Add nullability to CreateInstance in TypeDescriptor/TypeDescriptionProvider to match Activator.CreateInstance

src/libraries/System.ComponentModel.TypeConverter/ref/System.ComponentModel.TypeConverter.cs

@@ -1382,7 +1382,7 @@ public abstract partial class TypeDescriptionProvider
  {
  protected TypeDescriptionProvider() { }
  protected TypeDescriptionProvider(System.ComponentModel.TypeDescriptionProvider parent) { }
- public virtual object? CreateInstance(System.IServiceProvider? provider, [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)] System.Type objectType, System.Type[]? argTypes, object[]? args) { throw null; }
+ public virtual object? CreateInstance(System.IServiceProvider? provider, [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)] System.Type objectType, System.Type[]? argTypes, object?[]? args) { throw null; }
  public virtual System.Collections.IDictionary? GetCache(object instance) { throw null; }
  [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute("The Type of instance cannot be statically discovered.")]
  public virtual System.ComponentModel.ICustomTypeDescriptor GetExtendedTypeDescriptor(object instance) { throw null; }
@@ -1434,7 +1434,7 @@ public static void CreateAssociation(object primary, object secondary) { }
  public static System.ComponentModel.Design.IDesigner? CreateDesigner(System.ComponentModel.IComponent component, System.Type designerBaseType) { throw null; }
  public static System.ComponentModel.EventDescriptor CreateEvent([System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.All)] System.Type componentType, System.ComponentModel.EventDescriptor oldEventDescriptor, params System.Attribute[] attributes) { throw null; }
  public static System.ComponentModel.EventDescriptor CreateEvent([System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.All)] System.Type componentType, string name, System.Type type, params System.Attribute[] attributes) { throw null; }
- public static object? CreateInstance(System.IServiceProvider? provider, [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)] System.Type objectType, System.Type[]? argTypes, object[]? args) { throw null; }
+ public static object? CreateInstance(System.IServiceProvider? provider, [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)] System.Type objectType, System.Type[]? argTypes, object?[]? args) { throw null; }
  [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute("PropertyDescriptor's PropertyType cannot be statically discovered.")]
  public static System.ComponentModel.PropertyDescriptor CreateProperty([System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.All)] System.Type componentType, System.ComponentModel.PropertyDescriptor oldPropertyDescriptor, params System.Attribute[] attributes) { throw null; }
  [System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute("PropertyDescriptor's PropertyType cannot be statically discovered.")]

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/DelegatingTypeDescriptionProvider.cs

@@ -36,7 +36,7 @@ internal DelegatingTypeDescriptionProvider(Type type)
  IServiceProvider? provider,
  [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
  Type[]? argTypes,
- object[]? args)
+ object?[]? args)
  {
  return Provider.CreateInstance(provider, objectType, argTypes, args);
  }

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/ReflectTypeDescriptionProvider.cs

@@ -260,7 +260,7 @@ internal static void AddEditorTable(Type editorBaseType, Hashtable table)
  IServiceProvider? provider,
  [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
  Type[]? argTypes,
- object[]? args)
+ object?[]? args)
  {
  Debug.Assert(objectType != null, "Should have arg-checked before coming in here");
 
@@ -277,9 +277,9 @@ internal static void AddEditorTable(Type editorBaseType, Hashtable table)
  argTypes = new Type[args.Length];
  for (int idx = 0; idx < args.Length; idx++)
  {
- if (args[idx] != null)
+ if (args[idx] is object arg)
  {
- argTypes[idx] = args[idx].GetType();
+ argTypes[idx] = arg.GetType();
  }
  else
  {

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/TypeDescriptionProvider.cs

@@ -54,7 +54,7 @@ protected TypeDescriptionProvider(TypeDescriptionProvider parent)
  IServiceProvider? provider,
  [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
  Type[]? argTypes,
- object[]? args)
+ object?[]? args)
  {
  if (_parent != null)
  {

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/TypeDescriptor.cs

@@ -395,7 +395,7 @@ public static EventDescriptor CreateEvent(
  IServiceProvider? provider,
  [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
  Type[]? argTypes,
- object[]? args)
+ object?[]? args)
  {
  ArgumentNullException.ThrowIfNull(objectType);
 
@@ -3015,7 +3015,7 @@ internal TypeDescriptionNode(TypeDescriptionProvider provider)
  IServiceProvider? provider,
  [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type objectType,
  Type[]? argTypes,
- object[]? args)
+ object?[]? args)
  {
  ArgumentNullException.ThrowIfNull(objectType);