add:i18n

Ink Canvas/MainWindow.xaml

@@ -1143,6 +1143,20 @@
                                             <ComboBoxItem Content="{i18n:I18n Key=Theme_System}" FontFamily="Microsoft YaHei UI" />
                                         </ComboBox>
                                     </ui:SimpleStackPanel>
+                                    <ui:SimpleStackPanel Orientation="Horizontal" HorizontalAlignment="Left">
+                                        <TextBlock Foreground="#fafafa" Text="{i18n:I18n Key=Theme_LanguageLabel}" VerticalAlignment="Center"
+                                                   FontSize="14" Margin="0,0,16,0" />
+                                        <ComboBox Name="ComboBoxLanguage" FontFamily="Microsoft YaHei UI"
+                                                  SelectedIndex="0"
+                                                  SelectionChanged="ComboBoxLanguage_SelectionChanged"
+                                                  Width="160">
+                                            <ComboBoxItem Content="{i18n:I18n Key=Theme_Language_System}" FontFamily="Microsoft YaHei UI" />
+                                            <ComboBoxItem Content="{i18n:I18n Key=Theme_Language_ChineseSimplified}" FontFamily="Microsoft YaHei UI" />
+                                            <ComboBoxItem Content="{i18n:I18n Key=Theme_Language_English}" FontFamily="Microsoft YaHei UI" />
+                                        </ComboBox>
+                                    </ui:SimpleStackPanel>
+                                    <TextBlock Text="{i18n:I18n Key=Theme_Language_RestartHint}"
+                                               TextWrapping="Wrap" Foreground="#a1a1aa" />
                                     <ui:SimpleStackPanel Orientation="Horizontal" HorizontalAlignment="Left">
                                         <TextBlock Foreground="#fafafa" Text="{i18n:I18n Key=Theme_EnableSplash}" VerticalAlignment="Center"
                                                    FontSize="14" Margin="0,0,16,0" />

Ink Canvas/MainWindow.xaml.cs

@@ -94,6 +94,19 @@ namespace Ink_Canvas
                 处于画板模式内：Topmost == false / currentMode != 0
                 处于 PPT 放映内：BtnPPTSlideShowEnd.Visibility
             */
+            try
+            {
+                var preferredLanguage = Settings?.Appearance?.Language;
+                if (!string.IsNullOrWhiteSpace(preferredLanguage))
+                {
+                    LocalizationHelper.TrySetCulture(preferredLanguage);
+                }
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"应用首选界面语言失败: {ex.Message}", LogHelper.LogType.Error);
+            }
+
             InitializeComponent();
 
             BlackboardLeftSide.Visibility = Visibility.Collapsed;
@@ -1473,6 +1486,40 @@ namespace Ink_Canvas
             AddTouchSupportToSliders();
         }
 
+        private void ApplyLanguageFromSettings()
+        {
+            try
+            {
+                if (ComboBoxLanguage == null || Settings?.Appearance == null) return;
+
+                var preferredLanguage = Settings.Appearance.Language ?? string.Empty;
+                int index;
+
+                if (string.IsNullOrWhiteSpace(preferredLanguage))
+                {
+                    index = 0;
+                }
+                else if (string.Equals(preferredLanguage, "zh-CN", StringComparison.OrdinalIgnoreCase))
+                {
+                    index = 1;
+                }
+                else if (string.Equals(preferredLanguage, "en-US", StringComparison.OrdinalIgnoreCase))
+                {
+                    index = 2;
+                }
+                else
+                {
+                    index = 0;
+                }
+
+                ComboBoxLanguage.SelectedIndex = index;
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"初始化语言选项失败: {ex.Message}", LogHelper.LogType.Error);
+            }
+        }
+
 
         /// <summary>
         /// 响应显示器/分辨率配置变化：在检测启用时显示分辨率变更通知，并在后台检查悬浮工具栏是否位于屏幕之外，若是则在延迟后尝试将其通过动画恢复到可见区域（在演示模式下使用不同的动画偏移）。 
@@ -4500,6 +4547,43 @@ namespace Ink_Canvas
             }
         }
 
+
+        private void ComboBoxLanguage_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            try
+            {
+                if (!isLoaded) return;
+                if (Settings?.Appearance == null) return;
+                if (ComboBoxLanguage == null) return;
+
+                var index = ComboBoxLanguage.SelectedIndex;
+                string language;
+
+                switch (index)
+                {
+                    case 1:
+                        language = "zh-CN";
+                        break;
+                    case 2:
+                        language = "en-US";
+                        break;
+                    case 0:
+                    default:
+                        language = string.Empty;
+                        break;
+                }
+
+                Settings.Appearance.Language = language;
+                SaveSettingsToFile();
+                ShowNotification("已更新界面语言设置，重启应用后生效。");
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"切换界面语言时出错: {ex.Message}", LogHelper.LogType.Error);
+                ShowNotification("切换界面语言失败。");
+            }
+        }
+
         /// <summary>
         /// 应用指定主题
         /// </summary>

Ink Canvas/Properties/Strings.en-US.resx

@@ -720,4 +720,9 @@
   <data name="Booth_Correction" xml:space="preserve"><value>Correct</value></data>
   <data name="Booth_Capture" xml:space="preserve"><value>Capture</value></data>
   <data name="Booth_Rotate" xml:space="preserve"><value>Rotate</value></data>
+  <data name="Theme_LanguageLabel" xml:space="preserve"><value>UI language</value></data>
+  <data name="Theme_Language_System" xml:space="preserve"><value>Follow system</value></data>
+  <data name="Theme_Language_ChineseSimplified" xml:space="preserve"><value>Chinese (Simplified)</value></data>
+  <data name="Theme_Language_English" xml:space="preserve"><value>English</value></data>
+  <data name="Theme_Language_RestartHint" xml:space="preserve"><value>You need to restart the app for language changes to fully take effect.</value></data>
 </root>

Ink Canvas/Properties/Strings.resx

@@ -735,4 +735,9 @@
   <data name="Booth_Correction" xml:space="preserve"><value>矫正</value></data>
   <data name="Booth_Capture" xml:space="preserve"><value>拍照</value></data>
   <data name="Booth_Rotate" xml:space="preserve"><value>旋转</value></data>
+  <data name="Theme_LanguageLabel" xml:space="preserve"><value>界面语言</value></data>
+  <data name="Theme_Language_System" xml:space="preserve"><value>跟随系统</value></data>
+  <data name="Theme_Language_ChineseSimplified" xml:space="preserve"><value>简体中文</value></data>
+  <data name="Theme_Language_English" xml:space="preserve"><value>English</value></data>
+  <data name="Theme_Language_RestartHint" xml:space="preserve"><value>更改界面语言后需要重启应用程序才能完全生效。</value></data>
 </root>

Ink Canvas/Resources/Settings.cs

@@ -310,6 +310,8 @@ namespace Ink_Canvas
         public int QuickColorPaletteDisplayMode { get; set; } = 1;
         [JsonProperty("enableHotkeysInMouseMode")]
         public bool EnableHotkeysInMouseMode { get; set; } = false;
+        [JsonProperty("language")]
+        public string Language { get; set; } = "";
 
     }