Change the ID of the extension and add notification if 2 extensions are installed

src/OpenSilver.VSIX/OpenSilver.VSIX.csproj

@@ -4,6 +4,7 @@
     <MinimumVisualStudioVersion>16.0</MinimumVisualStudioVersion>
     <OutputPath>bin\OpenSilver\$(Configuration)\</OutputPath>
     <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+    <UseCodebase>true</UseCodebase>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -35,17 +36,18 @@
     <RootNamespace>OpenSilver.VSIX</RootNamespace>
     <AssemblyName>OpenSilver</AssemblyName>
     <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
-    <GeneratePkgDefFile>false</GeneratePkgDefFile>
-    <IncludeAssemblyInVSIXContainer>false</IncludeAssemblyInVSIXContainer>
+    <GeneratePkgDefFile>true</GeneratePkgDefFile>
+    <IncludeAssemblyInVSIXContainer>true</IncludeAssemblyInVSIXContainer>
     <IncludeDebugSymbolsInVSIXContainer>false</IncludeDebugSymbolsInVSIXContainer>
     <IncludeDebugSymbolsInLocalVSIXDeployment>false</IncludeDebugSymbolsInLocalVSIXDeployment>
-    <CopyBuildOutputToOutputDirectory>false</CopyBuildOutputToOutputDirectory>
+    <CopyBuildOutputToOutputDirectory>true</CopyBuildOutputToOutputDirectory>
     <CopyOutputSymbolsToOutputDirectory>false</CopyOutputSymbolsToOutputDirectory>
     <StartAction>Program</StartAction>
     <StartProgram Condition="'$(DevEnvDir)' != ''">$(DevEnvDir)devenv.exe</StartProgram>
     <StartArguments>/rootsuffix Exp</StartArguments>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="OpenSilverPackage.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -234,6 +236,9 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
+    <PackageReference Include="VSSDK.ExtensionManager">
+      <Version>11.0.0</Version>
+    </PackageReference>
   </ItemGroup>
   <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

src/OpenSilver.VSIX/OpenSilverPackage.cs

@@ -0,0 +1,72 @@
+using Microsoft.VisualStudio.Shell.Interop;
+using Microsoft.VisualStudio.Shell;
+using Microsoft.VisualStudio.Threading;
+using Microsoft.VisualStudio.ExtensionManager;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Diagnostics;
+
+namespace OpenSilver.VSIX
+{
+    [PackageRegistration(UseManagedResourcesOnly = true, AllowsBackgroundLoading = true)]
+    [InstalledProductRegistration("OpenSilver SDK", "OpenSilver SDK for Visual Studio", "3.0")]
+    [ProvideAutoLoad(UIContextGuids80.NoSolution, PackageAutoLoadFlags.BackgroundLoad)]
+    public sealed class OpenSilverPackage : AsyncPackage
+    {
+        private const string OldExtensionId = "OpenSilver.64201874-6ead-4828-b5af-31a76285b73d";
+
+        protected override async Task InitializeAsync(CancellationToken cancellationToken, IProgress<ServiceProgressData> progress)
+        {
+            await JoinableTaskFactory.SwitchToMainThreadAsync(cancellationToken);
+
+            DetectOldExtension();
+        }
+
+        private void DetectOldExtension()
+        {
+            ThreadHelper.ThrowIfNotOnUIThread();
+
+            try
+            {
+                IVsExtensionManager extensionManager = (IVsExtensionManager)GetService(typeof(SVsExtensionManager));
+                if (extensionManager != null)
+                {
+                    foreach (var extension in extensionManager.GetInstalledExtensions())
+                    {
+                        if (string.Equals(extension.Header.Identifier, OldExtensionId, StringComparison.OrdinalIgnoreCase))
+                        {
+                            int result = VsShellUtilities.ShowMessageBox(
+                                this,
+                                "An older version of the OpenSilver extension is installed. Please uninstall the old version to avoid conflicts.\n\n" +
+                                "Would you like to open a page with detailed instructions on how to proceed?",
+                                "Extension Conflict Detected",
+                                OLEMSGICON.OLEMSGICON_WARNING,
+                                OLEMSGBUTTON.OLEMSGBUTTON_YESNO,
+                                OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST);
+
+                            if (result == (int)Microsoft.VisualStudio.VSConstants.MessageBoxResult.IDYES)
+                            {
+                                Process.Start(new ProcessStartInfo("https://opensilver.net/uninstall-old-extension")
+                                {
+                                    UseShellExecute = true
+                                });
+                            }
+                            break;
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                VsShellUtilities.ShowMessageBox(
+                    this,
+                    "An error occurred while checking for old extensions: " + ex.Message,
+                    "Error",
+                    OLEMSGICON.OLEMSGICON_CRITICAL,
+                    OLEMSGBUTTON.OLEMSGBUTTON_OK,
+                    OLEMSGDEFBUTTON.OLEMSGDEFBUTTON_FIRST);
+            }
+        }
+    }
+}

src/OpenSilver.VSIX/source.extension.vsixmanifest

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PackageManifest Version="2.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2011" xmlns:d="http://schemas.microsoft.com/developer/vsx-schema-design/2011">
     <Metadata>
-        <Identity Id="OpenSilver.64201874-6ead-4828-b5af-31a76285b73d" Version="3.1.0.6" Language="en-US" Publisher="Userware" />
-        <DisplayName>OpenSilver</DisplayName>
+        <Identity Id="OpenSilverSDK.f8d7e167-8c6f-45d1-823a-5724c26edac8" Version="3.1.0.10" Language="en-US" Publisher="Userware" />
+        <DisplayName>OpenSilver SDK</DisplayName>
         <Description xml:space="preserve">Project templates and XAML Designer for creating OpenSilver applications. OpenSilver is an open-source reimplementation of Silverlight that runs on current browsers via WebAssembly.</Description>
         <Icon>Logo_32x32.png</Icon>
         <PreviewImage>Logo_200x200.png</PreviewImage>
@@ -65,5 +65,6 @@
         <Asset Type="Microsoft.VisualStudio.Assembly" d:Source="File" Path="ItemTemplates\Assemblies\OpenRiaServices.VisualStudio.DomainServices.Tools.14.0.dll" AssemblyName="OpenRiaServices.VisualStudio.DomainServices.Tools.14.0, Version=4.0.0.0, Culture=neutral, PublicKeyToken=2e0b7ccb1ae5b4c8" />
         <Asset Type="Microsoft.VisualStudio.ItemTemplate" d:Source="File" Path="ItemTemplates" d:TargetPath="ItemTemplates\VisualBasic\Web\1033\DomainServiceClass.zip" />
         <Asset Type="Microsoft.VisualStudio.ProjectTemplate" d:Source="Project" d:ProjectName="OpenSilverMauiHybridTemplate" d:TargetPath="|OpenSilverMauiHybridTemplate;TemplateProjectOutputGroup|" Path="ProjectTemplates" d:VsixSubPath="ProjectTemplates" />
+        <Asset Type="Microsoft.VisualStudio.VsPackage" d:Source="Project" d:ProjectName="%CurrentProject%" Path="|%CurrentProject%;PkgdefProjectOutputGroup|" />
     </Assets>
 </PackageManifest>