Stop binding assembly versions at all, and add version info

Vsix/CodeConversion.cs

@@ -25,7 +25,6 @@ internal class CodeConversion
         private readonly IAsyncServiceProvider _serviceProvider;
         private readonly JoinableTaskFactory _joinableTaskFactory;
         private readonly VisualStudioWorkspace _visualStudioWorkspace;
-        public static readonly string ConverterTitle = "Code converter";
         private static readonly string Intro = Environment.NewLine + Environment.NewLine + new string(Enumerable.Repeat('-', 80).ToArray()) + Environment.NewLine;
         private readonly OutputWindow _outputWindow;
         private readonly Cancellation _packageCancellation;

Vsix/CodeConverterPackage.cs

@@ -84,58 +84,17 @@ public sealed class CodeConverterPackage : AsyncPackage
 
         internal Cancellation PackageCancellation { get; } = new Cancellation();
 
-        private readonly AssemblyName _thisAssemblyName;
-        private readonly HashSet<string> _ourAssemblyNames;
         /// <summary>
         /// Initializes a new instance of package class.
         /// </summary>
         public CodeConverterPackage()
         {
-            var thisAssembly = GetType().Assembly;
-            _thisAssemblyName = thisAssembly.GetName();
-            _ourAssemblyNames = new HashSet<string>(new[] { _thisAssemblyName }.Concat(thisAssembly.GetReferencedAssemblies().Where(a => a.Name.StartsWith("ICSharpCode"))).Select(a => a.FullName));
             // Inside this method you can place any initialization code that does not require
             // any Visual Studio service because at this point the package object is created but
             // not sited yet inside Visual Studio environment. The place to do all the other
             // initialization is the Initialize method.
         }
 
-        // System.Threading.Tasks.Dataflow 4.5.24.0 shipped with VS2017 15.9.21+28307.1064 but we want to target 4.6.0.0
-        private Assembly LoadWithoutVersionForOurDependencies(object sender, ResolveEventArgs args)
-        {
-            var requestedAssemblyName = new AssemblyName(args.Name);
-            if (requestedAssemblyName.Version != null && IsThisExtensionRequestingAssembly()) {
-                return LoadAnyVersionOfAssembly(requestedAssemblyName);
-            }
-            return null;
-
-        }
-
-        private static Assembly LoadAnyVersionOfAssembly(AssemblyName assemblyName)
-        {
-            try {
-                return Assembly.Load(new AssemblyName(assemblyName.Name){CultureName = assemblyName.CultureName});
-            } catch (FileNotFoundException e) when (e.FileName.Contains("Microsoft.VisualStudio.LanguageServices") && ProbablyRequiresVsUpgrade) {
-                MessageBox.Show(
-                    "Code Converter cannot find `Microsoft.VisualStudio.LanguageServices`. Please upgrade Visual Studio to version 15.9.3 or above.\r\n\r\n" +
-                    "If after upgrading you still see this error, attach your activity log %AppData%\\Microsoft\\VisualStudio\\<version>\\ActivityLog.xml to a GitHub issue at https://github.com/icsharpcode/CodeConverter \r\n\r\n" +
-                    "You can press Ctrl + C to copy this message",
-                    "Upgrade Visual Studio", MessageBoxButton.OK);
-                return null;
-            }
-        }
-
-        private bool IsThisExtensionRequestingAssembly()
-        {
-            return GetPossibleRequestingAssemblies().Any(requesting => _ourAssemblyNames.Contains(requesting.FullName));
-        }
-
-        private IEnumerable<AssemblyName> GetPossibleRequestingAssemblies()
-        {
-            return new StackTrace().GetFrames().Select(f => f.GetMethod().DeclaringType?.Assembly)
-                .Select(a => a.GetName()).SkipWhile(a => Equals(a, _thisAssemblyName));
-        }
-
         /// <summary>
         /// Initialization of the package; this method is called right after the package is sited, so this is the place
         /// where you can put all the initialization code that rely on services provided by VisualStudio.
@@ -155,25 +114,6 @@ protected override async Task InitializeAsync(CancellationToken cancellationToke
             await base.InitializeAsync(cancellationToken, progress);
         }
 
-        public static bool ProbablyRequiresVsUpgrade {
-            get {
-                var version = FullVsVersion;
-                return version == null || version < new Version(15, 9, 3, 0);
-            }
-        }
-
-        private static Version FullVsVersion {
-            get {
-                string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "msenv.dll");
-
-                if (File.Exists(path)) {
-                    var fvi = FileVersionInfo.GetVersionInfo(path);
-                    return new Version(fvi.ProductMajorPart, fvi.ProductMinorPart, fvi.ProductBuildPart,
-                        fvi.ProductPrivatePart);
-                } else return null;
-            }
-        }
-
         internal OleMenuCommandWithBlockingStatus CreateCommand(Func<CancellationToken, Task> callbackAsync, CommandID menuCommandId)
         {
             return new OleMenuCommandWithBlockingStatus(JoinableTaskFactory, PackageCancellation, callbackAsync, menuCommandId);

