diff --git a/ICSharpCode.Decompiler/CSharp/ProjectDecompiler/TargetServices.cs b/ICSharpCode.Decompiler/CSharp/ProjectDecompiler/TargetServices.cs
index 61b3ad39d..48675a2f1 100644
--- a/ICSharpCode.Decompiler/CSharp/ProjectDecompiler/TargetServices.cs
+++ b/ICSharpCode.Decompiler/CSharp/ProjectDecompiler/TargetServices.cs
@@ -76,11 +76,11 @@ namespace ICSharpCode.Decompiler.CSharp.ProjectDecompiler
 				targetFrameworkIdentifier = frameworkParts.FirstOrDefault(a => !a.StartsWith(VersionToken, StringComparison.OrdinalIgnoreCase) && !a.StartsWith(ProfileToken, StringComparison.OrdinalIgnoreCase));
 				string frameworkVersion = frameworkParts.FirstOrDefault(a => a.StartsWith(VersionToken, StringComparison.OrdinalIgnoreCase));
 
-				if (frameworkVersion != null)
+				if (frameworkVersion != null && Version.TryParse(frameworkVersion.Substring(VersionToken.Length).Replace("v", ""), out var version))
 				{
-					versionNumber = int.Parse(frameworkVersion.Substring(VersionToken.Length).Replace("v", "").Replace(".", ""));
-					if (versionNumber < 100)
-						versionNumber *= 10;
+					versionNumber = version.Major * 100 + version.Minor * 10;
+					if (version.Build > 0)
+						versionNumber += version.Build;
 				}
 
 				string frameworkProfile = frameworkParts.FirstOrDefault(a => a.StartsWith(ProfileToken, StringComparison.OrdinalIgnoreCase));
diff --git a/ICSharpCode.Decompiler/Solution/SolutionCreator.cs b/ICSharpCode.Decompiler/Solution/SolutionCreator.cs
index 1619ea8f1..2b11a712f 100644
--- a/ICSharpCode.Decompiler/Solution/SolutionCreator.cs
+++ b/ICSharpCode.Decompiler/Solution/SolutionCreator.cs
@@ -29,10 +29,11 @@ namespace ICSharpCode.Decompiler.Solution
 	/// </summary>
 	public static class SolutionCreator
 	{
-		private static readonly XNamespace ProjectFileNamespace = XNamespace.Get("http://schemas.microsoft.com/developer/msbuild/2003");
+		static readonly XNamespace NonSDKProjectFileNamespace = XNamespace.Get("http://schemas.microsoft.com/developer/msbuild/2003");
 
 		/// <summary>
 		/// Writes a solution file to the specified <paramref name="targetFile"/>.
+		/// Also fixes intra-solution project references in the project files.
 		/// </summary>
 		/// <param name="targetFile">The full path of the file to write.</param>
 		/// <param name="projects">The projects contained in this solution.</param>
@@ -40,7 +41,7 @@ namespace ICSharpCode.Decompiler.Solution
 		/// <exception cref="ArgumentException">Thrown when <paramref name="targetFile"/> is null or empty.</exception>
 		/// <exception cref="ArgumentNullException">Thrown when <paramref name="projects"/> is null.</exception>
 		/// <exception cref="InvalidOperationException">Thrown when <paramref name="projects"/> contains no items.</exception>
-		public static void WriteSolutionFile(string targetFile, IEnumerable<ProjectItem> projects)
+		public static void WriteSolutionFile(string targetFile, List<ProjectItem> projects)
 		{
 			if (string.IsNullOrWhiteSpace(targetFile))
 			{
@@ -62,10 +63,10 @@ namespace ICSharpCode.Decompiler.Solution
 				WriteSolutionFile(writer, projects, targetFile);
 			}
 
