Main app aot compatibility.

Wino.Mail.WinUI/Selectors/AccountProviderViewModelTemplateSelector.cs

@@ -1,4 +1,5 @@
-using Microsoft.UI.Xaml;
+using System;
+using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using Wino.Core.ViewModels.Data;
 
@@ -6,14 +7,14 @@ namespace Wino.Selectors;
 
 public partial class AccountProviderViewModelTemplateSelector : DataTemplateSelector
 {
-    public DataTemplate RootAccountTemplate { get; set; }
-    public DataTemplate MergedAccountTemplate { get; set; }
+    public DataTemplate? RootAccountTemplate { get; set; }
+    public DataTemplate? MergedAccountTemplate { get; set; }
 
     protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
     {
         if (item is MergedAccountProviderDetailViewModel)
-            return MergedAccountTemplate;
+            return MergedAccountTemplate ?? throw new ArgumentException(nameof(MergedAccountTemplate));
         else
-            return RootAccountTemplate;
+            return RootAccountTemplate ?? throw new ArgumentException(nameof(RootAccountTemplate));
     }
 }