Fixed XAML Designer

Shared/SharedUI/Shared.Ui/Common/LocExtension.cs

@@ -1,4 +1,9 @@
 using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.IO;
+using System.Text.Json;
 using System.Windows;
 using System.Windows.Markup;
 using Microsoft.Extensions.DependencyInjection;
@@ -8,6 +13,10 @@ namespace Shared.Ui.Common
 {
     public class LocExtension : MarkupExtension
     {
+        private static readonly IReadOnlyDictionary<string, string> s_emptyDesignerStrings =
+            new ReadOnlyDictionary<string, string>(new Dictionary<string, string>());
+        private static readonly Lazy<IReadOnlyDictionary<string, string>> s_designerStrings = new(LoadDesignerStrings);
+
         public string Key { get; set; }
 
         public LocExtension(string key)
@@ -17,9 +26,42 @@ public LocExtension(string key)
 
         public override object ProvideValue(IServiceProvider serviceProvider)
         {
-            var applicationServiceProivder = ((IAssetEditorMain)Application.Current).ServiceProvider;
-            var service = applicationServiceProivder.GetRequiredService<LocalizationManager>();
-            return service.Get(Key);
+            if (Application.Current is IAssetEditorMain appMain)
+            {
+                var applicationServiceProivder = appMain.ServiceProvider;
+                var service = applicationServiceProivder.GetRequiredService<LocalizationManager>();
+                return service.Get(Key);
+            }
+
+            if (DesignerProperties.GetIsInDesignMode(new DependencyObject()) &&
+                s_designerStrings.Value.TryGetValue(Key, out var value))
+                return value;
+
+            return Key;
+        }
+
+        private static IReadOnlyDictionary<string, string> LoadDesignerStrings()
+        {
+            try
+            {
+                var currentDirectory = Directory.GetCurrentDirectory();
+                var directPath = Path.Combine(currentDirectory, "Language_En.json");
+                var assetEditorPath = Path.Combine(currentDirectory, "AssetEditor", "Language_En.json");
+                var filePath = File.Exists(directPath) ? directPath : assetEditorPath;
+                if (!File.Exists(filePath))
+                    return s_emptyDesignerStrings;
+
+                var json = File.ReadAllText(filePath);
+                var strings = JsonSerializer.Deserialize<Dictionary<string, string>>(json);
+                if (strings != null)
+                    return new ReadOnlyDictionary<string, string>(strings);
+                else
+                    return s_emptyDesignerStrings;
+            }
+            catch
+            {
+                return s_emptyDesignerStrings;
+            }
         }
     }
 }