Handle error conditions when .NET 3.5 is not installed and the user tries to open/build .NET 2.0/3.0/3.5 projects.

src/AddIns/BackendBindings/CSharpBinding/Project/Src/Project/CSharpProject.cs

@@ -109,7 +109,13 @@ namespace CSharpBinding
 		
 		public override IEnumerable<CompilerVersion> GetAvailableCompilerVersions()
 		{
-			return new[] { msbuild20, msbuild35, msbuild40 };
+			List<CompilerVersion> versions = new List<CompilerVersion>();
+			if (DotnetDetection.IsDotnet35SP1Installed()) {
+				versions.Add(msbuild20);
+				versions.Add(msbuild35);
+			}
+			versions.Add(msbuild40);
+			return versions;
 		}
 		
 		/*

src/Main/Base/Project/ICSharpCode.SharpDevelop.csproj

@@ -367,6 +367,7 @@
     <Compile Include="Src\Project\ProjectStartException.cs" />
     <Compile Include="Src\Project\ProjectLoadException.cs" />
     <Compile Include="Src\Project\ProjectPropertyChangedEventArgs.cs" />
+    <Compile Include="Src\Project\ProjectUpgradeException.cs" />
     <Compile Include="Src\Project\Solution\Project_TypeGuids.cs" />
     <Compile Include="Src\Project\TargetFramework.cs" />
     <Compile Include="Src\Services\Debugger\BreakpointBookmark.cs" />
@@ -794,6 +795,7 @@
     <Compile Include="Src\Gui\Dialogs\ReferenceDialog\DiscoveryNetworkCredential.cs" />
     <Compile Include="Src\Services\ProjectService\ProjectLoader.cs" />
     <Compile Include="Src\Services\WebProjectService\WebProjectService.cs" />
+    <Compile Include="Src\Util\DotnetDetection.cs" />
     <Compile Include="Src\Util\FakeXmlViewContent.cs" />
     <Compile Include="Src\Util\ReactiveExtensions.cs" />
     <Compile Include="Src\Util\TreeNode.cs" />

src/Main/Base/Project/Src/Gui/Dialogs/NewProjectDialog.cs

@@ -164,7 +164,7 @@ namespace ICSharpCode.SharpDevelop.Project.Dialogs
 			targetFrameworkComboBox.Items.Clear();
 			if (categoryTreeView.SelectedNode != null) {
 				foreach (TargetFramework fx in TargetFramework.TargetFrameworks) {
-					if (fx.DisplayName == null)
+					if (fx.DisplayName == null || !fx.IsAvailable())
 						continue;
 					foreach (TemplateItem item in ((Category)categoryTreeView.SelectedNode).Templates) {
 						if (item.Template.HasSupportedTargetFrameworks && item.Template.SupportsTargetFramework(fx)) {

src/Main/Base/Project/Src/Project/CompilableProject.cs

@@ -551,7 +551,13 @@ namespace ICSharpCode.SharpDevelop.Project
 		
 		public virtual IEnumerable<CompilerVersion> GetAvailableCompilerVersions()
 		{
-			return new[] { msbuild20, msbuild35, msbuild40 };
+			List<CompilerVersion> versions = new List<CompilerVersion>();
+			if (DotnetDetection.IsDotnet35SP1Installed()) {
+				versions.Add(msbuild20);
+				versions.Add(msbuild35);
+			}
+			versions.Add(msbuild40);
+			return versions;
 		}
 		
 		public virtual void UpgradeProject(CompilerVersion newVersion, TargetFramework newFramework)
@@ -560,6 +566,14 @@ namespace ICSharpCode.SharpDevelop.Project
 				lock (SyncRoot) {
 					TargetFramework oldFramework = this.CurrentTargetFramework;
 					if (newVersion != null && GetAvailableCompilerVersions().Contains(newVersion)) {
+						string newToolsVersion = newVersion.MSBuildVersion.Major + "." + newVersion.MSBuildVersion.Minor;
+						if (!MSBuildProjectCollection.ContainsToolset(newToolsVersion)) {
+							string errorMessage = "MSBuild Tools version '" + newToolsVersion + "' is not available.";
+							if (newToolsVersion == "2.0" || newToolsVersion == "3.5") {
+								errorMessage += Environment.NewLine + "Please install the .NET Framework 3.5 SP1.";
+							}
+							throw new ProjectUpgradeException(errorMessage);
+						}
 						SetToolsVersion(newVersion.MSBuildVersion.Major + "." + newVersion.MSBuildVersion.Minor);
 					}
 					if (newFramework != null) {

