Adds default outputProperties Item

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets

@@ -50,6 +50,10 @@ Copyright (c) .NET Foundation. All rights reserved.
     <GenerateRuntimeConfigurationFilesInputs Include="$(UserRuntimeConfig)" Condition=" Exists($(UserRuntimeConfig)) " />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFrameworks)' != '' And '$(TargetFramework)' != ''">
+    <ProjectConfigurationDescription Include="TargetFramework=$(TargetFramework)" />
+  </ItemGroup>
+
   <PropertyGroup Condition="'$(GenerateRuntimeConfigDevFile)' == ''">
     <GenerateRuntimeConfigDevFile>true</GenerateRuntimeConfigDevFile>
     <!-- Post-net6.0, stop generating *.runtimeconfig.dev.json files to reduce probing paths. -->

src/Tests/Microsoft.NET.Build.Tests/ProjectConfigurationDescriptionTest.cs

@@ -0,0 +1,56 @@
+using System.IO;
+using Microsoft.NET.TestFramework;
+using Microsoft.NET.TestFramework.Assertions;
+using Microsoft.NET.TestFramework.Commands;
+using FluentAssertions;
+using Microsoft.NET.TestFramework.ProjectConstruction;
+using Xunit.Abstractions;
+using Xunit;
+
+namespace Microsoft.NET.Build.Tests
+{
+    public class ProjectConfigurationDescription : SdkTest
+    {
+        public ProjectConfigurationDescription(ITestOutputHelper log) : base(log)
+        {
+        }
+
+        [Fact]
+        public void ProjectConfigurationDescription_DefaultTest()
+        {
+            const string errorTargetFramework = "net48";
+
+            var testProj = new TestProject()
+            {
+                Name = "MultitargetingConfigurationDescription",
+                TargetFrameworks = $"{ToolsetInfo.CurrentTargetFramework};{errorTargetFramework}",
+                IsExe = true,
+                IsSdkProject = true
+            };
+
+            var testAsset = _testAssetsManager.CreateTestProject(testProj);
+            File.WriteAllText(Path.Combine(testAsset.Path, testProj.Name, $"{testProj.Name}.cs"), @"
+            using System;
+            class Program
+            {
+                static void Main(string[] args)
+                {
+                    #if NET472_OR_GREATER
+                        Consol.WriteLine(""NET472"");
+                    #endif
+                    #if NETCOREAPP
+                        Console.WriteLine(""NETCOREAPP"");
+                    #endif
+                }
+            }");
+
+            var buildCommand = new BuildCommand(Log, Path.Combine(testAsset.Path, testProj.Name));
+            buildCommand
+                .Execute()
+                .Should()
+                .Fail()
+                .And
+                .HaveStdOutContaining($"::TargetFramework={errorTargetFramework}");
+        }
+    }
+}