Enable COM autimation only when dynamic code is disabled

src/Windows/Avalonia.Win32/Automation/AutomationNode.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Linq;
 using System.Runtime.CompilerServices;
@@ -16,6 +17,7 @@ using AAP = Avalonia.Automation.Provider;
 namespace Avalonia.Win32.Automation
 {
     [ComVisible(true)]
+    [RequiresUnreferencedCode("Requires .NET COM interop")]
     internal partial class AutomationNode : MarshalByRefObject,
         IRawElementProviderSimple,
         IRawElementProviderSimple2,

src/Windows/Avalonia.Win32/Automation/RootAutomationNode.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 using Avalonia.Automation.Peers;
 using Avalonia.Automation.Provider;
@@ -9,6 +10,7 @@ using Avalonia.Win32.Interop.Automation;
 
 namespace Avalonia.Win32.Automation
 {
+    [RequiresUnreferencedCode("Requires .NET COM interop")]
     internal class RootAutomationNode : AutomationNode,
         IRawElementProviderFragmentRoot
     {

src/Windows/Avalonia.Win32/Avalonia.Win32.csproj

@@ -21,8 +21,8 @@
   </ItemGroup>
   <Import Project="$(MSBuildThisFileDirectory)\..\..\..\build\System.Drawing.Common.props" />
   <Import Project="..\..\..\build\DevAnalyzers.props" />
+  <Import Project="..\..\..\build\TrimmingEnable.props" />
   <PropertyGroup Label="Warnings">
-    <NoWarn Condition="'$(NoWarn)' == ''">CA1416</NoWarn>
-    <NoWarn Condition="'$(NoWarn)' != ''">$(NoWarn),CA1416</NoWarn>
+    <NoWarn>$(NoWarn);CA1416</NoWarn>
   </PropertyGroup>
 </Project>

src/Windows/Avalonia.Win32/DataObject.cs

@@ -2,6 +2,7 @@
 using System.Buffers;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
@@ -291,13 +292,16 @@ namespace Avalonia.Win32
             return WriteBytesToHGlobal(ref hGlobal, SerializeObject(data));
         }
 
+        [UnconditionalSuppressMessage("Trimming", "IL2026", Justification = "We still use BinaryFormatter for WinForms dragndrop compatability")]
         private static byte[] SerializeObject(object data)
         {
             using (var ms = new MemoryStream())
             {
                 ms.Write(SerializedObjectGUID, 0, SerializedObjectGUID.Length);
                 BinaryFormatter binaryFormatter = new BinaryFormatter();
+#pragma warning disable SYSLIB0011 // Type or member is obsolete
                 binaryFormatter.Serialize(ms, data);
+#pragma warning restore SYSLIB0011 // Type or member is obsolete
                 return ms.ToArray();
             }
         }

src/Windows/Avalonia.Win32/Interop/Automation/UiaCoreTypesApi.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 
 namespace Avalonia.Win32.Interop.Automation
@@ -21,11 +22,15 @@ namespace Avalonia.Win32.Interop.Automation
         internal const int UIA_E_NOCLICKABLEPOINT = unchecked((int)0x80040202);
         internal const int UIA_E_PROXYASSEMBLYNOTLOADED = unchecked((int)0x80040203);
 
+        private static bool? s_isNetComInteropAvailable;
+        internal static bool IsNetComInteropAvailable => s_isNetComInteropAvailable ??= GetIsNetComInteropAvailable();
+
         internal static int UiaLookupId(AutomationIdType type, ref Guid guid)
         {   
             return RawUiaLookupId( type, ref guid );
         }
 
+        [RequiresUnreferencedCode("Requires .NET COM interop")]
         internal static object UiaGetReservedNotSupportedValue()
         {
             object notSupportedValue;
@@ -33,6 +38,7 @@ namespace Avalonia.Win32.Interop.Automation
             return notSupportedValue;
         }
 
+        [RequiresUnreferencedCode("Requires .NET COM interop")]
         internal static object UiaGetReservedMixedAttributeValue()
         {
             object mixedAttributeValue;
@@ -49,6 +55,19 @@ namespace Avalonia.Win32.Interop.Automation
 
