Merge pull request #4290 from AvaloniaUI/fixes/unable-to-bind-where-application-provides-datacontext

Fixes/unable to bind where application provides datacontext

src/Markup/Avalonia.Markup/Data/BindingBase.cs

@@ -137,9 +137,9 @@ namespace Avalonia.Data
         {
             Contract.Requires<ArgumentNullException>(target != null);
 
-            if (!(target is IStyledElement))
+            if (!(target is IDataContextProvider))
             {
-                target = anchor as IStyledElement;
+                target = anchor as IDataContextProvider;
 
                 if (target == null)
                 {

tests/Avalonia.Controls.UnitTests/ApplicationTests.cs

@@ -1,6 +1,5 @@
 using System;
-using System.Collections.Generic;
-using Avalonia.Threading;
+using Avalonia.Data;
 using Avalonia.UnitTests;
 using Xunit;
 
@@ -32,5 +31,20 @@ namespace Avalonia.Controls.UnitTests
                 Assert.True(raised);
             }
         }
+
+        [Fact]
+        public void Can_Bind_To_DataContext()
+        {
+            using (UnitTestApplication.Start())
+            {
+                var application = Application.Current;
+
+                application.DataContext = "Test";
+
+                application.Bind(Application.NameProperty, new Binding("."));
+
+                Assert.Equal("Test", Application.Current.Name);
+            }
+        }
     }
 }