Xaml empty service provider (#736)

* [Xaml] AcceptEmptyServiceProvider

* [XamlC] AcceptEmptyServiceProvider

* docs

3 files changed, 74 insertions, 0 deletions

diff --git a/Xamarin.Forms.Xaml.UnitTests/AcceptEmptyServiceProvider.xaml b/Xamarin.Forms.Xaml.UnitTests/AcceptEmptyServiceProvider.xaml
new file mode 100644
index 00000000..b39bd287
--- /dev/null
+++ b/Xamarin.Forms.Xaml.UnitTests/AcceptEmptyServiceProvider.xaml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+	xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+	xmlns:local="clr-namespace:Xamarin.Forms.Xaml.UnitTests"
+	x:Class="Xamarin.Forms.Xaml.UnitTests.AcceptEmptyServiceProvider" ServiceProvider="{local:Foo}">
+</ContentPage>
\ No newline at end of file
diff --git a/Xamarin.Forms.Xaml.UnitTests/AcceptEmptyServiceProvider.xaml.cs b/Xamarin.Forms.Xaml.UnitTests/AcceptEmptyServiceProvider.xaml.cs
new file mode 100644
index 00000000..611cb36e
--- /dev/null
+++ b/Xamarin.Forms.Xaml.UnitTests/AcceptEmptyServiceProvider.xaml.cs
@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using NUnit.Framework;
+using Xamarin.Forms;
+using Xamarin.Forms.Core.UnitTests;
+
+namespace Xamarin.Forms.Xaml.UnitTests
+{
+	[AcceptEmptyServiceProvider]
+	public class FooExtension : IMarkupExtension<IServiceProvider>
+	{
+		public IServiceProvider ProvideValue(IServiceProvider serviceProvider)
+		{
+			return serviceProvider;
+		}
+
+		object IMarkupExtension.ProvideValue(IServiceProvider serviceProvider)
+		{
+			return (this as IMarkupExtension<IServiceProvider>).ProvideValue(serviceProvider);
+		}
+	}
+
+	public partial class AcceptEmptyServiceProvider : ContentPage
+	{
+		public AcceptEmptyServiceProvider()
+		{
+			InitializeComponent();
+		}
+
+		public AcceptEmptyServiceProvider(bool useCompiledXaml)
+		{
+			//this stub will be replaced at compile time
+		}
+
+		public IServiceProvider ServiceProvider { get; set; }
+
+		[TestFixture]
+		class Tests
+		{
+			[SetUp]
+			public void Setup()
+			{
+				Device.PlatformServices = new MockPlatformServices();
+			}
+
+			[TearDown]
+			public void TearDown()
+			{
+				Device.PlatformServices = null;
+			}
+
+			[TestCase(true)]
+			[TestCase(false)]
+			public void ServiceProviderIsNullOnAttributedExtensions(bool useCompiledXaml)
+			{
+				var p = new AcceptEmptyServiceProvider(useCompiledXaml);
+				Assert.IsNull(p.ServiceProvider);
+			}
+		}
+	}
+}
diff --git a/Xamarin.Forms.Xaml.UnitTests/Xamarin.Forms.Xaml.UnitTests.csproj b/Xamarin.Forms.Xaml.UnitTests/Xamarin.Forms.Xaml.UnitTests.csproj
index 4b3e5c86..90bab284 100644
--- a/Xamarin.Forms.Xaml.UnitTests/Xamarin.Forms.Xaml.UnitTests.csproj
+++ b/Xamarin.Forms.Xaml.UnitTests/Xamarin.Forms.Xaml.UnitTests.csproj
@@ -441,6 +441,10 @@
     </Compile>
     <Compile Include="Issues\Bz44216.xaml.cs">
       <DependentUpon>Bz44216.xaml</DependentUpon>
+      <DependentUpon>AcceptEmptyServiceProvider.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="AcceptEmptyServiceProvider.xaml.cs">
+      <DependentUpon>AcceptEmptyServiceProvider.xaml</DependentUpon>
     </Compile>
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
@@ -805,6 +809,9 @@
     <EmbeddedResource Include="Issues\Bz44216.xaml">
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
     </EmbeddedResource>
+    <EmbeddedResource Include="AcceptEmptyServiceProvider.xaml">
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
     <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />