Add a project framework inference/parsing utility

src/NuGet.Core/NuGet.Build.Tasks/NuGet.targets

@@ -929,6 +929,7 @@ Copyright (c) .NET Foundation. All rights reserved.
         <TargetFrameworkIdentifier>$(TargetFrameworkIdentifier)</TargetFrameworkIdentifier>
         <TargetFrameworkVersion>$(TargetFrameworkVersion)</TargetFrameworkVersion>
         <TargetFrameworkMoniker>$(TargetFrameworkMoniker)</TargetFrameworkMoniker>
+        <TargetFrameworkProfile>$(TargetFrameworkProfile)</TargetFrameworkProfile>
         <TargetPlatformIdentifier>$(TargetPlatformIdentifier)</TargetPlatformIdentifier>
         <TargetPlatformVersion>$(TargetPlatformVersion)</TargetPlatformVersion>
         <TargetPlatformMinVersion>$(TargetPlatformMinVersion)</TargetPlatformMinVersion>

src/NuGet.Core/NuGet.Commands/PublicAPI/net472/PublicAPI.Unshipped.txt

@@ -0,0 +1 @@
+static NuGet.Commands.MSBuildProjectFrameworkUtility.GetProjectFramework(string projectFilePath, string targetFrameworkMoniker, string targetFrameworkIdentifier, string targetFrameworkVersion, string targetFrameworkProfile, string targetPlatformIdentifier, string targetPlatformVersion, string targetPlatformMinVersion) -> NuGet.Frameworks.NuGetFramework

src/NuGet.Core/NuGet.Commands/PublicAPI/netcoreapp5.0/PublicAPI.Unshipped.txt

@@ -0,0 +1 @@
+static NuGet.Commands.MSBuildProjectFrameworkUtility.GetProjectFramework(string projectFilePath, string targetFrameworkMoniker, string targetFrameworkIdentifier, string targetFrameworkVersion, string targetFrameworkProfile, string targetPlatformIdentifier, string targetPlatformVersion, string targetPlatformMinVersion) -> NuGet.Frameworks.NuGetFramework

src/NuGet.Core/NuGet.Commands/PublicAPI/netstandard2.0/PublicAPI.Unshipped.txt

@@ -0,0 +1 @@
+static NuGet.Commands.MSBuildProjectFrameworkUtility.GetProjectFramework(string projectFilePath, string targetFrameworkMoniker, string targetFrameworkIdentifier, string targetFrameworkVersion, string targetFrameworkProfile, string targetPlatformIdentifier, string targetPlatformVersion, string targetPlatformMinVersion) -> NuGet.Frameworks.NuGetFramework

src/NuGet.Core/NuGet.Commands/RestoreCommand/Utility/MSBuildRestoreUtility.cs

@@ -423,6 +423,7 @@ private static IEnumerable<TargetFrameworkInformation> GetTargetFrameworkInforma
                 var targetFrameworkIdentifier = item.GetProperty("TargetFrameworkIdentifier");
                 var targetFrameworkVersion = item.GetProperty("TargetFrameworkVersion");
                 var targetFrameworkMoniker = item.GetProperty("TargetFrameworkMoniker");
+                var targetFrameworkProfile = item.GetProperty("TargetFrameworkProfile");
                 var targetPlatformIdentifier = item.GetProperty("TargetPlatformIdentifier");
                 var targetPlatformVersion = item.GetProperty("TargetPlatformVersion");
                 var targetPlatformMinVersion = item.GetProperty("TargetPlatformMinVersion");
@@ -434,18 +435,19 @@ private static IEnumerable<TargetFrameworkInformation> GetTargetFrameworkInforma
                 }
                 uniqueIds.Add(targetAlias);
 