src/Main/Base/Project/Src/Project/Converter/IUpgradableProject.cs

@@ -43,6 +43,7 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 		/// </summary>
 		/// <param name="newVersion">The new compiler version. If this property is null, the compiler version is not changed.</param>
 		/// <param name="newFramework">The new target framework. If this property is null, the target framework is not changed.</param>
+		/// <exception cref="ProjectUpgradeException">Upgrading the project failed.</exception>
 		void UpgradeProject(CompilerVersion newVersion, TargetFramework newFramework);
 	}
 	
@@ -56,6 +57,7 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 			return from fx in TargetFramework.TargetFrameworks
 				where fx.MinimumMSBuildVersion != null
 				where MSBuildVersion >= fx.MinimumMSBuildVersion
+				where fx.IsAvailable()
 				select fx;
 		}
 		

src/Main/Base/Project/Src/Project/Converter/UpgradeView.xaml.cs

@@ -7,7 +7,6 @@ using System.ComponentModel;
 using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
-
 using ICSharpCode.Core.Presentation;
 
 namespace ICSharpCode.SharpDevelop.Project.Converter
@@ -130,16 +129,13 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 				// -> available target frameworks is the intersection of all compiler's target framework,
 				// and "Do not change" is always available
 				
-				var supportedTargetFrameworks =
+				availableFrameworks = (
 					from Entry entry in listView.SelectedItems
 					where entry.CompilerVersion != null
-					select entry.CompilerVersion.GetSupportedTargetFrameworks();
+					from fx in entry.CompilerVersion.GetSupportedTargetFrameworks()
+					select fx
+				).Distinct().ToList();
 				
-				if (supportedTargetFrameworks.Any()) {
-					availableFrameworks = supportedTargetFrameworks.Aggregate((a, b) => a.Intersect(b)).ToList();
-				} else {
-					availableFrameworks = new List<TargetFramework>();
-				}
 				doNotChangeAllowed = true;
 			} else {
 				// Specific compiler version is selected
@@ -181,6 +177,7 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 			TargetFramework oldSelectedFramework = newFrameworkComboBox.SelectedValue as TargetFramework;
 			if (!newFrameworkSelectionSetByUser || oldSelectedFramework == null) {
 				newFrameworkSelectionSetByUser = false;
+				if (availableFrameworks.Contains(frameworkUsedByAllProjects))
 					newFrameworkComboBox.SelectedValue = frameworkUsedByAllProjects;
 			}
 			newFrameworkSelectionChangingByCode = false;
@@ -233,8 +230,14 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 			
 			
 			foreach (Entry entry in listView.SelectedItems) {
+				try {
 					entry.UpgradeProject(selectedCompiler, selectedFramework);
+				} catch (ProjectUpgradeException ex) {
+					Core.MessageService.ShowError("Cannot upgrade '" + entry.Name + "': " + ex.Message);
+					break;
 				}
+			}
+			
 			solution.Save();
 			UpdateCompilerComboBox();
 		}

src/Main/Base/Project/Src/Project/MSBuildBasedProject.cs

@@ -123,6 +123,7 @@ namespace ICSharpCode.SharpDevelop.Project
 					projectFile.ToolsVersion = newToolsVersion;
 					userProjectFile.ToolsVersion = newToolsVersion;
 				});
+			
 			if (MinimumSolutionVersionChanged != null)
 				MinimumSolutionVersionChanged(this, EventArgs.Empty);
 		}
@@ -1206,8 +1207,14 @@ namespace ICSharpCode.SharpDevelop.Project
 				throw new ArgumentNullException("loadInformation");
 			this.Name = loadInformation.ProjectName;
 			isLoading = true;
+			try {
 				try {
 					LoadProjectInternal(loadInformation);
+				} catch (InvalidProjectFileException ex) {
+					if (!(ex.ErrorCode == "MSB4132" && UpgradeToolsVersion(loadInformation))) {
+						throw;
+					}
+				}
 			} catch (InvalidProjectFileException ex) {
 				LoggingService.Warn(ex);
 				LoggingService.Warn("ErrorCode = " + ex.ErrorCode);
@@ -1217,6 +1224,46 @@ namespace ICSharpCode.SharpDevelop.Project
 			}
 		}
 		
