//download the specified version of the package and update project reference to it. The newly downloaded package //will be located in /packages folder. The updated project reference can be checked in corresponding .csproj file. public bool Execute(string packageid, string projectFile, SemanticVersion version, string packages) { try { System.Console.WriteLine("-------------------------------------"); System.Console.WriteLine("Project File " + projectFile); System.Console.WriteLine("Package "+packageid); System.Console.WriteLine("Version "+version); IPackageRepository repo = PackageRepositoryFactory.Default.CreateRepository("https://packages.nuget.org/api/v2"); var packagePathResolver = new DefaultPackagePathResolver(packages); var packagesFolderFileSystem = new PhysicalFileSystem(packages); var projectSystem = new MSBuildProjectSystem(projectFile); var localRepository = new LocalPackageRepository(packagePathResolver, packagesFolderFileSystem); var projectManager = new ProjectManager(repo, packagePathResolver, projectSystem, localRepository); projectManager.RemovePackageReference(packageid,true,false); projectManager.AddPackageReference(packageid, version, true, false); projectSystem.Save(); string filename = packageid + "." + version; string[] s = Directory.GetFiles(packages+ @"\"+filename); if (s.IsEmpty()) { System.Console.WriteLine("empty"); } else { var nupkgFile = new PhysicalFileSystem(s[0]); ZipPackage z = new ZipPackage(s[0]); z.ExtractContents(nupkgFile, packages + @"\" + filename); } System.Console.WriteLine("Successfully updated"); return true; } catch (Exception e) { System.Console.Write("failure"); System.Console.Write(e.StackTrace); return false; } }