Clean up depprojs

Remove depprojs that were being used for old references/API-compat

For any project mentioning depproj, remove reference and clean up any
Configurations we don't expect to build

24 files changed, 13 insertions, 247 deletions

diff --git a/src/System.AppContext/ref/4.0.0/System.AppContext.depproj b/src/System.AppContext/ref/4.0.0/System.AppContext.depproj
deleted file mode 100644
index 4a6bfcac64..0000000000
--- a/src/System.AppContext/ref/4.0.0/System.AppContext.depproj
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
-  <PropertyGroup>
-    <AssemblyVersion>4.0.0.0</AssemblyVersion>
-    <OutputType>Library</OutputType>
-    <NuGetTargetMoniker>.NETStandard,Version=v1.3</NuGetTargetMoniker>
-  </PropertyGroup>
-  <ItemGroup>
-    <None Include="project.json" />
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
diff --git a/src/System.AppContext/src/System.AppContext.csproj b/src/System.AppContext/src/System.AppContext.csproj
index 3b8d4c7fca..d3cd65531d 100644
--- a/src/System.AppContext/src/System.AppContext.csproj
+++ b/src/System.AppContext/src/System.AppContext.csproj
@@ -6,7 +6,6 @@
     <ProjectGuid>{5522BAFC-E2FF-4896-993A-401DDEDFD85F}</ProjectGuid>
     <ClsCompliant>true</ClsCompliant>
     <IsPartialFacadeAssembly Condition="'$(TargetGroup)'!='netcore50aot'">true</IsPartialFacadeAssembly>
-    <ContractProject Condition="'$(TargetGroup)'=='netcore50'">..\ref\4.0.0\System.AppContext.depproj</ContractProject>
     <!-- The following line needs to be removed once we have a targeting pack for 4.6.3 -->
     <TargetingPackNugetPackageId Condition="'$(TargetGroup)'=='net463'">Microsoft.TargetingPack.NETFramework.v4.6.2</TargetingPackNugetPackageId>
     <ExcludeResourcesImport Condition="'$(IsPartialFacadeAssembly)'=='true'">true</ExcludeResourcesImport>
diff --git a/src/System.Console/ref/4.0.0/System.Console.depproj b/src/System.Console/ref/4.0.0/System.Console.depproj
deleted file mode 100644
index 2e7ae1ef78..0000000000
--- a/src/System.Console/ref/4.0.0/System.Console.depproj
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
-  <PropertyGroup>
-    <AssemblyVersion>4.0.0.0</AssemblyVersion>
-    <OutputType>Library</OutputType>
-    <PackageTargetFramework>netstandard1.3</PackageTargetFramework>
-    <NuGetTargetMoniker>.NETStandard,Version=v1.3</NuGetTargetMoniker>
-  </PropertyGroup>
-  <ItemGroup>
-    <None Include="project.json" />
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
diff --git a/src/System.IO.Compression/src/System.IO.Compression.csproj b/src/System.IO.Compression/src/System.IO.Compression.csproj
index e77d4c9555..4638562157 100644
--- a/src/System.IO.Compression/src/System.IO.Compression.csproj
+++ b/src/System.IO.Compression/src/System.IO.Compression.csproj
@@ -3,23 +3,21 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <PropertyGroup>
     <AssemblyName>System.IO.Compression</AssemblyName>
-    <AssemblyVersion Condition="'$(TargetGroup)'=='netstandard1.3' OR '$(TargetGroup)'=='net46'">4.1.2.0</AssemblyVersion>
-    <ContractProject Condition="'$(AssemblyVersion)'=='4.1.2.0'">../ref/4.1.0/System.IO.Compression.depproj</ContractProject>
     <OutputType>Library</OutputType>
     <ProjectGuid>{5471BFE8-8071-466F-838E-5ADAA779E742}</ProjectGuid>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <UseECMAKey>true</UseECMAKey>
     <DefineConstants Condition="'$(TargetGroup)' == 'netstandard'">$(DefineConstants);FEATURE_ZLIB</DefineConstants>
-    <DefineConstants Condition="'$(AssemblyVersion)'!='4.1.2.0'">$(DefineConstants);netstandard17</DefineConstants>
-    <IsPartialFacadeAssembly Condition="'$(TargetGroup)' == 'net46' Or '$(TargetGroup)' == 'net463'">true</IsPartialFacadeAssembly>
+    <DefineConstants>$(DefineConstants);netstandard20</DefineConstants>
+    <IsPartialFacadeAssembly Condition="'$(TargetGroup)' == 'net46'">true</IsPartialFacadeAssembly>
   </PropertyGroup>
   <!-- Default configurations to help VS understand the options -->
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard-Unix-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard-Unix-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard-Windows_NT-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard-Windows_NT-Release|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net463-Windows_NT-Debug|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net463-Windows_NT-Release|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net46-Windows_NT-Debug|AnyCPU'" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net46-Windows_NT-Release|AnyCPU'" />
   <!-- Files shared between net46 and core -->
   <ItemGroup>
     <Compile Include="$(SharedOpenSourcePath)System\IO\Compression\Crc32Helper.cs" />
@@ -103,7 +101,7 @@
     </Compile>
   </ItemGroup>
   <!-- Files exclusive to net46 -->
-  <ItemGroup Condition="'$(TargetGroup)' == 'net46' Or '$(TargetGroup)' == 'net463'">
+  <ItemGroup Condition="'$(TargetGroup)' == 'net46'">
     <Compile Include="AssemblyInfo.cs" />
     <TargetingPackReference Include="mscorlib" />
     <TargetingPackReference Include="System" />
diff --git a/src/System.IO.Compression/src/System/IO/Compression/DeflateManaged/DeflateManagedStream.cs b/src/System.IO.Compression/src/System/IO/Compression/DeflateManaged/DeflateManagedStream.cs
index 7ea497f5f3..775948314e 100644
--- a/src/System.IO.Compression/src/System/IO/Compression/DeflateManaged/DeflateManagedStream.cs
+++ b/src/System.IO.Compression/src/System/IO/Compression/DeflateManaged/DeflateManagedStream.cs
@@ -292,7 +292,7 @@ namespace System.IO.Compression
             throw new InvalidOperationException(SR.CannotWriteToDeflateStream);
         }
 