-			FixProjectReferences(projects);
+			FixAllProjectReferences(projects);
 		}
 
-		private static void WriteSolutionFile(TextWriter writer, IEnumerable<ProjectItem> projects, string solutionFilePath)
+		static void WriteSolutionFile(TextWriter writer, List<ProjectItem> projects, string solutionFilePath)
 		{
 			WriteHeader(writer);
 			WriteProjects(writer, projects, solutionFilePath);
@@ -90,7 +91,7 @@ namespace ICSharpCode.Decompiler.Solution
 			writer.WriteLine("MinimumVisualStudioVersion = 10.0.40219.1");
 		}
 
-		private static void WriteProjects(TextWriter writer, IEnumerable<ProjectItem> projects, string solutionFilePath)
+		static void WriteProjects(TextWriter writer, List<ProjectItem> projects, string solutionFilePath)
 		{
 			foreach (var project in projects)
 			{
@@ -103,7 +104,7 @@ namespace ICSharpCode.Decompiler.Solution
 			}
 		}
 
-		private static IEnumerable<string> WriteSolutionConfigurations(TextWriter writer, IEnumerable<ProjectItem> projects)
+		static List<string> WriteSolutionConfigurations(TextWriter writer, List<ProjectItem> projects)
 		{
 			var platforms = projects.GroupBy(p => p.PlatformName).Select(g => g.Key).ToList();
 
@@ -125,10 +126,10 @@ namespace ICSharpCode.Decompiler.Solution
 			return platforms;
 		}
 
-		private static void WriteProjectConfigurations(
+		static void WriteProjectConfigurations(
 			TextWriter writer,
-			IEnumerable<ProjectItem> projects,
-			IEnumerable<string> solutionPlatforms)
+			List<ProjectItem> projects,
+			List<string> solutionPlatforms)
 		{
 			writer.WriteLine("\tGlobalSection(ProjectConfigurationPlatforms) = postSolution");
 
@@ -152,47 +153,80 @@ namespace ICSharpCode.Decompiler.Solution
 			writer.WriteLine("\tEndGlobalSection");
 		}
 
-		private static void FixProjectReferences(IEnumerable<ProjectItem> projects)
+		static void FixAllProjectReferences(List<ProjectItem> projects)
 		{
-			var projectsMap = projects.ToDictionary(p => p.ProjectName, p => p);
+			var projectsMap = projects.ToDictionary(
+				p => p.ProjectName,
+				p => p);
 
 			foreach (var project in projects)
 			{
 				XDocument projectDoc = XDocument.Load(project.FilePath);
 
+				if (projectDoc.Root?.Name.LocalName != "Project")
+				{
+					throw new InvalidOperationException(
+						$"The file {project.FilePath} is not a valid project file, " +
+						$"no <Project> at the root; could not fix project references.");
+				}
+
+				// sdk style projects don't use a namespace for the elements,
+				// but we still need to use the namespace for non-sdk style projects.
+				var sdkStyle = projectDoc.Root.Attribute("Sdk") != null;
+				var itemGroupTagName = sdkStyle ? "ItemGroup" : NonSDKProjectFileNamespace + "ItemGroup";
+				var referenceTagName = sdkStyle ? "Reference" : NonSDKProjectFileNamespace + "Reference";
+
 				var referencesItemGroups = projectDoc.Root
-					.Elements(ProjectFileNamespace + "ItemGroup")
-					.Where(e => e.Elements(ProjectFileNamespace + "Reference").Any());
+					.Elements(itemGroupTagName)
+					.Where(e => e.Elements(referenceTagName).Any())
+					.ToList();
 
 				foreach (var itemGroup in referencesItemGroups)
 				{
-					FixProjectReferences(project.FilePath, itemGroup, projectsMap);
+					FixProjectReferences(project.FilePath, itemGroup, projectsMap, sdkStyle);
 				}
 