-                IEnumerable<string> targetFramework = MSBuildProjectFrameworkUtility.GetProjectFrameworkStrings(
-                  projectFilePath: filePath,
-                  targetFrameworks: null,
-                  targetFramework: null,
-                  targetFrameworkMoniker: targetFrameworkMoniker,
-                  targetPlatformIdentifier: targetPlatformIdentifier,
-                  targetPlatformVersion: targetPlatformVersion,
-                  targetPlatformMinVersion: targetPlatformMinVersion);
+                NuGetFramework targetFramework = MSBuildProjectFrameworkUtility.GetProjectFramework(
+                    projectFilePath: filePath,
+                    targetFrameworkMoniker: targetFrameworkMoniker,
+                    targetFrameworkIdentifier: targetFrameworkIdentifier,
+                    targetFrameworkVersion: targetFrameworkVersion,
+                    targetFrameworkProfile: targetFrameworkProfile,
+                    targetPlatformIdentifier: targetPlatformIdentifier,
+                    targetPlatformVersion: targetPlatformVersion,
+                    targetPlatformMinVersion: targetPlatformMinVersion);
 
                 var targetFrameworkInfo = new TargetFrameworkInformation()
                 {
-                    FrameworkName = NuGetFramework.Parse(targetFramework.Single()),
+                    FrameworkName = targetFramework,
                     TargetAlias = targetAlias
                 };
                 if (restoreType == ProjectStyle.PackageReference ||

src/NuGet.Core/NuGet.Commands/Utility/MSBuildProjectFrameworkUtility.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using NuGet.Common;
 using NuGet.Frameworks;
 
@@ -34,6 +35,36 @@ public static IEnumerable<string> GetProjectFrameworkStrings(
                 isXnaWindowsPhoneProject: false);
         }
 
+        /// <summary>
+        /// Given the properties from an msbuild project file and a the file path, infer the target framework.
+        /// This method prioritizes projects without a framework, such as vcxproj and accounts for the mismatching arguments in UAP projects, where the TFI and TFV are set but should be ignored.
+        /// Likewise, this method will *ignore* unnecessary properties, such as TPI and TPV when profiles are used, and frameworks that do not support platforms have some default values.
+        /// </summary>
+        /// <returns>The inferred framework. Unsupported otherwise.</returns>
+        public static NuGetFramework GetProjectFramework(
+            string projectFilePath,
+            string targetFrameworkMoniker,
+            string targetFrameworkIdentifier,
+            string targetFrameworkVersion,
+            string targetFrameworkProfile,
+            string targetPlatformIdentifier,
+            string targetPlatformVersion,
+            string targetPlatformMinVersion)
+        {
+            return GetProjectFramework(
+                projectFilePath,
+                targetFrameworkMoniker,
+                targetFrameworkIdentifier,
+                targetFrameworkVersion,
+                targetFrameworkProfile,
+                targetPlatformIdentifier,
+                targetPlatformVersion,
+                targetPlatformMinVersion,
+                isXnaWindowsPhoneProject: false,
+                isManagementPackProject: false,
+                GetAsNuGetFramework);
+        }
+
         /// <summary>
         /// Determine the target framework of an msbuild project.
         /// </summary>
@@ -47,6 +78,37 @@ public static IEnumerable<string> GetProjectFrameworkStrings(
             string targetPlatformMinVersion,
             bool isXnaWindowsPhoneProject,
             bool isManagementPackProject)
+        {
+            return GetProjectFrameworks(
+                projectFilePath,
+                targetFrameworks,
+                targetFramework,
+                targetFrameworkMoniker,
+                targetFrameworkIdentifier: null,
+                targetFrameworkVersion: null,
+                targetFrameworkProfile: null,
+                targetPlatformIdentifier,
+                targetPlatformVersion,
+                targetPlatformMinVersion,
+                isXnaWindowsPhoneProject,
+                isManagementPackProject,
+                GetAsFrameworkString);
+        }
+
+        internal static IEnumerable<T> GetProjectFrameworks<T>(
+            string projectFilePath,
+            string targetFrameworks,
+            string targetFramework,
+            string targetFrameworkMoniker,
+            string targetFrameworkIdentifier,
+            string targetFrameworkVersion,
+            string targetFrameworkProfile,
+            string targetPlatformIdentifier,
+            string targetPlatformVersion,
+            string targetPlatformMinVersion,
+            bool isXnaWindowsPhoneProject,
+            bool isManagementPackProject,
+            Func<object, T> valueFactory)
         {
             var frameworks = new SortedSet<string>(StringComparer.OrdinalIgnoreCase);
 
