Fix target framework for NuGet dependency being ignored.

A NuGet package can specify a dependency on another NuGet package when
a particular target framework is being installed:

    <dependencies>
       <group targetFramework="net40">
          <dependency id="MyDependency" version="1.0"/>
       </group>
    </dependencies>

Installing this NuGet package into a project that targets net20 and
the MyDependency being unavailable on any NuGet feed should not fail.
Only installing the NuGet package into a project that targets net40
will this dependency be resolved.

src/AddIns/Misc/PackageManagement/Project/Src/Design/FakePackageManagementProject.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-
+using System.Runtime.Versioning;
 using ICSharpCode.PackageManagement;
 using ICSharpCode.PackageManagement.EnvDTE;
 using NuGet;
@@ -42,6 +42,8 @@ namespace ICSharpCode.PackageManagement.Design
 		
 		public string Name { get; set; }
 		
+		public FrameworkName TargetFramework { get; set; }
+		
 		public bool IsPackageInstalled(string packageId)
 		{
 			return FakePackages.Any(p => p.Id == packageId);

src/AddIns/Misc/PackageManagement/Project/Src/IPackageManagementProject.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.Versioning;
 
 using ICSharpCode.PackageManagement.EnvDTE;
 using NuGet;
@@ -18,6 +19,7 @@ namespace ICSharpCode.PackageManagement
 		event EventHandler<PackageOperationEventArgs> PackageReferenceRemoving;
 		
 		string Name { get; }
+		FrameworkName TargetFramework { get; }
 		ILogger Logger { get; set; }
 		IPackageRepository SourceRepository { get; }
 		

src/AddIns/Misc/PackageManagement/Project/Src/PackageManagementProject.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.Versioning;
 
 using ICSharpCode.PackageManagement.EnvDTE;
 using ICSharpCode.SharpDevelop.Project;
@@ -17,6 +18,7 @@ namespace ICSharpCode.PackageManagement
 		ISharpDevelopProjectManager projectManager;
 		IPackageManagementEvents packageManagementEvents;
 		MSBuildBasedProject msbuildProject;
+		ProjectTargetFramework targetFramework;
 		
 		public PackageManagementProject(
 			IPackageRepository sourceRepository,
@@ -26,6 +28,7 @@ namespace ICSharpCode.PackageManagement
 		{
 			SourceRepository = sourceRepository;
 			msbuildProject = project;
+			targetFramework = new ProjectTargetFramework(project);
 			this.packageManagementEvents = packageManagementEvents;
 			
 			packageManager = packageManagerFactory.CreatePackageManager(sourceRepository, project);
@@ -36,6 +39,10 @@ namespace ICSharpCode.PackageManagement
 			get { return msbuildProject.Name; }
 		}
 		
+		public FrameworkName TargetFramework {
+			get { return targetFramework.TargetFrameworkName; }
+		}
+		
 		public IPackageRepository SourceRepository { get; private set; }
 		
 		public ILogger Logger {

src/AddIns/Misc/PackageManagement/Project/Src/PackageOperationsResolverFactory.cs

@@ -17,7 +17,7 @@ namespace ICSharpCode.PackageManagement
 			return new InstallWalker(
 				localRepository,
 				sourceRepository,
-				null,
+				installAction.ProjectTargetFramework,
 				logger,
 				installAction.IgnoreDependencies,
 				installAction.AllowPrereleaseVersions,

src/AddIns/Misc/PackageManagement/Project/Src/ProcessPackageAction.cs

@@ -2,6 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using System.Runtime.Versioning;
 using ICSharpCode.PackageManagement.Scripting;
 using ICSharpCode.SharpDevelop.Project;
 using NuGet;
@@ -28,6 +29,10 @@ namespace ICSharpCode.PackageManagement
 		public IPackageScriptRunner PackageScriptRunner { get; set; }
 		public bool AllowPrereleaseVersions { get; set; }
 		
+		public FrameworkName ProjectTargetFramework {
+			get { return Project.TargetFramework; }
+		}
+		
 		public virtual bool HasPackageScriptsToRun()
 		{
 			return false;

src/AddIns/Misc/PackageManagement/Test/Src/PackageManagementProjectTests.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.Versioning;
 
 using ICSharpCode.PackageManagement;
 using ICSharpCode.PackageManagement.Design;
@@ -31,17 +32,25 @@ namespace PackageManagement.Tests
 		UpdatePackagesAction updatePackagesAction;
 		
 		void CreateProject()
+		{
+			fakeMSBuildProject = ProjectHelper.CreateTestProject();
+			fakeMSBuildProject.SetProperty("TargetFrameworkIdentifier", null);
+			fakeMSBuildProject.SetProperty("TargetFrameworkVersion", "v4.0");
+			fakeMSBuildProject.SetProperty("TargetFrameworkProfile", null);
+			CreateProject(fakeMSBuildProject);
+		}
+		
+		void CreateProject(MSBuildBasedProject msbuildProject)
 		{
 			fakePackageManagerFactory = new FakePackageManagerFactory();
 			fakePackageManager = fakePackageManagerFactory.FakePackageManager;
 			fakeProjectManager = fakePackageManager.FakeProjectManager;
 			fakeSourceRepository = new FakePackageRepository();
-			fakeMSBuildProject = ProjectHelper.CreateTestProject();
 			fakePackageManagementEvents = new FakePackageManagementEvents();
 			
 			project = new PackageManagementProject(
 				fakeSourceRepository,
-				fakeMSBuildProject,
+				msbuildProject,
 				fakePackageManagementEvents,
 				fakePackageManagerFactory);
 		}
@@ -744,5 +753,20 @@ namespace PackageManagement.Tests
 			Assert.AreEqual(package, fakePackageManager.PackagePassedToUpdatePackageReference);
 			Assert.AreEqual(updatePackagesAction, fakePackageManager.SettingsPassedToUpdatePackageReference);
 		}
+		
+		[Test]
+		public void TargetFramework_TargetFrameworkVersion40DefinedInProject_ReturnsFullDotNetFramework40()
+		{
+			fakeMSBuildProject = ProjectHelper.CreateTestProject();
+			fakeMSBuildProject.SetProperty("TargetFrameworkIdentifier", null);
+			fakeMSBuildProject.SetProperty("TargetFrameworkVersion", "v4.0");
+			fakeMSBuildProject.SetProperty("TargetFrameworkProfile", null);
+			CreateProject(fakeMSBuildProject);
+			var expectedName = new FrameworkName(".NETFramework, Version=v4.0");
+			
+			FrameworkName targetFramework = project.TargetFramework;
+			
+			Assert.AreEqual(expectedName, targetFramework);
+		}
 	}
 }

src/AddIns/Misc/PackageManagement/Test/Src/ProcessPackageActionTests.cs

@@ -2,6 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using System.Runtime.Versioning;
 using ICSharpCode.PackageManagement;
 using ICSharpCode.PackageManagement.Design;
 using ICSharpCode.PackageManagement.Scripting;
@@ -155,5 +156,17 @@ namespace PackageManagement.Tests
 			
 			Assert.AreEqual(expectedException, exception);
 		}
+		
+		[Test]
+		public void ProjectTargetFramework_ProjectTargetFrameworkIsNet40_ReturnsNet40()
+		{
+			CreateAction();
+			var expectedTargetFramework = new FrameworkName(".NETFramework, Version=v4.0");
+			fakeProject.TargetFramework = expectedTargetFramework;
+			
+			FrameworkName targetFramework = action.ProjectTargetFramework;
+			
+			Assert.AreEqual(expectedTargetFramework, targetFramework);
+		}
 	}
 }