyInjection/MvcRazorPagesMvcCoreBuilderExtensions.cs
index 7b976eafcd..8d6e48bb0e 100644
--- a/src/Microsoft.AspNetCore.Mvc.RazorPages/DependencyInjection/MvcRazorPagesMvcCoreBuilderExtensions.cs
+++ b/src/Microsoft.AspNetCore.Mvc.RazorPages/DependencyInjection/MvcRazorPagesMvcCoreBuilderExtensions.cs
@@ -118,7 +118,9 @@ namespace Microsoft.Extensions.DependencyInjection
             services.TryAddSingleton<IPageHandlerMethodSelector, DefaultPageHandlerMethodSelector>();
 
             // Page model binding
+#pragma warning disable CS0618 // Type or member is obsolete
             services.TryAddSingleton<PageArgumentBinder, DefaultPageArgumentBinder>();
+#pragma warning restore CS0618 // Type or member is obsolete
 
             // Action executors
             services.TryAddSingleton<PageResultExecutor>();
diff --git a/src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/PageArgumentBinder.cs b/src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/PageArgumentBinder.cs
index 9af8eedfd4..a4d8f5cba6 100644
--- a/src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/PageArgumentBinder.cs
+++ b/src/Microsoft.AspNetCore.Mvc.RazorPages/Infrastructure/PageArgumentBinder.cs
@@ -7,6 +7,7 @@ using Microsoft.AspNetCore.Mvc.ModelBinding;
 
 namespace Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure
 {
+    [Obsolete("This type is obsolete and will be removed in a future version.")]
     public abstract class PageArgumentBinder
     {
         public async Task<object> BindModelAsync(PageContext context, Type type, object @default, string name)
diff --git a/src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/DefaultPageArgumentBinder.cs b/src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/DefaultPageArgumentBinder.cs
index 67218d4e8a..7b3310bbdd 100644
--- a/src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/DefaultPageArgumentBinder.cs
+++ b/src/Microsoft.AspNetCore.Mvc.RazorPages/Internal/DefaultPageArgumentBinder.cs
@@ -9,7 +9,9 @@ using Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure;
 
 namespace Microsoft.AspNetCore.Mvc.RazorPages.Internal
 {
+#pragma warning disable CS0618 // Type or member is obsolete
     public class DefaultPageArgumentBinder : PageArgumentBinder
+#pragma warning restore CS0618 // Type or member is obsolete
     {
         private readonly ParameterBinder _parameterBinder;
 
diff --git a/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/DefaultApiDescriptionProviderTest.cs b/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/DefaultApiDescriptionProviderTest.cs
index 04a1cf9d50..8ef866008a 100644
--- a/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/DefaultApiDescriptionProviderTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.ApiExplorer.Test/DefaultApiDescriptionProviderTest.cs
@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using System.Reflection;
 using System.Text;
@@ -912,6 +913,25 @@ namespace Microsoft.AspNetCore.Mvc.Description
             Assert.Equal(typeof(string), parameter.Type);
         }
 
+        [Fact]
+        public void GetApiDescription_ParameterDescription_IsRequired()
+        {
+            // Arrange
+            var action = CreateActionDescriptor(nameof(RequiredParameter));
+
+            // Act
+            var descriptions = GetApiDescriptions(action);
+
+            // Assert
+            var description = Assert.Single(descriptions);
+            var parameter = Assert.Single(description.ParameterDescriptions);
+            Assert.Equal("name", parameter.Name);
+            Assert.Same(BindingSource.ModelBinding, parameter.Source);
+            Assert.Equal(typeof(string), parameter.Type);
+            Assert.True(parameter.ModelMetadata.IsRequired);
+            Assert.True(parameter.ModelMetadata.IsBindingRequired);
+        }
+
         [Fact]
         public void GetApiDescription_ParameterDescription_SourceFromRouteData()
         {
@@ -1472,11 +1492,12 @@ namespace Microsoft.AspNetCore.Mvc.Description
             action.Parameters = new List<ParameterDescriptor>();
             foreach (var parameter in action.MethodInfo.GetParameters())
             {
-                action.Parameters.Add(new ParameterDescriptor()
+                action.Parameters.Add(new ControllerParameterDescriptor()
                 {
                     Name = parameter.Name,
                     ParameterType = parameter.ParameterType,
-                    BindingInfo = BindingInfo.GetBindingInfo(parameter.GetCustomAttributes().OfType<object>())
+                    BindingInfo = BindingInfo.GetBindingInfo(parameter.GetCustomAttributes().OfType<object>()),
+                    ParameterInfo = parameter
                 });
             }
 
@@ -1552,6 +1573,10 @@ namespace Microsoft.AspNetCore.Mvc.Description
         {
         }
 
+        private void RequiredParameter([BindRequired, Required] string name)
+        {
+        }
+
         private void AcceptsProduct_Body([FromBody] Product product)
         {
         }
diff --git a/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/Internal/ExecutorFactoryTest.cs b/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/Internal/ExecutorFactoryTest.cs
index f0339d2018..a5a58227e0 100644
--- a/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/Internal/ExecutorFactoryTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/Internal/ExecutorFactoryTest.cs
@@ -327,14 +327,5 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages.Test.Internal
                 throw new NotImplementedException();
             }
         }
-
-        private class MockBinder : PageArgumentBinder
-        {
-            protected override Task<ModelBindingResult> BindAsync(PageContext context, object value, string name, Type type)
-            {
-                var result = ModelBindingResult.Failed();
-                return Task.FromResult(result);
-            }
-        }
     }
 }
diff --git a/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/PageModelTest.cs b/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/PageModelTest.cs
index 11391095e5..6d0913d394 100644
--- a/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/PageModelTest.cs
+++ b/test/Microsoft.AspNetCore.Mvc.RazorPages.Test/PageModelTest.cs
@@ -1942,13 +1942,5 @@ namespace Microsoft.AspNetCore.Mvc.RazorPages
                 throw new NotImplementedException();
             }
         }
-
-        private class TestPageArgumentBinder : PageArgumentBinder
-        {
-            protected override Task<ModelBindingResult> BindAsync(PageContext context, object value, string name, Type type)
-            {
-                return Task.FromResult(ModelBindingResult.Success(Guid.NewGuid()));
-            }
-        }
     }
 }