Vsix/ConvertCSToVBCommand.cs

@@ -167,7 +167,7 @@ private async Task SolutionOrProjectMenuItemCallbackAsync(CancellationToken canc
                 var projects = VisualStudioInteraction.GetSelectedProjectsAsync(ProjectExtension);
                 await _codeConversion.ConvertProjectsAsync<CSToVBConversion>(await projects, cancellationToken);
             } catch (Exception ex) {
-                await VisualStudioInteraction.ShowExceptionAsync(ServiceProvider, CodeConversion.ConverterTitle, ex);
+                await VisualStudioInteraction.ShowExceptionAsync(ex);
             }
         }
 
@@ -179,7 +179,7 @@ private async Task ConvertDocumentAsync(string documentPath, Span selected, Canc
             try {
                 await _codeConversion.ConvertDocumentAsync<CSToVBConversion>(documentPath, selected, cancellationToken);
             } catch (Exception ex) {
-                await VisualStudioInteraction.ShowExceptionAsync(ServiceProvider, CodeConversion.ConverterTitle, ex);
+                await VisualStudioInteraction.ShowExceptionAsync(ex);
             }
         }
     }

Vsix/ConvertVBToCSCommand.cs

@@ -167,7 +167,7 @@ private async Task SolutionOrProjectMenuItemCallbackAsync(CancellationToken canc
                 var projects = VisualStudioInteraction.GetSelectedProjectsAsync(ProjectExtension);
                 await _codeConversion.ConvertProjectsAsync<VBToCSConversion>(await projects, cancellationToken);
             } catch (Exception ex) {
-                await VisualStudioInteraction.ShowExceptionAsync(ServiceProvider, CodeConversion.ConverterTitle, ex);
+                await VisualStudioInteraction.ShowExceptionAsync(ex);
             }
         }
 
@@ -179,7 +179,7 @@ private async Task ConvertDocumentAsync(string documentPath, Span selected, Canc
             try {
                 await _codeConversion.ConvertDocumentAsync<VBToCSConversion>(documentPath, selected, cancellationToken);
             } catch (Exception ex) {
-                await VisualStudioInteraction.ShowExceptionAsync(ServiceProvider, CodeConversion.ConverterTitle, ex);
+                await VisualStudioInteraction.ShowExceptionAsync(ex);
             }
         }
     }

Vsix/VisualStudioInteraction.cs

@@ -1,13 +1,16 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows;
 using EnvDTE;
 using EnvDTE80;
+using ICSharpCode.CodeConverter.Shared;
 using Microsoft.VisualStudio;
 using Microsoft.VisualStudio.Editor;
 using Microsoft.VisualStudio.Shell;
@@ -35,6 +38,24 @@ internal static class VisualStudioInteraction
         internal static DTE2 Dte => m_Dte ?? (m_Dte = Package.GetGlobalService(typeof(DTE)) as DTE2);
 
         private static CancellationToken CancelAllToken;
+        private static readonly Version m_LowestSupportedVersion = new Version(15, 7, 0, 0);
+        private static readonly Version m_FullVsVersion = GetFullVsVersion();
+        private static readonly string m_Title = "Code converter " + new AssemblyName(typeof(CodeConversion).Assembly.FullName).Version.ToString(3) + " - Visual Studio " + m_FullVsVersion;
+
+        private static Version GetFullVsVersion()
+        {
+            string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "msenv.dll");
+
+            if (File.Exists(path)) {
+                var fvi = FileVersionInfo.GetVersionInfo(path);
+                return new Version(fvi.ProductMajorPart, fvi.ProductMinorPart, fvi.ProductBuildPart,
+                    fvi.ProductPrivatePart);
+            } else {
+                return null;
+            }
+        }
+
+
         internal static void Initialize(Cancellation packageCancellation)
         {
             CancelAllToken = packageCancellation.CancelAll;
@@ -86,12 +107,19 @@ public static async Task<ITextDocument> GetTextDocumentAsync(this IWpfTextViewHo
             return textDocument;
         }
 
-        public static async Task ShowExceptionAsync(IAsyncServiceProvider serviceProvider, string title, Exception ex)
+        public static async Task ShowExceptionAsync(Exception ex)
         {
             await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync(CancelAllToken);
             if (!CancelAllToken.IsCancellationRequested) {
-                MessageBox.Show($"An error has occured during conversion - press Ctrl+C to copy the details: {ex}",
-                    title, MessageBoxButton.OK, MessageBoxImage.Error);
+                var versionMessageSuffix = "";
+                if (m_FullVsVersion < m_LowestSupportedVersion) {
+                    versionMessageSuffix = $"{Environment.NewLine}This extension only supports VS {m_LowestSupportedVersion}+, you are currently using {m_FullVsVersion}";
+                }
+                if (m_FullVsVersion.Major < 16) {
+                    versionMessageSuffix = $"{Environment.NewLine}Support for VS2017 (15.*) is likely to end this year. You're using: {m_FullVsVersion}";
+                }
+                MessageBox.Show($"An error has occured during conversion - press Ctrl+C to copy the details: {ex}{versionMessageSuffix}",
+                    m_Title, MessageBoxButton.OK, MessageBoxImage.Error);
             }
         }