-#if netstandard17
+#if netstandard20
         public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback asyncCallback, object asyncState) =>
             TaskToApm.Begin(ReadAsync(buffer, offset, count, CancellationToken.None), asyncCallback, asyncState);
 
diff --git a/src/System.IO.Compression/src/System/IO/Compression/DeflateZLib/DeflateStream.cs b/src/System.IO.Compression/src/System/IO/Compression/DeflateZLib/DeflateStream.cs
index f67bf43352..22c1352bf0 100644
--- a/src/System.IO.Compression/src/System/IO/Compression/DeflateZLib/DeflateStream.cs
+++ b/src/System.IO.Compression/src/System/IO/Compression/DeflateZLib/DeflateStream.cs
@@ -328,7 +328,7 @@ namespace System.IO.Compression
             throw new InvalidOperationException(SR.CannotWriteToDeflateStream);
         }
 
-#if netstandard17
+#if netstandard20
         public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback asyncCallback, object asyncState) =>
             TaskToApm.Begin(ReadAsync(buffer, offset, count, CancellationToken.None), asyncCallback, asyncState);
 
@@ -585,7 +585,7 @@ namespace System.IO.Compression
             }
         }
 
-#if netstandard17
+#if netstandard20
         public override IAsyncResult BeginWrite(byte[] array, int offset, int count, AsyncCallback asyncCallback, object asyncState) =>
             TaskToApm.Begin(WriteAsync(array, offset, count, CancellationToken.None), asyncCallback, asyncState);
 
diff --git a/src/System.IO.Compression/src/System/IO/Compression/GZipStream.cs b/src/System.IO.Compression/src/System/IO/Compression/GZipStream.cs
index e0e3252af7..e97331499f 100644
--- a/src/System.IO.Compression/src/System/IO/Compression/GZipStream.cs
+++ b/src/System.IO.Compression/src/System/IO/Compression/GZipStream.cs
@@ -72,7 +72,7 @@ namespace System.IO.Compression
             return _deflateStream.ReadByte();
         }
 
-#if netstandard17
+#if netstandard20
         public override IAsyncResult BeginRead(byte[] array, int offset, int count, AsyncCallback asyncCallback, object asyncState) =>
             TaskToApm.Begin(WriteAsync(array, offset, count, CancellationToken.None), asyncCallback, asyncState);
 
@@ -86,7 +86,7 @@ namespace System.IO.Compression
             return _deflateStream.Read(array, offset, count);
         }
 
