Fixed a case where exceptions were thrown in the constructors. Fixes #482

- only dispose the list if the list was actually created
 - sign the tests so we can use InternalsVisibleTo
 - added a test to identify #482

binding/Binding/Properties/SkiaSharpAssemblyInfo.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Reflection;
 using System.Resources;
+using System.Runtime.CompilerServices;
 
 [assembly: AssemblyTitle("SkiaSharp")]
 [assembly: AssemblyDescription("SkiaSharp is a cross-platform 2D graphics API for .NET platforms that can be used across mobile, server and desktop models to render images.")]
@@ -14,3 +15,10 @@ using System.Resources;
 #else
 [assembly: AssemblyConfiguration("Release")]
 #endif
+
+[assembly: InternalsVisibleTo("SkiaSharp.Tests, PublicKey=" +
+	"002400000480000094000000060200000024000052534131000400000100010079159977d2d03a" +
+	"8e6bea7a2e74e8d1afcc93e8851974952bb480a12c9134474d04062447c37e0e68c080536fcf3c" +
+	"3fbe2ff9c979ce998475e506e8ce82dd5b0f350dc10e93bf2eeecf874b24770c5081dbea7447fd" +
+	"dafa277b22de47d6ffea449674a4f9fccf84d15069089380284dbdd35f46cdff12a1bd78e4ef00" +
+	"65d016df")]

binding/Binding/SKObject.cs

@@ -61,13 +61,16 @@ namespace SkiaSharp
 
 		protected override void Dispose(bool disposing)
 		{
-			lock (ownedObjects)
+			if (ownedObjects != null)
 			{
-				foreach (var child in ownedObjects)
+				lock (ownedObjects)
 				{
-					child.Dispose();
+					foreach (var child in ownedObjects)
+					{
+						child.Dispose();
+					}
+					ownedObjects.Clear();
 				}
-				ownedObjects.Clear();
 			}
 
 			var zero = DeregisterHandle(Handle, this);

source/SkiaSharp.Build.targets

@@ -46,7 +46,7 @@
     Generate the assembly versioning attributes.
     ===================================================================================================================
   -->
-  <Target Name="_GenerateAssemblyVersionInfo" BeforeTargets="CoreCompile">
+  <Target Name="_GenerateAssemblyVersionInfo" BeforeTargets="CoreCompile" Condition=" '$(SkipGenerateAssemblyVersionInfo)' != 'true' ">
     <PropertyGroup>
       <_VersionSourceFile>$(IntermediateOutputPath)\$(AssemblyName).Version.cs</_VersionSourceFile>
       <_VersionTxtFile>$(MSBuildThisFileDirectory)..\VERSIONS.txt</_VersionTxtFile>
@@ -90,7 +90,7 @@
     Copy the project output into the root output folder.
     ===================================================================================================================
   -->
-  <Target Name="_CopyToOutputDirectory" AfterTargets="Build">
+  <Target Name="_CopyToOutputDirectory" AfterTargets="Build" Condition=" '$(SkipCopyToOutputDirectory)' != 'true' ">
     <ItemGroup Condition=" '$(PackagingLocation)' == '' ">
       <_CopyItems Include="$(TargetPath)" Dest="nuget\lib\$(PackagingPlatform)\$(TargetFileName)" />
       <_CopyItems Include="$(TargetDir)$(TargetName).xml" Dest="nuget\lib\$(PackagingPlatform)\$(TargetName).xml" Condition=" Exists('$(TargetDir)$(TargetName).xml') " />
@@ -119,7 +119,7 @@
     This runs during the build phase.
     ===================================================================================================================
   -->
-  <Target Name="MDocGenerateDocs" AfterTargets="CoreCompile">
+  <Target Name="MDocGenerateDocs" AfterTargets="CoreCompile" Condition=" '$(SkipMDocGenerateDocs)' != 'true' ">
     <PropertyGroup>
       <MDocVersion Condition=" '%(Identity)' == 'mdoc' ">@(PackageReference -> '%(Version)')</MDocVersion>
       <MDocPackagePath Condition=" '%(Name)' == 'mdoc' ">@(PackageDefinitions -> '%(ResolvedPath)')</MDocPackagePath>

