ConfigurationBinder.Bind on virtual properties duplicates elements

src/libraries/Microsoft.Extensions.Configuration.Binder/src/ConfigurationBinder.cs

@@ -204,7 +204,7 @@ public static void Bind(this IConfiguration configuration, object? instance, Act
         [RequiresUnreferencedCode(PropertyTrimmingWarningMessage)]
         private static void BindNonScalar(this IConfiguration configuration, object instance, BinderOptions options)
         {
-            List<PropertyInfo> modelProperties = GetAllProperties(instance.GetType());
+            PropertyInfo[] modelProperties = GetAllProperties(instance.GetType());
 
             if (options.ErrorOnUnknownConfiguration)
             {
@@ -451,7 +451,7 @@ private static object CreateInstance(
                 }
 
 
-                List<PropertyInfo> properties = GetAllProperties(type);
+                PropertyInfo[] properties = GetAllProperties(type);
 
                 if (!DoAllParametersHaveEquivalentProperties(parameters, properties, out string nameOfInvalidParameters))
                 {
@@ -482,7 +482,7 @@ private static object CreateInstance(
         }
 
         private static bool DoAllParametersHaveEquivalentProperties(ParameterInfo[] parameters,
-            List<PropertyInfo> properties, out string missing)
+            PropertyInfo[] properties, out string missing)
         {
             HashSet<string> propertyNames = new(StringComparer.OrdinalIgnoreCase);
             foreach (PropertyInfo prop in properties)
@@ -752,22 +752,8 @@ private static bool IsArrayCompatibleReadOnlyInterface(Type type)
             return null;
         }
 
-        private static List<PropertyInfo> GetAllProperties(
-            [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
-            Type type)
-        {
-            var allProperties = new List<PropertyInfo>();
-
-            Type? baseType = type;
-            do
-            {
-                allProperties.AddRange(baseType!.GetProperties(DeclaredOnlyLookup));
-                baseType = baseType.BaseType;
-            }
-            while (baseType != typeof(object));
-
-            return allProperties;
-        }
+        private static PropertyInfo[] GetAllProperties([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] Type type)
+            => type.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
 
         [RequiresUnreferencedCode(PropertyTrimmingWarningMessage)]
         private static object? BindParameter(ParameterInfo parameter, Type type, IConfiguration config,

src/libraries/Microsoft.Extensions.Configuration.Binder/tests/ConfigurationBinderTests.cs

@@ -1750,6 +1750,21 @@ public void CanBindNullableNestedStructProperties()
             Assert.True(bound.NullableNestedStruct.Value.DeeplyNested.Boolean);
         }
 
+        [Fact]
+        public void CanBindVirtualPropertiesWithoutDuplicates()
+        {
+            ConfigurationBuilder configurationBuilder = new();
+            configurationBuilder.AddInMemoryCollection(new Dictionary<string, string>
+            {
+                { "Test:0", "1" }
+            });
+            IConfiguration config = configurationBuilder.Build();
+
+            var test = new ClassOverridingVirtualProperty();
+            config.Bind(test);
+            Assert.Equal("1", Assert.Single(test.Test));
+        }
+
 
         private interface ISomeInterface
         {
@@ -1827,5 +1842,15 @@ public struct DeeplyNested
                 public bool Boolean { get; set; }
             }
         }
+
+        public class BaseClassWithVirtualProperty
+        {
+            public virtual string[] Test { get; set; } = System.Array.Empty<string>();
+        }
+
+        public class ClassOverridingVirtualProperty : BaseClassWithVirtualProperty
+        {
+            public override string[] Test { get => base.Test; set => base.Test = value; }
+        }
     }
 }