-#if netstandard17
+#if netstandard20
         public override IAsyncResult BeginWrite(byte[] array, int offset, int count, AsyncCallback asyncCallback, object asyncState) =>
             TaskToApm.Begin(WriteAsync(array, offset, count, CancellationToken.None), asyncCallback, asyncState);
 
diff --git a/src/System.IO.FileSystem/ref/4.0.1/System.IO.FileSystem.depproj b/src/System.IO.FileSystem/ref/4.0.1/System.IO.FileSystem.depproj
deleted file mode 100644
index 36b93c3576..0000000000
--- a/src/System.IO.FileSystem/ref/4.0.1/System.IO.FileSystem.depproj
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
-  <PropertyGroup>
-    <AssemblyVersion>4.0.1.0</AssemblyVersion>
-    <OutputType>Library</OutputType>
-    <PackageTargetFramework>netstandard1.3</PackageTargetFramework>
-    <NuGetTargetMoniker>.NETStandard,Version=v1.3</NuGetTargetMoniker>
-  </PropertyGroup>
-  <ItemGroup>
-    <None Include="project.json" />
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
diff --git a/src/System.IO.FileSystem/src/System.IO.FileSystem.csproj b/src/System.IO.FileSystem/src/System.IO.FileSystem.csproj
index 10065d65e7..d48e83c160 100644
--- a/src/System.IO.FileSystem/src/System.IO.FileSystem.csproj
+++ b/src/System.IO.FileSystem/src/System.IO.FileSystem.csproj
@@ -4,11 +4,6 @@
   <PropertyGroup>
     <ProjectGuid>{879C23DC-D828-4DFB-8E92-ABBC11B71035}</ProjectGuid>
     <AssemblyName>System.IO.FileSystem</AssemblyName>
-    <!--
-      Disabling APICompat for the older builds because we are hitting
-      bug https://github.com/dotnet/buildtools/issues/1056
-    -->
-    <RunApiCompat Condition="'$(AssemblyVersion)'=='4.0.2.0'">false</RunApiCompat>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IsPartialFacadeAssembly>true</IsPartialFacadeAssembly>
     <ResourcesSourceOutputDirectory Condition="'$(TargetGroup)' == 'net463'">None</ResourcesSourceOutputDirectory>
diff --git a/src/System.Linq.Expressions/ref/4.1.0/System.Linq.Expressions.depproj b/src/System.Linq.Expressions/ref/4.1.0/System.Linq.Expressions.depproj
deleted file mode 100644
index eb9b218fc4..0000000000
--- a/src/System.Linq.Expressions/ref/4.1.0/System.Linq.Expressions.depproj
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
-  <PropertyGroup>
-    <AssemblyVersion>4.1.0.0</AssemblyVersion>
-    <OutputType>Library</OutputType>
-    <PackageTargetFramework>netstandard1.6</PackageTargetFramework>
-    <NuGetTargetMoniker>.NETStandard,Version=v1.6</NuGetTargetMoniker>
-  </PropertyGroup>
-  <ItemGroup>
-    <None Include="project.json" />
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
diff --git a/src/System.Linq.Expressions/src/System.Linq.Expressions.csproj b/src/System.Linq.Expressions/src/System.Linq.Expressions.csproj
index 089a5d869d..a7aaf933a5 100644
--- a/src/System.Linq.Expressions/src/System.Linq.Expressions.csproj
+++ b/src/System.Linq.Expressions/src/System.Linq.Expressions.csproj
@@ -9,8 +9,6 @@
     <ProjectGuid>{AEF718E9-D4FC-418F-A7AE-ED6B2C7B3787}</ProjectGuid>
     <AssemblyName>System.Linq.Expressions</AssemblyName>
     <RootNamespace>System.Linq.Expressions</RootNamespace>
-    <AssemblyVersion Condition="'$(TargetGroup)'=='netstandard1.6' Or '$(TargetGroup)'=='netstandard1.6'">4.1.1.0</AssemblyVersion>
-    <ContractProject Condition="'$(AssemblyVersion)'=='4.1.1.0'">../ref/4.1.0/System.Linq.Expressions.depproj</ContractProject>
     <IsInterpreting Condition="'$(TargetGroup)' == 'netcore50'">true</IsInterpreting>
     <DefineConstants Condition=" '$(IsInterpreting)' != 'true' ">$(DefineConstants);FEATURE_COMPILE</DefineConstants>
     <DefineConstants Condition=" '$(FeatureInterpret)' == 'true' ">$(DefineConstants);FEATURE_INTERPRET</DefineConstants>
diff --git a/src/System.Net.Sockets/src/System.Net.Sockets.csproj b/src/System.Net.Sockets/src/System.Net.Sockets.csproj
index a0eb2cc415..24710db79c 100644
--- a/src/System.Net.Sockets/src/System.Net.Sockets.csproj
+++ b/src/System.Net.Sockets/src/System.Net.Sockets.csproj
@@ -9,7 +9,6 @@
     <IsPartialFacadeAssembly Condition="'$(TargetGroup)' == 'net463'">true</IsPartialFacadeAssembly>
     <AssemblyVersion Condition="'$(TargetGroup)' == 'netcore50'">4.1.1.0</AssemblyVersion>