@@ -55,7 +117,7 @@ public static IEnumerable<string> GetProjectFrameworkStrings(
 
             if (frameworks.Count > 0)
             {
-                return frameworks;
+                return frameworks.Select(e => valueFactory(e));
             }
 
             // TargetFramework property
@@ -65,26 +127,49 @@ public static IEnumerable<string> GetProjectFrameworkStrings(
             {
                 frameworks.Add(currentFrameworkString);
 
-                return frameworks;
+                return frameworks.Select(e => valueFactory(e));
             }
 
+            return new T[] { GetProjectFramework(
+                projectFilePath,
+                targetFrameworkMoniker,
+                targetFrameworkIdentifier,
+                targetFrameworkVersion,
+                targetFrameworkProfile,
+                targetPlatformIdentifier,
+                targetPlatformVersion,
+                targetPlatformMinVersion,
+                isXnaWindowsPhoneProject,
+                isManagementPackProject,
+                valueFactory) };
+        }
+
+        internal static T GetProjectFramework<T>(
+            string projectFilePath,
+            string targetFrameworkMoniker,
+            string targetFrameworkIdentifier,
+            string targetFrameworkVersion,
+            string targetFrameworkProfile,
+            string targetPlatformIdentifier,
+            string targetPlatformVersion,
+            string targetPlatformMinVersion,
+            bool isXnaWindowsPhoneProject,
+            bool isManagementPackProject,
+            Func<object, T> valueFactory)
+        {
             // C++ check
             if (projectFilePath?.EndsWith(".vcxproj", StringComparison.OrdinalIgnoreCase) == true)
             {
                 // The C++ project does not have a TargetFrameworkMoniker property set. 
                 // We hard-code the return value to Native.
-                frameworks.Add("Native, Version=0.0");
-
-                return frameworks;
+                return valueFactory("Native, Version=0.0");
             }
 
             // The MP project does not have a TargetFrameworkMoniker property set. 
             // We hard-code the return value to SCMPInfra.
             if (isManagementPackProject)
             {
-                frameworks.Add("SCMPInfra, Version=0.0");
-
-                return frameworks;
+                return valueFactory("SCMPInfra, Version=0.0");
             }
 
             // UAP/Windows store projects
@@ -113,55 +198,47 @@ public static IEnumerable<string> GetProjectFrameworkStrings(
                     platformIdentifier = FrameworkConstants.FrameworkIdentifiers.Windows;
                 }
 
-                frameworks.Add($"{platformIdentifier}, Version={platformVersion}");
-
-                return frameworks;
+                return valueFactory($"{platformIdentifier}, Version={platformVersion}");
             }
 
             if (!string.IsNullOrEmpty(platformVersion)
                 && StringComparer.OrdinalIgnoreCase.Equals(platformIdentifier, "UAP"))
             {
                 // Use the platform id and versions, this is done for UAP projects
-                frameworks.Add($"{platformIdentifier}, Version={platformVersion}");
-
-                return frameworks;
+                return valueFactory($"{platformIdentifier}, Version={platformVersion}");
             }
 
             // TargetFrameworkMoniker
-            currentFrameworkString = MSBuildStringUtility.TrimAndGetNullForEmpty(targetFrameworkMoniker);
+            var currentFrameworkString = MSBuildStringUtility.TrimAndGetNullForEmpty(targetFrameworkMoniker);
+            var trimmedTargetFrameworkIdentifier = MSBuildStringUtility.TrimAndGetNullForEmpty(targetFrameworkIdentifier);
+            var trimmedTargetFrameworkVersion = MSBuildStringUtility.TrimAndGetNullForEmpty(targetFrameworkVersion);
+            var hasTFIandTFV = trimmedTargetFrameworkIdentifier != null && trimmedTargetFrameworkVersion != null;
 