+		const string autoUpgradeNewToolsVersion = "4.0";
+		
+		bool UpgradeToolsVersion(ProjectLoadInformation loadInformation)
+		{
+			if (loadInformation.upgradeToolsVersion != null)
+				return false;
+			if (!CanUpgradeToolsVersion())
+				return false;
+			loadInformation.ProgressMonitor.ShowingDialog = true;
+			StringTagPair[] tags = {
+				new StringTagPair("ProjectName", loadInformation.ProjectName),
+				new StringTagPair("OldToolsVersion", projectFile.ToolsVersion),
+				new StringTagPair("NewToolsVersion", autoUpgradeNewToolsVersion)
+			};
+			string message = StringParser.Parse("${res:ICSharpCode.SharpDevelop.Project.UpgradeView.UpdateOnLoadDueToMissingMSBuild}", tags);
+			string upgradeButton = StringParser.Parse("${res:ICSharpCode.SharpDevelop.Project.UpgradeView.UpdateToMSBuildButton}", tags);
+			int result = MessageService.ShowCustomDialog(
+				"${res:ICSharpCode.SharpDevelop.Project.UpgradeView.Title}",
+				message,
+				0, 1, upgradeButton, "${res:Global.CancelButtonText}");
+			loadInformation.ProgressMonitor.ShowingDialog = false;
+			if (result == 0) {
+				loadInformation.upgradeToolsVersion = true;
+				LoadProjectInternal(loadInformation);
+				return true;
+			} else {
+				loadInformation.upgradeToolsVersion = false;
+				return false;
+			}
+		}
+		
+		bool CanUpgradeToolsVersion()
+		{
+			if (projectFile == null)
+				return false;
+			if (string.IsNullOrEmpty(projectFile.ToolsVersion))
+				return true;
+			return projectFile.ToolsVersion == "2.0" || projectFile.ToolsVersion == "3.5";
+		}
+		
 		void LoadProjectInternal(ProjectLoadInformation loadInformation)
 		{
 			this.projectCollection = loadInformation.ParentSolution.MSBuildProjectCollection;
@@ -1224,6 +1271,9 @@ namespace ICSharpCode.SharpDevelop.Project
 			this.ActivePlatform = loadInformation.Platform;
 			
 			projectFile = ProjectRootElement.Open(loadInformation.FileName, projectCollection);
+			if (loadInformation.upgradeToolsVersion == true && CanUpgradeToolsVersion()) {
+				projectFile.ToolsVersion = autoUpgradeNewToolsVersion;
+			}
 			
 			string userFileName = loadInformation.FileName + ".user";
 			if (File.Exists(userFileName)) {

src/Main/Base/Project/Src/Project/MSBuildEngine/MSBuildEngine.cs

@@ -265,7 +265,12 @@ namespace ICSharpCode.SharpDevelop.Project
 			}
 			
 			if (projectMinimumSolutionVersion <= Solution.SolutionVersionVS2008) {
+				if (DotnetDetection.IsDotnet35SP1Installed()) {
 					BuildWorkerManager.MSBuild35.RunBuildJob(job, loggerChain, OnDone, feedbackSink.ProgressMonitor.CancellationToken);
+				} else {
+					loggerChain.HandleError(new BuildError(job.ProjectFileName, ".NET 3.5 SP1 is required to build this project."));
+					OnDone(false);
+				}
 			} else {
 				BuildWorkerManager.MSBuild40.RunBuildJob(job, loggerChain, OnDone, feedbackSink.ProgressMonitor.CancellationToken);
 			}

src/Main/Base/Project/Src/Project/ProjectLoadInformation.cs

@@ -19,6 +19,8 @@ namespace ICSharpCode.SharpDevelop.Project
 		public IList<ProjectSection> ProjectSections {get; set;}
 		internal string Guid { get; set; }
 		
+		internal bool? upgradeToolsVersion;
+		
 		Gui.IProgressMonitor progressMonitor = new Gui.DummyProgressMonitor();
 		