     <DefineConstants Condition="'$(TargetGroup)' == 'netcore50'">$(DefineConstants);netcore50</DefineConstants>
-    <ContractProject Condition="'$(AssemblyVersion)'=='4.1.1.0'">../ref/4.1.0/System.Net.Sockets.depproj</ContractProject>
   </PropertyGroup>
   <!-- Help VS understand available configurations -->
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netcore50-Windows_NT-Debug|AnyCPU'" />
diff --git a/src/System.Reflection.Extensions/src/System.Reflection.Extensions.csproj b/src/System.Reflection.Extensions/src/System.Reflection.Extensions.csproj
index 014415b68a..7dfd8ac83c 100644
--- a/src/System.Reflection.Extensions/src/System.Reflection.Extensions.csproj
+++ b/src/System.Reflection.Extensions/src/System.Reflection.Extensions.csproj
@@ -3,8 +3,6 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <PropertyGroup>
     <AssemblyName>System.Reflection.Extensions</AssemblyName>
-    <AssemblyVersion Condition="'$(TargetGroup)'=='netstandard1.3'">4.0.2.0</AssemblyVersion>
-    <ContractProject Condition="'$(AssemblyVersion)'=='4.0.2.0'">..\ref\4.0.0\System.Reflection.Extensions.depproj</ContractProject>
     <IsPartialFacadeAssembly>true</IsPartialFacadeAssembly>
     <!-- all targets but netcore50aot are pure facades. Exclude resources for pure facades -->
     <ExcludeResourcesImport Condition="'$(TargetGroup)'!='netcore50aot'">true</ExcludeResourcesImport>
diff --git a/src/System.Runtime.Extensions/ref/4.1.0/System.Runtime.Extensions.depproj b/src/System.Runtime.Extensions/ref/4.1.0/System.Runtime.Extensions.depproj
deleted file mode 100644
index 1ff7ec1f85..0000000000
--- a/src/System.Runtime.Extensions/ref/4.1.0/System.Runtime.Extensions.depproj
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
-  <PropertyGroup>
-    <AssemblyVersion>4.1.0.0</AssemblyVersion>
-    <OutputType>Library</OutputType>
-    <PackageTargetFramework>netstandard1.5</PackageTargetFramework>
-    <NuGetTargetMoniker>.NETStandard,Version=v1.5</NuGetTargetMoniker>
-  </PropertyGroup>
-  <ItemGroup>
-    <None Include="project.json" />
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
diff --git a/src/System.Runtime.Serialization.Primitives/src/System.Runtime.Serialization.Primitives.csproj b/src/System.Runtime.Serialization.Primitives/src/System.Runtime.Serialization.Primitives.csproj
index 7c64b6494b..892d452bd0 100644
--- a/src/System.Runtime.Serialization.Primitives/src/System.Runtime.Serialization.Primitives.csproj
+++ b/src/System.Runtime.Serialization.Primitives/src/System.Runtime.Serialization.Primitives.csproj
@@ -3,8 +3,6 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <PropertyGroup>
     <AssemblyName>System.Runtime.Serialization.Primitives</AssemblyName>
-    <AssemblyVersion Condition="'$(TargetGroup)'=='netstandard1.3' Or '$(TargetGroup)'=='netcore50aot'">4.1.1.0</AssemblyVersion>
-    <ContractProject Condition="'$(AssemblyVersion)'=='4.1.1.0'">../ref/4.1.1/System.Runtime.Serialization.Primitives.depproj</ContractProject>
     <RootNamespace>System.Runtime.Serialization.Primitives</RootNamespace>
     <NoWarn>$(NoWarn);1634;1691;649</NoWarn>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
@@ -14,12 +12,8 @@
     <IsPartialFacadeAssembly Condition="'$(TargetGroup)'=='net463'">true</IsPartialFacadeAssembly>
   </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netcore50aot-Windows_NT-Debug|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netcore50aot-Windows_NT-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='uap101aot-Windows_NT-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='uap101aot-Windows_NT-Release|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard1.3-Debug|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard1.3-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net463-Windows_NT-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net463-Windows_NT-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard-Debug|AnyCPU'" />
@@ -35,14 +29,6 @@
     <Compile Include="System\Runtime\Serialization\ISerializationSurrogateProvider.cs" />
     <Compile Include="System\Runtime\Serialization\KnownTypeAttribute.cs" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetGroup)'=='netstandard1.3' Or '$(TargetGroup)'=='netcore50aot'">
