PR Feedback.

src/Markup/Avalonia.Markup/Data/Plugins/MethodAccessorPlugin.cs

@@ -82,11 +82,6 @@ namespace Avalonia.Markup.Data.Plugins
                 }
                 catch { }
             }
-
-            private void SendCurrentValue()
-            {
-
-            }
         }
     }
 }

src/Markup/Avalonia.Markup/DefaultValueConverter.cs

@@ -35,7 +35,7 @@ namespace Avalonia.Markup
                 return AvaloniaProperty.UnsetValue;
             }
 
-            if (typeof(ICommand).IsAssignableFrom(targetType) && value is Delegate d)
+            if (typeof(ICommand).IsAssignableFrom(targetType) && value is Delegate d && d.Method.GetParameters().Length <= 1)
             {
                 return new AlwaysEnabledDelegateCommand(d);
             }

tests/Avalonia.Markup.Xaml.UnitTests/Data/BindingTests_Method.cs

@@ -0,0 +1,106 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
+using System.Reactive.Subjects;
+using System.Windows.Input;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.UnitTests;
+using Xunit;
+
+namespace Avalonia.Markup.Xaml.UnitTests.Data
+{
+    public class BindingTests_Method
+    {
+        [Fact]
+        public void Binding_Method_To_Command_Works()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var xaml = @"
+<Window xmlns='https://github.com/avaloniaui'
+        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
+        xmlns:local='clr-namespace:Avalonia.Markup.Xaml.UnitTests.Xaml;assembly=Avalonia.Markup.Xaml.UnitTests'>
+    <Button Name='button' Command='{Binding Method}'/>
+</Window>";
+                var loader = new AvaloniaXamlLoader();
+                var window = (Window)loader.Load(xaml);
+                var button = window.FindControl<Button>("button");
+                var vm = new ViewModel();
+
+                button.DataContext = vm;
+                window.ApplyTemplate();
+
+                Assert.NotNull(button.Command);
+                PerformClick(button);
+                Assert.Equal("Called", vm.Value);
+            }
+        }
+
+        [Fact]
+        public void Binding_Method_With_Parameter_To_Command_Works()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var xaml = @"
+<Window xmlns='https://github.com/avaloniaui'
+        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
+        xmlns:local='clr-namespace:Avalonia.Markup.Xaml.UnitTests.Xaml;assembly=Avalonia.Markup.Xaml.UnitTests'>
+    <Button Name='button' Command='{Binding Method1}' CommandParameter='5'/>
+</Window>";
+                var loader = new AvaloniaXamlLoader();
+                var window = (Window)loader.Load(xaml);
+                var button = window.FindControl<Button>("button");
+                var vm = new ViewModel();
+
+                button.DataContext = vm;
+                window.ApplyTemplate();
+
+                Assert.NotNull(button.Command);
+                PerformClick(button);
+                Assert.Equal("Called 5", vm.Value);
+            }
+        }
+
+        // Should this work or should it be a binding error?
+        [Fact]
+        public void Binding_Method_To_TextBlock_Text_Works()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var xaml = @"
+<Window xmlns='https://github.com/avaloniaui'
+        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
+        xmlns:local='clr-namespace:Avalonia.Markup.Xaml.UnitTests.Xaml;assembly=Avalonia.Markup.Xaml.UnitTests'>
+    <TextBlock Name='textBlock' Text='{Binding Method}'/>
+</Window>";
+                var loader = new AvaloniaXamlLoader();
+                var window = (Window)loader.Load(xaml);
+                var textBlock = window.FindControl<TextBlock>("textBlock");
+                var vm = new ViewModel();
+
+                textBlock.DataContext = vm;
+                window.ApplyTemplate();
+
+                Assert.NotNull(textBlock.Text);
+            }
+        }
+
+        static void PerformClick(Button button)
+        {
+            button.RaiseEvent(new KeyEventArgs
+            {
+                RoutedEvent = InputElement.KeyDownEvent,
+                Key = Input.Key.Enter,
+            });
+        }
+
+        private class ViewModel
+        {
+            public string Method() => Value = "Called";
+            public string Method1(int i) => Value = $"Called {i}";
+            public string Method2(int i, int j) => Value = $"Called {i},{j}";
+            public string Value { get; private set; } = "Not called";
+        }
+    }
+}