 		/// <summary>

src/Main/Base/Project/Src/Project/ProjectUpgradeException.cs

@@ -0,0 +1,31 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Runtime.Serialization;
+
+namespace ICSharpCode.SharpDevelop.Project
+{
+	/// <summary>
+	/// This exception occurs when upgrading a project fails.
+	/// </summary>
+	[Serializable]
+	public class ProjectUpgradeException : Exception
+	{
+		public ProjectUpgradeException() : base()
+		{
+		}
+		
+		public ProjectUpgradeException(string message) : base(message)
+		{
+		}
+		
+		public ProjectUpgradeException(string message, Exception innerException) : base(message, innerException)
+		{
+		}
+		
+		protected ProjectUpgradeException(SerializationInfo info, StreamingContext context) : base(info, context)
+		{
+		}
+	}
+}

src/Main/Base/Project/Src/Project/TargetFramework.cs

@@ -9,7 +9,9 @@ namespace ICSharpCode.SharpDevelop.Project
 	{
 		public readonly static TargetFramework Net20 = new TargetFramework("v2.0", ".NET Framework 2.0") {
 			SupportedRuntimeVersion = "v2.0.50727",
-			MinimumMSBuildVersion = new Version(2, 0)
+			MinimumMSBuildVersion = new Version(2, 0),
+			// .NET 2.0/3.0/3.5 can only be used if .NET 3.5 SP1 is installed
+			IsAvailable = DotnetDetection.IsDotnet35SP1Installed
 		};
 		public readonly static TargetFramework Net30 = new TargetFramework("v3.0", ".NET Framework 3.0") {
 			SupportedRuntimeVersion = "v2.0.50727",
@@ -28,7 +30,8 @@ namespace ICSharpCode.SharpDevelop.Project
 			BasedOn = Net35,
 			MinimumMSBuildVersion = new Version(4, 0),
 			SupportedSku = ".NETFramework,Version=v4.0",
-			RequiresAppConfigEntry = true
+			RequiresAppConfigEntry = true,
+			IsAvailable = DotnetDetection.IsDotnet40Installed
 		};
 		public readonly static TargetFramework Net40Client = new ClientProfileTargetFramework(Net40) {
 			BasedOn = Net35Client
@@ -38,7 +41,8 @@ namespace ICSharpCode.SharpDevelop.Project
 			MinimumMSBuildVersion = new Version(4, 0),
 			SupportedRuntimeVersion = "v4.0",
 			SupportedSku = ".NETFramework,Version=v4.5",
-			RequiresAppConfigEntry = true
+			RequiresAppConfigEntry = true,
+			IsAvailable = DotnetDetection.IsDotnet45Installed
 		};
 		public readonly static TargetFramework Net45Client = new ClientProfileTargetFramework(Net45) {
 			BasedOn = Net40Client
@@ -66,6 +70,12 @@ namespace ICSharpCode.SharpDevelop.Project
 			this.name = name;
 			this.displayName = displayName;
 			this.SupportedRuntimeVersion = name;
+			this.IsAvailable = delegate {
+				if (this.BasedOn != null)
+					return this.BasedOn.IsAvailable();
+				else
+					return true;
+			};
 		}
 		
 		public string Name {
@@ -76,6 +86,11 @@ namespace ICSharpCode.SharpDevelop.Project
 			get { return displayName; }
 		}
 		
+		/// <summary>
+		/// Function that determines if this target framework is available.
+		/// </summary>
+		public Func<bool> IsAvailable { get; set; }
+		
 		/// <summary>
 		/// Supported runtime version string for app.config
 		/// </summary>
@@ -128,6 +143,7 @@ namespace ICSharpCode.SharpDevelop.Project
 			this.FullFramework = fullFramework;
 			this.SupportedRuntimeVersion = fullFramework.SupportedRuntimeVersion;
 			this.MinimumMSBuildVersion = fullFramework.MinimumMSBuildVersion;
+			this.IsAvailable = fullFramework.IsAvailable;
 			if (fullFramework.SupportedSku != null)
 				this.SupportedSku = fullFramework.SupportedSku + ",Profile=Client";
 			else

src/Main/Base/Project/Src/Util/DotnetDetection.cs

@@ -0,0 +1,29 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using Microsoft.Win32;
+
+namespace ICSharpCode.SharpDevelop
+{
+	public class DotnetDetection
+	{
+		public static bool IsDotnet35SP1Installed()
+		{
+			using (var key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5")) {
+				return key != null && (key.GetValue("SP") as int?) >= 1;
+			}
+		}
+		
+		public static bool IsDotnet40Installed()
+		{
+			return true; // required for SD to run
+		}
+		
+		public static bool IsDotnet45Installed()
+		{
+			Version dotnet45Beta = new Version(4, 0, 30319, 17379);
+			return Environment.Version >= dotnet45Beta;
+		}
+	}
+}