Use msbuild to get the obj folder path (#11)

.gitignore

@@ -348,3 +348,6 @@ MigrationBackup/
 
 # Ionide (cross platform F# VS Code tools) working folder
 .ionide/
+
+# We don't need the runsettings
+launchSettings.json

Directory.Packages.props

@@ -14,6 +14,9 @@
 		<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
 		<PackageVersion Include="xunit" Version="2.4.1" />
 		<PackageVersion Include="xunit.runner.visualstudio" Version="2.4.3" />
+		<PackageVersion Include="Microsoft.Build" Version="17.3.1" />
+		<PackageVersion Include="Microsoft.Build.Locator" Version="1.5.5" />
+		<PackageVersion Include="Microsoft.Build.Framework" Version="17.3.1" />
 	</ItemGroup>
 
 

src/Common/PackageDependencyNode.cs

@@ -1,5 +1,4 @@
-using NuGet.Packaging.Core;
-using NuGet.Versioning;
+using NuGet.Versioning;
 using System.Diagnostics;
 
 namespace Common

src/DependencyVisualizerTool/DependencyVisualizerTool.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
 		<OutputType>Exe</OutputType>
@@ -15,6 +15,9 @@
 
 	<ItemGroup>
 		<PackageReference Include="System.CommandLine" />
+		<PackageReference Include="Microsoft.Build" ExcludeAssets="runtime" />
+		<PackageReference Include="Microsoft.Build.Framework" ExcludeAssets="runtime" />
+		<PackageReference Include="Microsoft.Build.Locator" />
 	</ItemGroup>
 
 	<ItemGroup>

src/DependencyVisualizerTool/MSBuildUtility.cs

@@ -0,0 +1,32 @@
+using Microsoft.Build.Construction;
+using Microsoft.Build.Evaluation;
+using Microsoft.Build.Exceptions;
+using System.Globalization;
+
+namespace DependencyVisualizerTool
+{
+    internal class MSBuildUtility
+    {
+        private const string MSBuildProjectExtensionsPath = nameof(MSBuildProjectExtensionsPath);
+
+        public static string GetMSBuildProjectExtensionsPath(string projectFilePath)
+        {
+            var project = GetProject(projectFilePath);
+            return project.GetPropertyValue(MSBuildProjectExtensionsPath);
+        }
+
+        private static Project GetProject(string projectCSProjPath, IDictionary<string, string>? globalProperties = null)
+        {
+            try
+            {
+                var projectRootElement = ProjectRootElement.Open(projectCSProjPath, ProjectCollection.GlobalProjectCollection, preserveFormatting: true);
+                return new Project(projectRootElement);
+            }
+            catch (InvalidProjectFileException e)
+            {
+                throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, "Unable to open the project {0}", projectCSProjPath), e);
+            }
+        }
+
+    }
+}

src/DependencyVisualizerTool/Program.cs

@@ -1,6 +1,9 @@
 // See https://aka.ms/new-console-template for more information
+using Microsoft.Build.Locator;
 using System.CommandLine;
 
+MSBuildLocator.RegisterDefaults();
+
 var fileArgument = new Argument<FileInfo?>(
     name: "assetsFile",
     description: "The file to read and display on the console.",