NuGet.UnzippedPackage.EnsureManifest C# (CSharp) Method

        private void EnsureManifest()
        {
            // we look for the .nuspec file at jQuery.1.4\jQuery.1.4.nuspec
            string manifestFile = Path.Combine(_packageName, _packageName + Constants.ManifestExtension);
            if (!_repositoryFileSystem.FileExists(manifestFile))
            {
                throw new InvalidOperationException(
                    String.Format(CultureInfo.CurrentCulture, NuGetResources.Manifest_NotFound, _repositoryFileSystem.GetFullPath(manifestFile)));
            }

            using (Stream manifestStream = _repositoryFileSystem.OpenFile(manifestFile))
            {
                ReadManifest(manifestStream);
            }
        }
    }