[AOT] Remove rd.xml from CmdPal (#41031)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
Actually, we don't need to use rd.xml to preserve type. We can add
attribute to do the same things.

Tested in this build:
https://microsoft.visualstudio.com/Dart/_build/results?buildId=127875892&view=artifacts&pathAsName=false&type=publishedArtifacts

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## PR Checklist

- [x] Closes: #40633
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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---------

Co-authored-by: Yu Leng (from Dev Box) <yuleng@microsoft.com>

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/CommandContextItemViewModel.cs

@@ -2,11 +2,14 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.CmdPal.Core.ViewModels.Models;
 using Microsoft.CommandPalette.Extensions;
+using Microsoft.CommandPalette.Extensions.Toolkit;
 
 namespace Microsoft.CmdPal.Core.ViewModels;
 
+[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
 public partial class CommandContextItemViewModel(ICommandContextItem contextItem, WeakReference<IPageContext> context) : CommandItemViewModel(new(contextItem), context), IContextItemViewModel
 {
     private readonly KeyChord nullKeyChord = new(0, 0, 0);

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/CommandItemViewModel.cs

@@ -2,6 +2,7 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.CmdPal.Core.ViewModels.Messages;
 using Microsoft.CmdPal.Core.ViewModels.Models;
 using Microsoft.CommandPalette.Extensions;
@@ -9,6 +10,7 @@ using Microsoft.CommandPalette.Extensions.Toolkit;
 
 namespace Microsoft.CmdPal.Core.ViewModels;
 
+[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
 public partial class CommandItemViewModel : ExtensionObjectViewModel, ICommandBarContext
 {
     public ExtensionObject<ICommandItem> Model => _commandItemModel;

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/IContextItemViewModel.cs

@@ -4,12 +4,14 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
 namespace Microsoft.CmdPal.Core.ViewModels;
 
+[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
 public interface IContextItemViewModel
 {
 }

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/SeparatorContextItemViewModel.cs

@@ -2,11 +2,13 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.CmdPal.Core.ViewModels;
 using Microsoft.CommandPalette.Extensions;
 
 namespace Microsoft.CmdPal.Core.ViewModels;
 
+[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
 public partial class SeparatorContextItemViewModel() : IContextItemViewModel, ISeparatorContextItem
 {
 }

src/modules/cmdpal/Microsoft.CmdPal.UI/App.xaml.cs

@@ -64,6 +64,9 @@ public partial class App : Application
 
         this.InitializeComponent();
 
+        // Ensure types used in XAML are preserved for AOT compilation
+        TypePreservation.PreserveTypes();
+
         NativeEventWaiter.WaitForEventLoop(
             "Local\\PowerToysCmdPal-ExitEvent-eb73f6be-3f22-4b36-aee3-62924ba40bfd", () =>
             {

src/modules/cmdpal/Microsoft.CmdPal.UI/Converters/ContextItemTemplateSelector.cs

@@ -2,6 +2,7 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.CmdPal.Core.ViewModels;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
@@ -10,6 +11,7 @@ using Microsoft.UI.Xaml.Data;
 
 namespace Microsoft.CmdPal.UI;
 
+[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)]
 internal sealed partial class ContextItemTemplateSelector : DataTemplateSelector
 {
     public DataTemplate? Default { get; set; }

src/modules/cmdpal/Microsoft.CmdPal.UI/Microsoft.CmdPal.UI.csproj

@@ -109,10 +109,6 @@
     <ProjectCapability Include="Msix" />
   </ItemGroup>
 
-  <ItemGroup>
-	<RdXmlFile Include="rd.xml" />
-  </ItemGroup>
-
   <ItemGroup>
     <ProjectReference Include="..\..\..\common\ManagedTelemetry\Telemetry\ManagedTelemetry.csproj" />
     <ProjectReference Include="..\ext\Microsoft.CmdPal.Ext.ClipboardHistory\Microsoft.CmdPal.Ext.ClipboardHistory.csproj" />