tests/SkiaSharp.Desktop.Tests/SkiaSharp.Desktop.Tests.csproj

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\source\SkiaSharp.Build.props" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
@@ -8,7 +9,10 @@
     <RootNamespace>SkiaSharp.Tests</RootNamespace>
     <AssemblyName>SkiaSharp.Tests</AssemblyName>
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
-    <ShouldIncludeNativeSkiaSharp>True</ShouldIncludeNativeSkiaSharp>
+    <ShouldIncludeNativeSkiaSharp>true</ShouldIncludeNativeSkiaSharp>
+    <SkipGenerateAssemblyVersionInfo>true</SkipGenerateAssemblyVersionInfo>
+    <SkipMDocGenerateDocs>true</SkipMDocGenerateDocs>
+    <SkipCopyToOutputDirectory>true</SkipCopyToOutputDirectory>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -121,7 +125,11 @@
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </Content>
   </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+  </ItemGroup>
   <Import Project="..\..\output\SkiaSharp\nuget\build\net45\SkiaSharp.targets" Condition="Exists('..\..\output\SkiaSharp\nuget\build\net45\SkiaSharp.targets')" />
   <Import Project="..\..\output\HarfBuzzSharp\nuget\build\net45\HarfBuzzSharp.targets" Condition="Exists('..\..\output\HarfBuzzSharp\nuget\build\net45\HarfBuzzSharp.targets')" />
+  <Import Project="..\..\source\SkiaSharp.Build.targets" />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>

tests/SkiaSharp.NetCore.Tests/SkiaSharp.NetCore.Tests.csproj

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\..\source\SkiaSharp.Build.props" />
   <PropertyGroup>
     <TargetFramework>netcoreapp2.0</TargetFramework>
     <DefineConstants>$(DefineConstants);NET_STANDARD</DefineConstants>
@@ -11,6 +12,9 @@
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
     <RuntimeIdentifiers>win7-x64;win7-x86;osx.10.10-x64;osx.10.11-x64;ubuntu.14.04-x64;ubuntu.14.10-x64;ubuntu.16.04-x64;ubuntu.16.10-x64</RuntimeIdentifiers>
     <RuntimeFrameworkVersion>2.0.0</RuntimeFrameworkVersion>
+    <SkipGenerateAssemblyVersionInfo>true</SkipGenerateAssemblyVersionInfo>
+    <SkipMDocGenerateDocs>true</SkipMDocGenerateDocs>
+    <SkipCopyToOutputDirectory>true</SkipCopyToOutputDirectory>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="xunit" Version="2.4.0-beta.1.build3958" />
@@ -36,4 +40,5 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
+  <Import Project="..\..\source\SkiaSharp.Build.targets" />
 </Project>

tests/Tests/SKApiTests.cs

@@ -136,5 +136,45 @@ namespace SkiaSharp.Tests
 				}
 			}
 		}
+
+		[SkippableFact]
+		public void ExceptionsThrownInTheConstructorFailGracefully()
+		{
+			BrokenObject broken = null;
+			try
+			{
+				broken = new BrokenObject();
+			}
+			catch (Exception)
+			{
+			}
+			finally
+			{
+				broken?.Dispose();
+				broken = null;
+			}
+
+			// try and trigger the finalizer
+			GC.Collect();
+			GC.WaitForPendingFinalizers();
+		}
+
+		private class BrokenObject : SKObject
+		{
+			public BrokenObject()
+				: base(broken_native_method(), true)
+			{
+			}
+
+			private static IntPtr broken_native_method()
+			{
+				throw new Exception("BREAK!");
+			}
+
+			protected override void Dispose(bool disposing)
+			{
+				base.Dispose(disposing);
+			}
+		}
 	}
 }