Replace TypeInfo with Type.

src/Avalonia.Base/AvaloniaProperty.cs

@@ -3,9 +3,7 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Reactive.Subjects;
-using System.Reflection;
 using Avalonia.Data;
 using Avalonia.Utilities;
 
@@ -602,7 +600,7 @@ namespace Avalonia
                     return result;
                 }
 
-                currentType = currentType.GetTypeInfo().BaseType;
+                currentType = currentType.BaseType;
             }
 
             _metadataCache[type] = _defaultMetadata;

src/Avalonia.Base/Utilities/TypeUtilities.cs

@@ -92,8 +92,7 @@ namespace Avalonia.Utilities
         /// <returns>True if the type accepts null values; otherwise false.</returns>
         public static bool AcceptsNull(Type type)
         {
-            var t = type.GetTypeInfo();
-            return !t.IsValueType || (t.IsGenericType && (t.GetGenericTypeDefinition() == typeof(Nullable<>)));
+            return !type.IsValueType || IsNullableType(type);
         }
 
         /// <summary>
@@ -119,10 +118,8 @@ namespace Avalonia.Utilities
             }
 
             var from = value.GetType();
-            var fromTypeInfo = from.GetTypeInfo();
-            var toTypeInfo = to.GetTypeInfo();
 
-            if (toTypeInfo.IsAssignableFrom(fromTypeInfo))
+            if (to.IsAssignableFrom(from))
             {
                 result = value;
                 return true;
@@ -134,7 +131,7 @@ namespace Avalonia.Utilities
                 return true;
             }
 
-            if (toTypeInfo.IsEnum && from == typeof(string))
+            if (to.IsEnum && from == typeof(string))
             {
                 if (Enum.IsDefined(to, (string)value))
                 {
@@ -143,7 +140,7 @@ namespace Avalonia.Utilities
                 }
             }
 
-            if (!fromTypeInfo.IsEnum && toTypeInfo.IsEnum)
+            if (!from.IsEnum && to.IsEnum)
             {
                 result = null;
 
@@ -154,7 +151,7 @@ namespace Avalonia.Utilities
                 }
             }
 
-            if (fromTypeInfo.IsEnum && IsNumeric(to))
+            if (from.IsEnum && IsNumeric(to))
             {
                 try
                 {
@@ -223,10 +220,8 @@ namespace Avalonia.Utilities
             }
 
             var from = value.GetType();
-            var fromTypeInfo = from.GetTypeInfo();
-            var toTypeInfo = to.GetTypeInfo();
 
-            if (toTypeInfo.IsAssignableFrom(fromTypeInfo))
+            if (to.IsAssignableFrom(from))
             {
                 result = value;
                 return true;
@@ -307,9 +302,7 @@ namespace Avalonia.Utilities
         /// <returns>The default value.</returns>
         public static object Default(Type type)
         {
-            var typeInfo = type.GetTypeInfo();
-
-            if (typeInfo.IsValueType)
+            if (type.IsValueType)
             {
                 return Activator.CreateInstance(type);
             }
@@ -335,9 +328,11 @@ namespace Avalonia.Utilities
                 return false;
             }
 
-            if (type.GetTypeInfo().IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
+            Type underlyingType = Nullable.GetUnderlyingType(type);
+
+            if (underlyingType != null)
             {
-                return IsNumeric(Nullable.GetUnderlyingType(type));
+                return IsNumeric(underlyingType);
             }
             else
             {
@@ -352,6 +347,11 @@ namespace Avalonia.Utilities
             Explicit = 2
         }
 
+        private static bool IsNullableType(Type type)
+        {
+            return type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
+        }
+
         private static MethodInfo FindTypeConversionOperatorMethod(Type fromType, Type toType, OperatorType operatorType)
         {
             const string implicitName = "op_Implicit";