src/modules/cmdpal/Microsoft.CmdPal.UI/TypePreservation.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Diagnostics.CodeAnalysis;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Microsoft.CmdPal.UI;
+
+/// <summary>
+/// This class ensures types used in XAML are preserved during AOT compilation.
+/// Framework types cannot have attributes added directly to their definitions since they're external types.
+/// Application types that require runtime type checking should also be preserved here if needed.
+/// </summary>
+internal static class TypePreservation
+{
+    /// <summary>
+    /// This method ensures critical types are preserved for AOT compilation.
+    /// These types are used dynamically in XAML and would otherwise be trimmed.
+    /// </summary>
+    [DynamicDependency(DynamicallyAccessedMemberTypes.All, typeof(Microsoft.UI.Xaml.Controls.FontIconSource))]
+    [DynamicDependency(DynamicallyAccessedMemberTypes.All, typeof(Microsoft.UI.Xaml.Controls.PathIcon))]
+    [DynamicDependency(DynamicallyAccessedMemberTypes.All, typeof(Microsoft.UI.Xaml.DataTemplate))]
+    [DynamicDependency(DynamicallyAccessedMemberTypes.All, typeof(Microsoft.UI.Xaml.Controls.DataTemplateSelector))]
+    [DynamicDependency(DynamicallyAccessedMemberTypes.All, typeof(Microsoft.UI.Xaml.Controls.ListViewItem))]
+    public static void PreserveTypes()
+    {
+        // This method exists only to hold the DynamicDependency attributes above.
+        // It must be called to ensure the types are not trimmed during AOT compilation.
+
+        // Note: We cannot add [DynamicallyAccessedMembers] directly to framework types
+        // since we don't own their source code. DynamicDependency is the correct approach
+        // for preserving external types that are used dynamically (e.g., in XAML).
+
+        // For application types that require runtime type checking (e.g., in template selectors),
+        // prefer adding [DynamicallyAccessedMembers] attributes directly on the type definitions.
+        // Only use DynamicDependency here for types we cannot modify directly.
+    }
+}

src/modules/cmdpal/Microsoft.CmdPal.UI/rd.xml

@@ -1,23 +0,0 @@
-<Directives xmlns="http://schemas.microsoft.com/netfx/2013/01/metadata">
-	<Application>
-		<Assembly Name="Microsoft.WinUI">
-			<Type Name="Microsoft.UI.Xaml.Controls.FontIconSource" Dynamic="Required All" />
-			<Type Name="Microsoft.UI.Xaml.DataTemplate" Dynamic="Required All" />
-			<Type Name="Microsoft.UI.Xaml.Controls.DataTemplateSelector" Dynamic="Required All" />
-			<Type Name="Microsoft.UI.Xaml.Controls.ListViewItem" Dynamic="Required All" />
-		</Assembly>
-
-		<!-- Add ViewModel types for AOT compatibility -->
-		<Assembly Name="Microsoft.CmdPal.Core.ViewModels">
-			<Type Name="Microsoft.CmdPal.Core.ViewModels.CommandContextItemViewModel" Dynamic="Required All" />
-			<Type Name="Microsoft.CmdPal.Core.ViewModels.SeparatorContextItemViewModel" Dynamic="Required All" />
-			<Type Name="Microsoft.CmdPal.Core.ViewModels.IContextItemViewModel" Dynamic="Required All" />
-			<Type Name="Microsoft.CmdPal.Core.ViewModels.CommandItemViewModel" Dynamic="Required All" />
-		</Assembly>
-
-		<!-- Add UI types for AOT compatibility -->
-		<Assembly Name="Microsoft.CmdPal.UI">
-			<Type Name="Microsoft.CmdPal.UI.ContextItemTemplateSelector" Dynamic="Required All" />
-		</Assembly>
-	</Application>
-</Directives>