 				projectDoc.Save(project.FilePath);
 			}
 		}
 
-		private static void FixProjectReferences(string projectFilePath, XElement itemGroup, IDictionary<string, ProjectItem> projects)
+		static void FixProjectReferences(string projectFilePath, XElement itemGroup,
+			Dictionary<string, ProjectItem> projects, bool sdkStyle)
 		{
-			foreach (var item in itemGroup.Elements(ProjectFileNamespace + "Reference").ToList())
+
+			XName GetElementName(string name) => sdkStyle ? name : NonSDKProjectFileNamespace + name;
+
+			var referenceTagName = GetElementName("Reference");
+			var projectReferenceTagName = GetElementName("ProjectReference");
+
+			foreach (var item in itemGroup.Elements(referenceTagName).ToList())
 			{
 				var assemblyName = item.Attribute("Include")?.Value;
 				if (assemblyName != null && projects.TryGetValue(assemblyName, out var referencedProject))
 				{
 					item.Remove();
 
-					var projectReference = new XElement(ProjectFileNamespace + "ProjectReference",
-						new XElement(ProjectFileNamespace + "Project", referencedProject.Guid.ToString("B").ToUpperInvariant()),
-						new XElement(ProjectFileNamespace + "Name", referencedProject.ProjectName));
-					projectReference.SetAttributeValue("Include", GetRelativePath(projectFilePath, referencedProject.FilePath));
+					var projectReference = new XElement(
+						projectReferenceTagName,
+						new XAttribute("Include", GetRelativePath(projectFilePath, referencedProject.FilePath)));
+
+					// SDK-style projects do not use the <Project> and <Name> elements for project references.
+					// (Instead, those get read from the .csproj file in "Include".)
+					if (!sdkStyle)
+					{
+						projectReference.Add(
+							// no ToUpper() for uuids, most Microsoft tools seem to emit them in lowercase
+							// (no .ToLower() as .ToString("B") already outputs lowercase)
+							new XElement(NonSDKProjectFileNamespace + "Project", referencedProject.Guid.ToString("B")),
+							new XElement(NonSDKProjectFileNamespace + "Name", referencedProject.ProjectName));
+					}
 
 					itemGroup.Add(projectReference);
 				}
 			}
 		}
 
-		private static string GetRelativePath(string fromFilePath, string toFilePath)
+		static string GetRelativePath(string fromFilePath, string toFilePath)
 		{
 			Uri fromUri = new Uri(fromFilePath);
 			Uri toUri = new Uri(toFilePath);
diff --git a/ILSpy/Commands/SaveCodeContextMenuEntry.cs b/ILSpy/Commands/SaveCodeContextMenuEntry.cs
index 071f29599..2950a3200 100644
--- a/ILSpy/Commands/SaveCodeContextMenuEntry.cs
+++ b/ILSpy/Commands/SaveCodeContextMenuEntry.cs
@@ -78,7 +78,7 @@ namespace ICSharpCode.ILSpy.TextView
 					{
 						var assemblies = selectedNodes.OfType<AssemblyTreeNode>()
 							.Select(n => n.LoadedAssembly)
-							.Where(a => a.IsLoadedAsValidAssembly).ToArray();
+							.Where(a => a.IsLoadedAsValidAssembly).ToList();
 						SolutionWriter.CreateSolution(tabPage, textView, selectedPath, currentLanguage, assemblies);
 					}
 					return;
diff --git a/ILSpy/SolutionWriter.cs b/ILSpy/SolutionWriter.cs
index 29e8db8b0..62f6ef6c2 100644
--- a/ILSpy/SolutionWriter.cs
+++ b/ILSpy/SolutionWriter.cs
@@ -56,7 +56,7 @@ namespace ICSharpCode.ILSpy
 		/// <exception cref="ArgumentNullException">Thrown when <paramref name="textView"/>> or
 		/// <paramref name="assemblies"/> is null.</exception>
 		public static void CreateSolution(TabPageModel tabPage, DecompilerTextView textView, string solutionFilePath,
-			Language language, IEnumerable<LoadedAssembly> assemblies)
+			Language language, List<LoadedAssembly> assemblies)
 		{
 			if (textView == null)
 			{
@@ -77,7 +77,7 @@ namespace ICSharpCode.ILSpy
 
 			textView
 				.RunWithCancellation(ct => writer.CreateSolution(tabPage, assemblies, language, ct))
-				.Then(output => textView.ShowText(output))
+				.Then(textView.ShowText)
 				.HandleExceptions();
 		}
 
