Add new AST node generated from x:DataContextType. To be used as part of compiled bindings.

src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj

@@ -43,9 +43,10 @@
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlAvaloniaPropertyResolver.cs" />
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlConstructorServiceProviderTransformer.cs" />
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlControlTemplateTargetTypeMetadataTransformer.cs" />
+        <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlDataContextTypeTransformer.cs" />
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlDesignPropertiesTransformer.cs" />
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlMetadataRemover.cs" />
-        <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlPropertyPathTransformer.cs"/>
+        <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlPropertyPathTransformer.cs" />
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlTransformInstanceAttachedProperties.cs" />
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlTransitionsTypeMetadataTransformer.cs" />
         <Compile Include="XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlWellKnownTypes.cs" />

src/Markup/Avalonia.Markup.Xaml/XamlIl/CompilerExtensions/AvaloniaXamlIlCompiler.cs

@@ -48,7 +48,8 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
                 new AvaloniaXamlIlSetterTransformer(),
                 new AvaloniaXamlIlControlTemplateTargetTypeMetadataTransformer(),
                 new AvaloniaXamlIlConstructorServiceProviderTransformer(),
-                new AvaloniaXamlIlTransitionsTypeMetadataTransformer()
+                new AvaloniaXamlIlTransitionsTypeMetadataTransformer(),
+                new AvaloniaXamlIlDataContextTypeTransformer()
             );
             
             // After everything else

src/Markup/Avalonia.Markup.Xaml/XamlIl/CompilerExtensions/Transformers/AvaloniaXamlIlDataContextTypeTransformer.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using XamlIl;
+using XamlIl.Ast;
+using XamlIl.Transform;
+
+namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
+{
+    class AvaloniaXamlIlDataContextTypeTransformer : IXamlIlAstTransformer
+    {
+        public IXamlIlAstNode Transform(XamlIlAstTransformationContext context, IXamlIlAstNode node)
+        {
+            if (node is XamlIlAstObjectNode on)
+            {
+                foreach (var child in on.Children)
+                {
+                    if (child is XamlIlAstXmlDirective directive)
+                    {
+                        if (directive.Namespace == XamlNamespaces.Xaml2006
+                            && directive.Name == "DataContextType"
+                            && directive.Values.Count == 1
+                            && directive.Values[0] is XamlIlTypeExtensionNode dataContextType)
+                        {
+                            on.Children.Remove(child);
+                            return new AvaloniaXamlIlDataContextTypeMetadataNode(on, dataContextType.Value);
+                        }
+                    }
+                }
+            }
+
+            return node;
+        }
+    }
+
+    class AvaloniaXamlIlDataContextTypeMetadataNode : XamlIlValueWithSideEffectNodeBase
+    {
+        public IXamlIlAstTypeReference DataContextType { get; set; }
+
+        public AvaloniaXamlIlDataContextTypeMetadataNode(IXamlIlAstValueNode value, IXamlIlAstTypeReference targetType)
+            : base(value, value)
+        {
+            DataContextType = targetType;
+        }
+    }
+}

src/Markup/Avalonia.Markup.Xaml/XamlIl/CompilerExtensions/Transformers/AvaloniaXamlIlMetadataRemover.cs

@@ -8,8 +8,11 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
     {
         public IXamlIlAstNode Transform(XamlIlAstTransformationContext context, IXamlIlAstNode node)
         {
-            if (node is AvaloniaXamlIlTargetTypeMetadataNode md)
-                return md.Value;
+            if (node is AvaloniaXamlIlTargetTypeMetadataNode targetTypeMetadata)
+                return targetTypeMetadata.Value;
+
+            if (node is AvaloniaXamlIlDataContextTypeMetadataNode dataContextTypeMetadata)
+                return dataContextTypeMetadata.Value;
 
             return node;
         }