simplify new expression

src/Shared/HandyControl_Shared/Controls/PropertyGrid/PropertyGrid.cs

@@ -33,7 +33,7 @@ namespace HandyControl.Controls
             CommandBindings.Add(new CommandBinding(ControlCommands.SortByName, SortByName, (s, e) => e.CanExecute = ShowSortButton));
         }
 
-        public virtual PropertyResolver PropertyResolver { get; } = new PropertyResolver();
+        public virtual PropertyResolver PropertyResolver { get; } = new();
 
         public static readonly RoutedEvent SelectedObjectChangedEvent =
             EventManager.RegisterRoutedEvent("SelectedObjectChanged", RoutingStrategy.Bubble,
@@ -181,7 +181,7 @@ namespace HandyControl.Controls
             }
         }
 
-        protected virtual PropertyItem CreatePropertyItem(PropertyDescriptor propertyDescriptor) => new PropertyItem
+        protected virtual PropertyItem CreatePropertyItem(PropertyDescriptor propertyDescriptor) => new()
         {
             Category = PropertyResolver.ResolveCategory(propertyDescriptor),
             DisplayName = PropertyResolver.ResolveDisplayName(propertyDescriptor),

src/Shared/HandyControl_Shared/Controls/PropertyGrid/PropertyResolver.cs

@@ -10,7 +10,7 @@ namespace HandyControl.Controls
 {
     public class PropertyResolver
     {
-        private static readonly Dictionary<Type, EditorTypeCode> TypeCodeDic = new Dictionary<Type, EditorTypeCode>
+        private static readonly Dictionary<Type, EditorTypeCode> TypeCodeDic = new()
         {
             [typeof(string)] = EditorTypeCode.PlainText,
             [typeof(sbyte)] = EditorTypeCode.SByteNumber,