@@ -94,41 +94,29 @@ namespace ICSharpCode.ILSpy
 			projects = new ConcurrentBag<ProjectItem>();
 		}
 
-		async Task<AvalonEditTextOutput> CreateSolution(TabPageModel tabPage, IEnumerable<LoadedAssembly> assemblies, Language language, CancellationToken ct)
+		async Task<AvalonEditTextOutput> CreateSolution(TabPageModel tabPage, List<LoadedAssembly> allAssemblies, Language language, CancellationToken ct)
 		{
 			var result = new AvalonEditTextOutput();
 
-			var assembliesByShortName = assemblies.ToLookup(_ => _.ShortName);
+			var assembliesByShortName = allAssemblies.GroupBy(_ => _.ShortName).ToDictionary(_ => _.Key, _ => _.ToList());
 			bool first = true;
 			bool abort = false;
 
-			foreach (var item in assembliesByShortName)
+			foreach (var (shortName, assemblies) in assembliesByShortName)
 			{
-				var enumerator = item.GetEnumerator();
-				if (!enumerator.MoveNext())
-					continue;
-				var firstAssembly = enumerator.Current;
-				if (!enumerator.MoveNext())
+				if (assemblies.Count == 1)
+				{
 					continue;
+				}
+
 				if (first)
 				{
 					result.WriteLine("Duplicate assembly names selected, cannot generate a solution:");
 					abort = true;
+					first = false;
 				}
 
-				result.Write("- " + firstAssembly.Text + " conflicts with ");
-
-				first = true;
-				do
-				{
-					var asm = enumerator.Current;
-					if (!first)
-						result.Write(", ");
-					result.Write(asm.Text);
-					first = false;
-				} while (enumerator.MoveNext());
-				result.WriteLine();
-				first = false;
+				result.WriteLine("- " + assemblies[0].Text + " conflicts with " + string.Join(", ", assemblies.Skip(1)));
 			}
 
 			if (abort)
@@ -141,7 +129,7 @@ namespace ICSharpCode.ILSpy
 				// Explicitly create an enumerable partitioner here to avoid Parallel.ForEach's special cases for lists,
 				// as those seem to use static partitioning which is inefficient if assemblies take differently
 				// long to decompile.
-				await Task.Run(() => Parallel.ForEach(Partitioner.Create(assemblies),
+				await Task.Run(() => Parallel.ForEach(Partitioner.Create(allAssemblies),
 					new ParallelOptions { MaxDegreeOfParallelism = Environment.ProcessorCount, CancellationToken = ct },
 					item => WriteProject(tabPage, item, language, solutionDirectory, ct)))
 					.ConfigureAwait(false);
@@ -153,8 +141,8 @@ namespace ICSharpCode.ILSpy
 				}
 				else
 				{
-					await Task.Run(() => SolutionCreator.WriteSolutionFile(solutionFilePath, projects))
-						.ConfigureAwait(false);
+					await Task.Run(() => SolutionCreator.WriteSolutionFile(solutionFilePath, projects.ToList()), ct)
+							.ConfigureAwait(false);
 				}
 			}
 			catch (AggregateException ae)
@@ -184,14 +172,14 @@ namespace ICSharpCode.ILSpy
 			if (statusOutput.Count == 0)
 			{
 				result.WriteLine("Successfully decompiled the following assemblies into Visual Studio projects:");
-				foreach (var item in assemblies.Select(n => n.Text.ToString()))
+				foreach (var n in allAssemblies)
 				{
-					result.WriteLine(item);
+					result.WriteLine(n.Text.ToString());
 				}
 
 				result.WriteLine();
 
-				if (assemblies.Count() == projects.Count)
+				if (allAssemblies.Count == projects.Count)
 				{
 					result.WriteLine("Created the Visual Studio Solution file.");
 				}