             Marshal.ThrowExceptionForHR(hr, (IntPtr)(-1));
         }
+        
+        private static bool GetIsNetComInteropAvailable()
+        {
+#if NET6_0_OR_GREATER
+            if (!System.Runtime.CompilerServices.RuntimeFeature.IsDynamicCodeSupported)
+            {
+                return false;
+            }
+#endif
+
+            var comConfig = AppContext.GetData("System.Runtime.InteropServices.BuiltInComInterop.IsSupported");
+            return comConfig == null || bool.Parse(comConfig.ToString());
+        }
 
         [DllImport("UIAutomationCore.dll", EntryPoint = "UiaLookupId", CharSet = CharSet.Unicode)]
         private static extern int RawUiaLookupId(AutomationIdType type, ref Guid guid);

src/Windows/Avalonia.Win32/NonPumpingSyncContext.cs

@@ -20,8 +20,10 @@ namespace Avalonia.Win32
 
         public override void Post(SendOrPostCallback d, object state) => _inner.Post(d, state);
         public override void Send(SendOrPostCallback d, object state) => _inner.Send(d, state);
-        
+
+#if !NET6_0_OR_GREATER
         [PrePrepareMethod]
+#endif
         public override int Wait(IntPtr[] waitHandles, bool waitAll, int millisecondsTimeout)
         {
             return UnmanagedMethods.WaitForMultipleObjectsEx(waitHandles.Length, waitHandles, waitAll,

src/Windows/Avalonia.Win32/OleDataObject.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Buffers;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
@@ -49,6 +50,7 @@ namespace Avalonia.Win32
             return GetDataFromOleHGLOBAL(dataFormat, DVASPECT.DVASPECT_CONTENT);
         }
 
+        [UnconditionalSuppressMessage("Trimming", "IL2026", Justification = "We still use BinaryFormatter for WinForms dragndrop compatability")]
         private unsafe object GetDataFromOleHGLOBAL(string format, DVASPECT aspect)
         {
             var formatEtc = new Interop.FORMATETC();
@@ -77,7 +79,9 @@ namespace Avalonia.Win32
                             {
                                 ms.Position = DataObject.SerializedObjectGUID.Length;
                                 BinaryFormatter binaryFormatter = new BinaryFormatter();
+#pragma warning disable SYSLIB0011 // Type or member is obsolete
                                 return binaryFormatter.Deserialize(ms);
+#pragma warning restore SYSLIB0011 // Type or member is obsolete
                             }
                         }
                         return data;

src/Windows/Avalonia.Win32/WindowImpl.AppWndProc.cs

@@ -21,6 +21,8 @@ namespace Avalonia.Win32
     {
         [SuppressMessage("Microsoft.StyleCop.CSharp.NamingRules", "SA1305:FieldNamesMustNotUseHungarianNotation",
             Justification = "Using Win32 naming for consistency.")]
+        [UnconditionalSuppressMessage("Trimming", "IL2026", Justification = "We do .NET COM interop availability checks")]
+        [UnconditionalSuppressMessage("Trimming", "IL2050", Justification = "We do .NET COM interop availability checks")]
         protected virtual unsafe IntPtr AppWndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam)
         {
             const double wheelDelta = 120.0;
@@ -83,7 +85,10 @@ namespace Avalonia.Win32
 
                 case WindowsMessage.WM_DESTROY:
                     {
-                        UiaCoreProviderApi.UiaReturnRawElementProvider(_hwnd, IntPtr.Zero, IntPtr.Zero, null);
+                        if (UiaCoreTypesApi.IsNetComInteropAvailable)
+                        {
+                            UiaCoreProviderApi.UiaReturnRawElementProvider(_hwnd, IntPtr.Zero, IntPtr.Zero, null);
+                        }
 
                         // We need to release IMM context and state to avoid leaks.
                         if (Imm32InputMethod.Current.HWND == _hwnd)
@@ -707,7 +712,7 @@ namespace Avalonia.Win32
                     break;
 
                 case WindowsMessage.WM_GETOBJECT:
-                    if ((long)lParam == UiaRootObjectId)
+                    if ((long)lParam == UiaRootObjectId && UiaCoreTypesApi.IsNetComInteropAvailable)
                     {
                         var peer = ControlAutomationPeer.CreatePeerForElement((Control)_owner);
                         var node = AutomationNode.GetOrCreate(peer);