Use MSBuild to find target framework

Author: GarrettBeatty

src/Amazon.Common.DotNetCli.Tools/Amazon.Common.DotNetCli.Tools.csproj

@@ -11,9 +11,12 @@
     <PackageReference Include="AWSSDK.SecurityToken" Version="3.7.300.81" />
     <PackageReference Include="AWSSDK.SSO" Version="3.7.300.80" />
     <PackageReference Include="AWSSDK.SSOOIDC" Version="3.7.301.75" />
+	<None Include="Assets\**\*" CopyToOutputDirectory="PreserveNewest" CopyToPublishDirectory="PreserveNewest" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Assets\" />
   </ItemGroup>
   <PropertyGroup>
     <NoWarn>1701;1702;1705;1591</NoWarn>
   </PropertyGroup>
-
 </Project>

src/Amazon.Common.DotNetCli.Tools/Assets/AmazonCommonDotNetCliTools.targets

@@ -0,0 +1,10 @@
+<Project>
+	<Target Name="_AmazonCommonToolsExtractTargetFrameworks">
+		<ItemGroup>
+			<_TargetFrameworks Include="$(TargetFramework)" Condition="'$(TargetFramework)' != ''" />
+			<_TargetFrameworks Include="$(TargetFrameworks)" Condition="'$(TargetFrameworks)' != ''" />
+		</ItemGroup>
+		<WriteLinesToFile File="$(_AmazonCommonToolsTargetFrameworksFile)" Lines="@(_TargetFrameworks)" Overwrite="true" />
+	</Target>
+</Project>
+

src/Amazon.Common.DotNetCli.Tools/Utilities.cs

@@ -207,14 +207,85 @@ public static string DeterminePublishLocation(string workingDirectory, string pr
 
         public static string LookupTargetFrameworkFromProjectFile(string projectLocation)
         {
+
             var projectFile = FindProjectFileInDirectory(projectLocation);
+            if (string.IsNullOrEmpty(projectFile))
+            {
+                throw new FileNotFoundException("Could not find a project file in the specified directory.");
+            }
 
-            var xdoc = XDocument.Load(projectFile);
+            var outputFile = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
+            var targetsFile = FindTargetsFile();
+
+            if (!File.Exists(targetsFile))
+            {
+                throw new FileNotFoundException($"Could not find the custom .targets file at {targetsFile}");
+            }
+
+            var arguments = new[]
+            {
+                "msbuild",
+                projectFile,
+                "/nologo",
+                "/t:_AmazonCommonToolsExtractTargetFrameworks",
+                $"/p:_AmazonCommonToolsTargetFrameworksFile={outputFile}",
+                "/p:Configuration=Debug",
+                $"\"/p:CustomAfterMicrosoftCommonTargets={targetsFile}\"",
+                $"\"/p:CustomAfterMicrosoftCommonCrossTargetingTargets={targetsFile}\""
+            };
+
+            var process = new Process
+            {
+                StartInfo = new ProcessStartInfo
+                {
+                    FileName = "dotnet",
+                    Arguments = string.Join(" ", arguments),
+                    RedirectStandardOutput = true,
+                    RedirectStandardError = true,
+                    UseShellExecute = false,
+                    CreateNoWindow = true
+                }
+            };
+
+            process.Start();
+            string output = process.StandardOutput.ReadToEnd();
+            process.WaitForExit();
 
-            var element = xdoc.XPathSelectElement("//PropertyGroup/TargetFramework");
-            return element?.Value;
+            if (process.ExitCode != 0)
+            {
+                throw new Exception($"MSBuild process exited with code {process.ExitCode}. See log for details.");
+            }
+
+            if (File.Exists(outputFile))
+            {
+                var targetFrameworks = File.ReadAllLines(outputFile);
+                File.Delete(outputFile); // Clean up the temporary file
+
+                if (targetFrameworks.Length > 0)
+                {
+                    return targetFrameworks[0]; // Return the first framework if there are multiple
+                }
+            }
+
+            return null;
         }
 
+
+        private static string FindTargetsFile()
+        {
+            var assemblyDir = Path.GetDirectoryName(typeof(DotNetCLIWrapper).Assembly.Location);
+            var searchPaths = new[]
+            {
+                Path.Combine(AppContext.BaseDirectory, "Assets"),
+                Path.Combine(assemblyDir, "Assets"),
+                AppContext.BaseDirectory,
+                assemblyDir,
+            };
+
+            return searchPaths.Select(p => Path.Combine(p, "AmazonCommonDotNetCliTools.targets")).FirstOrDefault(File.Exists);
+        }
+
+
         /// <summary>
         /// Retrieve the `OutputType` property of a given project
         /// </summary>