Fixed #2561

src/Avalonia.Build.Tasks/Program.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.IO;
+using System.Linq;
 using Microsoft.Build.Framework;
 
 namespace Avalonia.Build.Tasks
@@ -11,8 +12,14 @@ namespace Avalonia.Build.Tasks
         {
             if (args.Length != 3)
             {
-                Console.Error.WriteLine("input references output");
-                return 1;
+                if (args.Length == 1)
+                    args = new[] {"original.dll", "references", "out.dll"}
+                        .Select(x => Path.Combine(args[0], x)).ToArray();
+                else
+                {
+                    Console.Error.WriteLine("input references output");
+                    return 1;
+                }
             }
 
             return new CompileAvaloniaXamlTask()

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

@@ -64,7 +64,7 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions
                 
                 var tref = XamlIlTypeReferenceResolver.ResolveType(context, xmlOwner, false, lineInfo, true);
                 forgedReference = new XamlIlAstNamePropertyReference(lineInfo,
-                    tref, parsedPropertyName.name, tref);
+                    tref, parsedPropertyName.name, selectorTypeReference);
             }
 
             var clrProperty =

tests/Avalonia.Markup.Xaml.UnitTests/Xaml/XamlIlTests.cs

@@ -207,6 +207,33 @@ namespace Avalonia.Markup.Xaml.UnitTests
     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'/>", typeof(XamlIlTests).Assembly);
             Assert.Equal(Design.GetDataContext(loaded), SomeStaticProperty);
         }
+        
+        [Fact]
+        public void Attached_Properties_From_Static_Types_Should_Work_In_Style_Setters_Bug_2561()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+
+                var parsed = (Window)AvaloniaXamlLoader.Parse(@"
+<Window
+  xmlns='https://github.com/avaloniaui'
+  xmlns:local='clr-namespace:Avalonia.Markup.Xaml.UnitTests;assembly=Avalonia.Markup.Xaml.UnitTests'
+>
+  <Window.Styles>
+    <Style Selector='TextBox'>
+      <Setter Property='local:XamlIlBugTestsStaticClassWithAttachedProperty.TestInt' Value='100'/>
+    </Style>
+  </Window.Styles>
+  <TextBox/>
+
+</Window>
+");
+                var tb = ((TextBox)parsed.Content);
+                parsed.Show();
+                tb.ApplyTemplate();
+                Assert.Equal(100, XamlIlBugTestsStaticClassWithAttachedProperty.GetTestInt(tb));
+            }
+        }
     }
     
     public class XamlIlBugTestsEventHandlerCodeBehind : Window
@@ -272,4 +299,19 @@ namespace Avalonia.Markup.Xaml.UnitTests
     {
     }
 
+    public static class XamlIlBugTestsStaticClassWithAttachedProperty
+    {
+        public static readonly AvaloniaProperty TestIntProperty = AvaloniaProperty
+            .RegisterAttached<Control, int>("TestInt", typeof(XamlIlBugTestsStaticClassWithAttachedProperty));
+
+        public static void SetTestInt(Control control, int value)
+        {
+            control.SetValue(TestIntProperty, value);
+        }
+
+        public static int GetTestInt(Control control)
+        {
+            return (int)control.GetValue(TestIntProperty);
+        }
+    }
 }