Bug 26205 - System.IO.Package.LoadRelationships throws null reference for some NuGet packages with PCLs generated on Windows
Summary: System.IO.Package.LoadRelationships throws null reference for some NuGet pack...
Alias: None
Product: Class Libraries
Classification: Mono
Component: WindowsBase ()
Version: 3.12.0
Hardware: PC Mac OS
: --- normal
Target Milestone: 4.0.3 (C5SR3)
Assignee: João Matos
Depends on:
Reported: 2015-01-20 12:30 UTC by Matt Ward
Modified: 2015-07-20 02:22 UTC (History)
6 users (show)

Is this bug a regression?: ---
Last known good build:

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.

Please create a new report on GitHub or Developer Community with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:

Description Matt Ward 2015-01-20 12:30:56 UTC
Trying to retrieve the relationships from certain NuGet packages (such as Mono.Data.Sqlite.Portable v1.0.3.3) throws a null reference exception.

'NuGet pack my.nuspec' on Windows will generate directories for PCLs that have the dashes replaced with %2B which seem to be the cause of the null reference exception on Mono. If the %2B parts are replaced with the dash character then the exception does not occur. Also if you remove the Xamarin frameworks from the directory but leave the %2B parts the exception also does not occur. So a NuGet package with a directory of the following would fail:


But one with the following would work:


To reproduce:

Sample NUnit test project to reproduce the problem:


public class PackageTest
	Stream OpenNuGetPackage ()
		string directory = Path.GetDirectoryName (typeof(PackageTest).Assembly.Location);
		string fileName = Path.Combine (directory, "Mono.Data.Sqlite.Portable.");
		return File.OpenRead (fileName);

	internal const string PackageRelationshipNamespace = "http://schemas.microsoft.com/packaging/2010/07/";
	internal const string ManifestRelationType = "manifest";

	public void GetRelationshipsByTypeFromNuGetPackage()
		using (Stream stream = OpenNuGetPackage ()) {
			Package package = Package.Open (stream);
			PackageRelationship relationshipType = package.GetRelationshipsByType (
				PackageRelationshipNamespace + ManifestRelationType).SingleOrDefault ();

			Assert.AreEqual ("/Mono.Data.Sqlite.Portable.nuspec", relationshipType.TargetUri.ToString ());

The above test works on Windows.

Running it on 3.12.0 ((detached/a813491 Thu Dec 11 12:24:44 EST 2014) it fails with:

1) MonoPackageGetRelationshipsByTypeTest.PackageTest.GetRelationshipsByTypeFromNuGetPackage : System.NullReferenceException : Object reference not set to an instance of an object
at System.IO.Packaging.Package.LoadRelationships () [0x001e9] in /private/tmp/source-mono-mac-3.12.0-branch-32/bockbuild-mono-3.12.0-branch/profiles/mono-mac-xamarin/build-root/mono-3.12.0/mcs/class/WindowsBase/System.IO.Packaging/Package.cs:338
at System.IO.Packaging.Package.get_Relationships () [0x0000b] in /private/tmp/source-mono-mac-3.12.0-branch-32/bockbuild-mono-3.12.0-branch/profiles/mono-mac-xamarin/build-root/mono-3.12.0/mcs/class/WindowsBase/System.IO.Packaging/Package.cs:86
at System.IO.Packaging.Package.GetRelationshipsByType (System.String relationshipType) [0x00006] in /private/tmp/source-mono-mac-3.12.0-branch-32/bockbuild-mono-3.12.0-branch/profiles/mono-mac-xamarin/build-root/mono-3.12.0/mcs/class/WindowsBase/System.IO.Packaging/Package.cs:293
at MonoPackageGetRelationshipsByTypeTest.PackageTest.GetRelationshipsByTypeFromNuGetPackage () [0x00016] in tests/MonoPackageGetRelationshipsByTypeTest/src/PackageTest.cs:53
Comment 1 Rodrigo Kumpera 2015-06-16 14:21:53 UTC
Hey João,

Can you work on this one? It would be nice to get this fix on stable 4.0 too as it affects Xamarin.Forms.
Comment 2 João Matos 2015-06-16 14:29:23 UTC
Comment 3 Shruti 2015-06-30 06:17:02 UTC
First, I have reproduced this issue with Mono via following steps given in comment 0. Please refer to the screencast for the same: http://www.screencast.com/t/rUDtFS9CJa5q

Then, I have verified this issue with master mono Test case written in comment(0) is passed. Please refer to the screencast regarding same: http://www.screencast.com/t/afhydQi6ko

Environment Info:
=== Xamarin Studio ===

Version 5.9.4 (build 5)
Installation UUID: 67eaf3b4-f8a7-4ab4-a9df-3197350ca5dc
	Mono 4.3.0 (master/2221dfc)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 403000328

=== Apple Developer Tools ===

Xcode 6.3 (7569)
Build 6D570

=== Xamarin.iOS ===

Version: (Enterprise Edition)
Hash: 4e8928a
Branch: master
Build date: 2015-06-29 11:03:42-0400

=== Xamarin.Mac ===

Version: (Enterprise Edition)

=== Build Information ===

Release ID: 509040005
Git revision: 6a0d9705ef8f73ff262c40692bda63b0c622f824
Build date: 2015-06-15 09:53:12-04
Xamarin addins: 7e93e9c3503f28770f23ce1b7eafd829919f18e8

=== Operating System ===

Mac OS X 10.10.3
Darwin XamnewiMac.local 14.3.0 Darwin Kernel Version 14.3.0
    Mon Mar 23 11:59:05 PDT 2015
    root:xnu-2782.20.48~5/RELEASE_X86_64 x86_64
Comment 4 Shruti 2015-07-20 02:22:21 UTC
This issue is working fine with C5SR3 MonoFramework-MDK-