Add 'Check Only' update action

Introduce a new "Check Only" feature: add CheckOnlyCmd to CheckUpdateViewModel with CheckOnlyTask that queries updates (via UpdateService.CheckHasUpdateOnly) for selected cores and reports results without performing updates. Wire up a new btnCheckOnly in both Desktop and Avalonia views and bind the command. Add localized menuCheckOnly entries to multiple .resx files and update ResUI.Designer. Also shorten the pre-release label to "Check for pre-release" in resource files.

v2rayN/ServiceLib/Resx/ResUI.Designer.cs

@@ -870,6 +870,15 @@ namespace ServiceLib.Resx {
             }
         }
         
+        /// <summary>
+        ///   查找类似 Only Check 的本地化字符串。
+        /// </summary>
+        public static string menuCheckOnly {
+            get {
+                return ResourceManager.GetString("menuCheckOnly", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   查找类似 Check Update 的本地化字符串。
         /// </summary>
@@ -3934,7 +3943,7 @@ namespace ServiceLib.Resx {
         }
         
         /// <summary>
-        ///   查找类似 Check for pre-release updates 的本地化字符串。
+        ///   查找类似 Check for pre-release 的本地化字符串。
         /// </summary>
         public static string TbSettingsEnableCheckPreReleaseUpdate {
             get {

v2rayN/ServiceLib/Resx/ResUI.fa-Ir.resx

@@ -1734,4 +1734,7 @@ The "Get Certificate" action may fail if a self-signed certificate is used or if
   <data name="MsgCheckUpdateHasNewVersion" xml:space="preserve">
     <value>{0} has a new version available: {1}</value>
   </data>
+  <data name="menuCheckOnly" xml:space="preserve">
+    <value>Only Check</value>
+  </data>
 </root>

v2rayN/ServiceLib/Resx/ResUI.fr.resx

@@ -1731,4 +1731,7 @@ The "Get Certificate" action may fail if a self-signed certificate is used or if
   <data name="MsgCheckUpdateHasNewVersion" xml:space="preserve">
     <value>{0} has a new version available: {1}</value>
   </data>
+  <data name="menuCheckOnly" xml:space="preserve">
+    <value>Only Check</value>
+  </data>
 </root>

v2rayN/ServiceLib/Resx/ResUI.hu.resx

@@ -1734,4 +1734,7 @@ The "Get Certificate" action may fail if a self-signed certificate is used or if
   <data name="MsgCheckUpdateHasNewVersion" xml:space="preserve">
     <value>{0} has a new version available: {1}</value>
   </data>
+  <data name="menuCheckOnly" xml:space="preserve">
+    <value>Only Check</value>
+  </data>
 </root>

v2rayN/ServiceLib/Resx/ResUI.resx

@@ -691,7 +691,7 @@
     <value>Automatically adjust column width after subscription update</value>
   </data>
   <data name="TbSettingsEnableCheckPreReleaseUpdate" xml:space="preserve">
-    <value>Check for pre-release updates</value>
+    <value>Check for pre-release</value>
   </data>
   <data name="TbSettingsException" xml:space="preserve">
     <value>Exception</value>
@@ -1734,4 +1734,7 @@ The "Get Certificate" action may fail if a self-signed certificate is used or if
   <data name="MsgCheckUpdateHasNewVersion" xml:space="preserve">
     <value>{0} has a new version available: {1}</value>
   </data>
+  <data name="menuCheckOnly" xml:space="preserve">
+    <value>Only Check</value>
+  </data>
 </root>

v2rayN/ServiceLib/Resx/ResUI.ru.resx

@@ -1734,4 +1734,7 @@
   <data name="MsgCheckUpdateHasNewVersion" xml:space="preserve">
     <value>{0} has a new version available: {1}</value>
   </data>
+  <data name="menuCheckOnly" xml:space="preserve">
+    <value>Only Check</value>
+  </data>
 </root>

v2rayN/ServiceLib/Resx/ResUI.zh-Hans.resx

@@ -691,7 +691,7 @@
     <value>自动调整配置列宽在更新订阅后</value>
   </data>
   <data name="TbSettingsEnableCheckPreReleaseUpdate" xml:space="preserve">
-    <value>检查 Pre-Release 更新 (请谨慎启用)</value>
+    <value>检查 Pre-Release</value>
   </data>
   <data name="TbSettingsException" xml:space="preserve">
     <value>例外</value>
@@ -1731,4 +1731,7 @@
   <data name="MsgCheckUpdateHasNewVersion" xml:space="preserve">
     <value>{0} 有新版本可用：{1}</value>
   </data>
+  <data name="menuCheckOnly" xml:space="preserve">
+    <value>仅检查</value>
+  </data>
 </root>

v2rayN/ServiceLib/Resx/ResUI.zh-Hant.resx

@@ -691,7 +691,7 @@
     <value>在更新訂閱後自動調整列寬</value>
   </data>
   <data name="TbSettingsEnableCheckPreReleaseUpdate" xml:space="preserve">
-    <value>檢查 Pre-Release 更新 (請謹慎啟用)</value>
+    <value>檢查 Pre-Release</value>
   </data>
   <data name="TbSettingsException" xml:space="preserve">
     <value>例外</value>
@@ -1731,4 +1731,7 @@
   <data name="MsgCheckUpdateHasNewVersion" xml:space="preserve">
     <value>{0} 有新版本可用：{1}</value>
   </data>
+  <data name="menuCheckOnly" xml:space="preserve">
+    <value>僅檢查</value>
+  </data>
 </root>

v2rayN/ServiceLib/ViewModels/CheckUpdateViewModel.cs

@@ -9,6 +9,7 @@ public class CheckUpdateViewModel : MyReactiveObject
 
     public IObservableCollection<CheckUpdateModel> CheckUpdateModels { get; } = new ObservableCollectionExtended<CheckUpdateModel>();
     public ReactiveCommand<Unit, Unit> CheckUpdateCmd { get; }
+    public ReactiveCommand<Unit, Unit> CheckOnlyCmd { get; }
     [Reactive] public bool EnableCheckPreReleaseUpdate { get; set; }
 
     public CheckUpdateViewModel(Func<EViewAction, object?, Task<bool>>? updateView)
@@ -23,6 +24,13 @@ public class CheckUpdateViewModel : MyReactiveObject
             _ = UpdateView(_v2rayN, ex.Message);
         });
 
