When loading a portable library project and the portable library tools are not installed, display an error message directing the user to the download.

src/Main/Base/Project/Project/PortableLibrary/CheckPortableLibraryInstalled.cs

@@ -17,9 +17,6 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.IO;
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Gui;
 
@@ -30,15 +27,22 @@ namespace ICSharpCode.SharpDevelop.Project.PortableLibrary
 	/// </summary>
 	public class CheckPortableLibraryInstalled : AbstractCommand
 	{
+		public static string CouldNotFindToolsDescription {
+			get {
+				return StringParser.Parse(
+					"${res:PortableLibrary.CouldNotFindTools}" + Environment.NewLine + Environment.NewLine
+					+ "${res:PortableLibrary.ToolsInstallationHelp}");
+			}
+		}
+		
+		public static string DownloadUrl {
+			get { return "http://go.microsoft.com/fwlink/?LinkId=210823"; }
+		}
+		
 		public override void Run()
 		{
 			if (!ProfileList.IsPortableLibraryInstalled()) {
-				using (ToolNotFoundDialog dlg = new ToolNotFoundDialog(
-					StringParser.Parse(
-						"${res:PortableLibrary.CouldNotFindTools}" + Environment.NewLine + Environment.NewLine +
-						"${res:PortableLibrary.ToolsInstallationHelp}"),
-					"http://go.microsoft.com/fwlink/?LinkId=210823"
-				)) {
+				using (ToolNotFoundDialog dlg = new ToolNotFoundDialog(CouldNotFindToolsDescription, DownloadUrl)) {
 					// our message is long, so make the window bigger than usual
 					dlg.Width += 70;
 					dlg.Height += 70;

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

@@ -34,6 +34,7 @@ using ICSharpCode.SharpDevelop.Dom;
 using Microsoft.Build.Construction;
 using Microsoft.Build.Evaluation;
 using Microsoft.Build.Exceptions;
+using ICSharpCode.SharpDevelop.Project.PortableLibrary;
 using MSBuild = Microsoft.Build.Evaluation;
 
 namespace ICSharpCode.SharpDevelop.Project
@@ -1243,6 +1244,11 @@ namespace ICSharpCode.SharpDevelop.Project
 						} else {
 							throw;
 						}
+					} else if (ex.ErrorCode == "MSB4019" && ex.BaseMessage.Contains("Microsoft.Portable.") && !ProfileList.IsPortableLibraryInstalled()) {
+						throw new ToolNotFoundProjectLoadException(ex.Message, ex) {
+							Description = CheckPortableLibraryInstalled.CouldNotFindToolsDescription,
+							LinkTarget = CheckPortableLibraryInstalled.DownloadUrl
+						};
 					} else {
 						throw;
 					}