NuGet product used: Nuget Libraries
NuGet version (5.7.0:
VS version: VS 2017
OS version: Win 10 (1909)
Details about Problem
I'm working on a plug-in management system built on top of Nuget similar to Chocolatey, PowerShell Gallery etc. I wanted to use the newer V3 libraries but the amount of abstraction and the lack of documentation is becoming a serious challenge for me.
The responses to issue #6161 have been helpful, as well as the blog posts mentioned there. However, I'm still failing to get simple prototype working that will download and extract a package.
private static void Main(string[] args)
{
try
{
var curDir = System.IO.Directory.GetCurrentDirectory();
ISettings settings = Settings.LoadSpecificSettings(curDir, Settings.DefaultSettingsFileName);
List<Lazy<INuGetResourceProvider>> resourceProviders = new List<Lazy<INuGetResourceProvider>>();
resourceProviders.AddRange(NuGet.Protocol.Core.Types.Repository.Provider.GetCoreV3()); // Add v3 API support
IPackageSourceProvider packageSourceProvider = new PackageSourceProvider(settings);
SourceRepositoryProvider sourceRepositoryProvider = new SourceRepositoryProvider(packageSourceProvider, resourceProviders);
string projectRoot = System.IO.Path.GetFullPath("ProjectRoot");
if (!System.IO.Directory.Exists(projectRoot)) System.IO.Directory.CreateDirectory(projectRoot);
FolderNuGetProject nuGetProject = new FolderNuGetProject(projectRoot);
string packagesFolderPath = System.IO.Path.GetFullPath("Packages");
if (!System.IO.Directory.Exists(packagesFolderPath)) System.IO.Directory.CreateDirectory(packagesFolderPath);
NuGetPackageManager packageManager = new NuGetPackageManager(sourceRepositoryProvider, settings, packagesFolderPath)
{
PackagesFolderNuGetProject = nuGetProject
};
bool allowPrereleaseVersions = true;
bool allowUnlisted = true;
DependencyBehavior dependencyBehavior = DependencyBehavior.Lowest;
ResolutionContext resolutionContext = new ResolutionContext(
dependencyBehavior, allowPrereleaseVersions, allowUnlisted, VersionConstraints.None);
INuGetProjectContext projectContext = new ConsoleProjectContext(NullLogger.Instance);
IEnumerable<SourceRepository> primarySourceRepositories = sourceRepositoryProvider.GetRepositories();
//packageIdentity
string packageId = "Newtonsoft.Json";
string packageVersion = "12.0.3";
PackageIdentity packageIdentity = new PackageIdentity(packageId, new NuGet.Versioning.NuGetVersion(packageVersion));
var installPackageAsyncTask = packageManager.InstallPackageAsync(packageManager.PackagesFolderNuGetProject,
packageIdentity, resolutionContext, projectContext,
primarySourceRepositories, Array.Empty<SourceRepository>(), CancellationToken.None);
installPackageAsyncTask.GetAwaiter().GetResult();
}
catch (Exception exp)
{
using (var sw = new System.IO.StreamWriter("error.txt"))
{
sw.Write(exp.ToString());
}
Console.WriteLine(exp.ToString());
throw;
}
}
And here's the NullReferenceException that is thrown at the end when I try to call InstallPackageAsync()
System.NullReferenceException: Object reference not set to an instance of an object.
at NuGet.ProjectManagement.FolderNuGetProject.<>c__DisplayClass13_0.<<InstallPackageAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at NuGet.Common.ConcurrencyUtilities.<ExecuteWithFileLockedAsync>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at NuGet.Common.ConcurrencyUtilities.<ExecuteWithFileLockedAsync>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at NuGet.PackageManagement.NuGetPackageManager.<ExecuteInstallAsync>d__85.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__76.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__76.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at NuGet.PackageManagement.NuGetPackageManager.<ExecuteNuGetProjectActionsAsync>d__76.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at NuGet.PackageManagement.NuGetPackageManager.<InstallPackageAsync>d__48.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at NuGet.PackageManagement.NuGetPackageManager.<InstallPackageAsync>d__47.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at NugetTest.Program.Main(String[] args) in C:\Git\5ec64809061464dc19a1d4e39961c565\NugetTest\Program.cs:line 66
NuGet product used: Nuget Libraries NuGet version (5.7.0: VS version: VS 2017 OS version: Win 10 (1909)
Details about Problem
I'm working on a plug-in management system built on top of Nuget similar to Chocolatey, PowerShell Gallery etc. I wanted to use the newer V3 libraries but the amount of abstraction and the lack of documentation is becoming a serious challenge for me.
The responses to issue #6161 have been helpful, as well as the blog posts mentioned there. However, I'm still failing to get simple prototype working that will download and extract a package.
Here's my test code https://github.com/ericanastas/nuget-packagemanagment-test
And here's the
NullReferenceException
that is thrown at the end when I try to callInstallPackageAsync()
What am I missing here?