+        CheckOnlyCmd = ReactiveCommand.CreateFromTask(CheckOnly);
+        CheckOnlyCmd.ThrownExceptions.Subscribe(ex =>
+        {
+            Logging.SaveLog(_tag, ex);
+            _ = UpdateView(_v2rayN, ex.Message);
+        });
+
         EnableCheckPreReleaseUpdate = _config.CheckUpdateItem.CheckPreReleaseUpdate;
 
         this.WhenAnyValue(
@@ -71,11 +79,54 @@ public class CheckUpdateViewModel : MyReactiveObject
         await ConfigHandler.SaveConfig(_config);
     }
 
+    private async Task CheckOnly()
+    {
+        await Task.Run(CheckOnlyTask);
+    }
+
     private async Task CheckUpdate()
     {
         await Task.Run(CheckUpdateTask);
     }
 
+    private async Task CheckOnlyTask()
+    {
+        await SaveSelectedCoreTypes();
+
+        for (var k = CheckUpdateModels.Count - 1; k >= 0; k--)
+        {
+            var item = CheckUpdateModels[k];
+            if (item.IsSelected != true)
+            {
+                continue;
+            }
+
+            await UpdateView(item.CoreType, "...");
+            if (item.CoreType == _geo)
+            {
+                await UpdateView(item.CoreType, ResUI.menuCheckOnly + " (Not Support)");
+                continue;
+            }
+
+            if (!Enum.TryParse<ECoreType>(item.CoreType, out var type))
+            {
+                await UpdateView(item.CoreType, "Not Support");
+                continue;
+            }
+
+            var updateService = new UpdateService(_config, async (success, msg) => await Task.CompletedTask);
+            var result = await updateService.CheckHasUpdateOnly(type, EnableCheckPreReleaseUpdate);
+            if (result.Success && result.Version != null)
+            {
+                await UpdateView(item.CoreType, string.Format(ResUI.MsgCheckUpdateHasNewVersion, type, result.Version));
+            }
+            else
+            {
+                await UpdateView(item.CoreType, result.Msg);
+            }
+        }
+    }
+
     private async Task CheckUpdateTask()
     {
         _lstUpdated.Clear();

v2rayN/v2rayN.Desktop/Views/CheckUpdateView.axaml

@@ -33,6 +33,12 @@
                     Margin="{StaticResource Margin4}"
                     HorizontalAlignment="Left" />
 
+                <Button
+                    x:Name="btnCheckOnly"
+                    Width="100"
+                    Margin="{StaticResource Margin4}"
+                    Content="{x:Static resx:ResUI.menuCheckOnly}" />
+
                 <Button
                     x:Name="btnCheckUpdate"
                     Width="100"

v2rayN/v2rayN.Desktop/Views/CheckUpdateView.axaml.cs

@@ -13,6 +13,7 @@ public partial class CheckUpdateView : ReactiveUserControl<CheckUpdateViewModel>
             this.OneWayBind(ViewModel, vm => vm.CheckUpdateModels, v => v.lstCheckUpdates.ItemsSource).DisposeWith(disposables);
 
             this.Bind(ViewModel, vm => vm.EnableCheckPreReleaseUpdate, v => v.togEnableCheckPreReleaseUpdate.IsChecked).DisposeWith(disposables);
+            this.BindCommand(ViewModel, vm => vm.CheckOnlyCmd, v => v.btnCheckOnly).DisposeWith(disposables);
             this.BindCommand(ViewModel, vm => vm.CheckUpdateCmd, v => v.btnCheckUpdate).DisposeWith(disposables);
         });
     }

v2rayN/v2rayN/Views/CheckUpdateView.xaml

@@ -32,6 +32,13 @@
                 Margin="{StaticResource Margin8}"
                 HorizontalAlignment="Left" />
 
+            <Button
+                x:Name="btnCheckOnly"
+                Width="100"
+                Margin="{StaticResource Margin8}"
+                Content="{x:Static resx:ResUI.menuCheckOnly}"
+                Style="{StaticResource DefButton}" />
+
             <Button
                 x:Name="btnCheckUpdate"
                 Width="100"

v2rayN/v2rayN/Views/CheckUpdateView.xaml.cs

@@ -13,6 +13,7 @@ public partial class CheckUpdateView
             this.OneWayBind(ViewModel, vm => vm.CheckUpdateModels, v => v.lstCheckUpdates.ItemsSource).DisposeWith(disposables);
 
             this.Bind(ViewModel, vm => vm.EnableCheckPreReleaseUpdate, v => v.togEnableCheckPreReleaseUpdate.IsChecked).DisposeWith(disposables);
+            this.BindCommand(ViewModel, vm => vm.CheckOnlyCmd, v => v.btnCheckOnly).DisposeWith(disposables);
             this.BindCommand(ViewModel, vm => vm.CheckUpdateCmd, v => v.btnCheckUpdate).DisposeWith(disposables);
         });
     }