以程序方式为本地存储库创建NuGet包

我正在编写一个控制台应用程序来创建NuGet包（使用NuGet.Core库），该包将托管在我们的内部服务器上，并部署到我们的应用程序中。当我们使用NuGet包资源管理器手动创建包时，这一切都很好，但我们现在需要自动化这个过程。

我把下面的代码拼凑在一起，以自动构建包，但我在builder.Populate(packageMetadata); 行上遇到了一个错误

错误为：

Value cannot be null.
Parameter name: source

这是堆栈跟踪：

at System.Linq.Enumerable.Select[TSource,TResult](IEnumerable`1 source, Func`2 selector)
at NuGet.PackageBuilder.Populate(ManifestMetadata manifestMetadata)
at BuildPackage.Create(String packageName, String path, String description) in c:'Source Code'Visual Studio Projects'Tools'Console Applications'NuGet Package Builder'BuildPackage.cs:line 134

我已经看了NuGet的源代码（见这里），但我不知道是什么导致了它

关于以下代码的一些注意事项：

• 前两个区域只是为了计算新包的版本号，您可以忽略它们
• ReferencePaths.NuGetPackages是本地NuGet存储库路径的静态字符串
• 这段代码使用提供的packageName和路径获取构建的DLL和PDB文件

这是代码：

class BuildPackage
{
    public static void Create(string packageName, string path, string description)
    {
        try
        {
            #region Get the current package version
            int major = 0;
            int minor = 0;
            int packageNo = 0;
            List<string> files = Directory.EnumerateFiles(ReferencePaths.NuGetPackages, packageName + "*").ToList();
            if (files.Count > 0)
            {
                foreach (string file in files)
                {
                    string[] versions = file.Replace(ReferencePaths.NuGetPackages, "").Replace(packageName + ".", "").Replace(".nupkg", "").Split('.');
                    int newMajor = Convert.ToInt32(versions[0]);
                    int newMinor = Convert.ToInt32(versions[1]);
                    int newPackageNo = Convert.ToInt32(versions[2]);
                    // Figure out if this is the latest package
                    if (newMajor > major ||
                        (newMajor == major && newMinor > minor) ||
                        (newMajor == major && newMinor == minor && newPackageNo > packageNo))
                    {
                        major = newMajor;
                        minor = newMinor;
                        packageNo = newPackageNo;
                    }
                }
            }
            #endregion Get the current package version
            #region Get the new assembly version
            FileVersionInfo version = FileVersionInfo.GetVersionInfo(path + packageName + ".dll");
            if (version.FileMajorPart > major ||
                (version.FileMajorPart == major && version.FileMinorPart > minor))
            {
                major = version.FileMajorPart;
                minor = version.FileMinorPart;
                packageNo = 0;
            }
            else
            {
                while (File.Exists(ReferencePaths.NuGetPackages + packageName + "." + major.ToString() + "." + minor.ToString() + "." + packageNo.ToString() + ".nupkg"))
                {
                    packageNo++;
                }
            }
            #endregion Get the new assembly version
            #region Create the package
            string packageVersion = major.ToString() + "." + minor.ToString() + "." + packageNo.ToString();
            string newPackageName = packageName + "." + packageVersion + ".nupkg";
            ManifestMetadata packageMetadata = new ManifestMetadata();
            packageMetadata.Id = packageName;
            packageMetadata.Version = packageVersion;
            packageMetadata.Authors = "Test";
            packageMetadata.Description = description;
            List<ManifestFile> manifestFiles = new List<ManifestFile>();
            ManifestFile dllFile = new ManifestFile();
            dllFile.Source = packageName + ".dll";
            dllFile.Target = @"lib'" + packageName + ".dll";
            manifestFiles.Add(dllFile);
            ManifestFile pdbFile = new ManifestFile();
            pdbFile.Source = packageName + ".pdb";
            pdbFile.Target = @"lib'" + packageName + ".pdb";
            manifestFiles.Add(pdbFile); 
            PackageBuilder builder = new PackageBuilder();
            builder.PopulateFiles(path, manifestFiles);
            builder.Populate(packageMetadata);
            using (FileStream stream = File.Open(ReferencePaths.NuGetPackages + newPackageName, FileMode.OpenOrCreate))
            {
                builder.Save(stream);
            }
            #endregion Create the package
            Console.WriteLine("New package created: " + newPackageName);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
}

有人知道可能出了什么问题吗？我需要ManifestMetadata中的更多信息吗？我试着填写我能想到的所有房产，但无济于事。