-            if (!string.IsNullOrEmpty(currentFrameworkString))
+            if (!string.IsNullOrEmpty(currentFrameworkString) || hasTFIandTFV)
             {
                 // XNA project lies about its true identity, reporting itself as a normal .NET 4.0 project.
                 // We detect it and changes its target framework to Silverlight4-WindowsPhone71
                 if (isXnaWindowsPhoneProject
                     && ".NETFramework,Version=v4.0".Equals(currentFrameworkString, StringComparison.OrdinalIgnoreCase))
                 {
                     currentFrameworkString = "Silverlight,Version=v4.0,Profile=WindowsPhone71";
+                    return valueFactory(currentFrameworkString);
                 }
 
-                // Workaround until https://github.com/NuGet/Home/issues/9871 is ready.
-                if (!string.IsNullOrEmpty(platformVersion))
-                {
-                    var framework = NuGetFramework.Parse(currentFrameworkString);
-                    if (framework.Version.Major >= 5 && framework.Framework.Equals(FrameworkConstants.FrameworkIdentifiers.NetCoreApp, StringComparison.OrdinalIgnoreCase))
-                    {
-                        currentFrameworkString = framework.GetShortFolderName() + $"-{platformIdentifier}{platformVersion}";
-                    }
-                }
+                NuGetFramework framework = hasTFIandTFV ?
+                    NuGetFramework.ParseComponents(
+                           trimmedTargetFrameworkIdentifier,
+                           trimmedTargetFrameworkVersion,
+                           MSBuildStringUtility.TrimAndGetNullForEmpty(targetFrameworkProfile),
+                           platformIdentifier,
+                           platformVersion) :
+                    NuGetFramework.Parse(currentFrameworkString);
 
-                frameworks.Add(currentFrameworkString);
-
-                return frameworks;
+                return valueFactory(framework);
             }
 
-            // Default to unsupported it no framework can be found.
-            if (frameworks.Count < 1)
-            {
-                frameworks.Add(NuGetFramework.UnsupportedFramework.ToString());
-            }
-
-            return frameworks;
+            // Default to unsupported it no framework was found.
+            return valueFactory(NuGetFramework.UnsupportedFramework);
         }
 
         /// <summary>
@@ -221,16 +298,37 @@ public static NuGetFramework GetProjectFrameworkReplacement(NuGetFramework frame
             return framework;
         }
 
-        private static string GetPropertyOrNull(string propertyName, IDictionary<string, string> projectProperties)
+        /// <summary>
+        /// Get a NuGetFramework out of the passed object. The argument is expected to either be a <see cref="NuGetFramework"/> or <see cref="string"/>.
+        /// </summary>
+        private static NuGetFramework GetAsNuGetFramework(object arg)
+        {
+            if (arg is NuGetFramework nugetFramework)
+            {
+                return nugetFramework;
+            }
+            if (arg is string frameworkString)
+            {
+                return NuGetFramework.Parse(frameworkString);
+            }
+            throw new ArgumentException("Unexpected object type");
+        }
+
+        /// <summary>
+        /// Get a roundtrippable framework string out of the passed object. The argument is expected to either be a <see cref="NuGetFramework"/> or <see cref="string"/>.
+        /// </summary>
+        private static string GetAsFrameworkString(object arg)
         {
-            string value;
-            if (projectProperties.TryGetValue(propertyName, out value)
-                && !string.IsNullOrEmpty(value))
+            if (arg is string str)
+            {
+                return str;
+            }
+            if (arg is NuGetFramework framework)
             {
-                return value;
+                return framework.DotNetFrameworkName;
             }
 
-            return null;
+            throw new ArgumentException("Unexpected object type");
         }
     }
 }