-    <Compile Include="System\Runtime\Serialization\OnDeserializedAttribute.cs" />
-    <Compile Include="System\Runtime\Serialization\OnDeserializingAttribute.cs" />
-    <Compile Include="System\Runtime\Serialization\OnSerializedAttribute.cs" />
-    <Compile Include="System\Runtime\Serialization\OnSerializingAttribute.cs" />
-    <Compile Include="System\Runtime\Serialization\SerializationException.cs" />
-    <Compile Include="System\Runtime\Serialization\StreamingContext.cs" />
-  </ItemGroup>
   <ItemGroup Condition="'$(TargetGroup)' == 'netstandard' Or '$(TargetGroup)'=='uap101aot'">
     <Compile Include="System\Runtime\Serialization\InvalidDataContractException.Serialization.cs" />
     <Compile Include="System.Runtime.Serialization.Primitives.TypeForwards.cs" />
diff --git a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnDeserializedAttribute.cs b/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnDeserializedAttribute.cs
deleted file mode 100644
index 408a55ccf9..0000000000
--- a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnDeserializedAttribute.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-namespace System.Runtime.Serialization
-{
-    [AttributeUsage(AttributeTargets.Method, Inherited = false)]
-    public sealed class OnDeserializedAttribute : Attribute
-    {
-    }
-}
diff --git a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnDeserializingAttribute.cs b/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnDeserializingAttribute.cs
deleted file mode 100644
index 162857e8d3..0000000000
--- a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnDeserializingAttribute.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-namespace System.Runtime.Serialization
-{
-    [AttributeUsage(AttributeTargets.Method, Inherited = false)]
-    public sealed class OnDeserializingAttribute : Attribute
-    {
-    }
-}
diff --git a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnSerializedAttribute.cs b/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnSerializedAttribute.cs
deleted file mode 100644
index 020dd0257c..0000000000
--- a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnSerializedAttribute.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-namespace System.Runtime.Serialization
-{
-    [AttributeUsage(AttributeTargets.Method, Inherited = false)]
-    public sealed class OnSerializedAttribute : Attribute
-    {
-    }
-}
diff --git a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnSerializingAttribute.cs b/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnSerializingAttribute.cs
deleted file mode 100644
index 8dc8af3f23..0000000000
--- a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/OnSerializingAttribute.cs
+++ /dev/null
@@ -1,11 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-namespace System.Runtime.Serialization
-{
-    [AttributeUsage(AttributeTargets.Method, Inherited = false)]
-    public sealed class OnSerializingAttribute : Attribute
-    {
-    }
-}
diff --git a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/SerializationException.cs b/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/SerializationException.cs
deleted file mode 100644
index d03fac6793..0000000000
--- a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/SerializationException.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-namespace System.Runtime.Serialization
-{
-    public class SerializationException : Exception
-    {
-        private static string s_nullMessage = "Serialization error."; // TODO: SR.SerializationException;
-
-        public SerializationException() : base(s_nullMessage)
-        {
-        }
-
-        public SerializationException(string message) : base(message)
-        {
-        }
-
-        public SerializationException(string message, Exception innerException) : base(message, innerException)
-        {
-        }
-    }
-}
diff --git a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/StreamingContext.cs b/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/StreamingContext.cs
deleted file mode 100644
index 98a622fc68..0000000000
--- a/src/System.Runtime.Serialization.Primitives/src/System/Runtime/Serialization/StreamingContext.cs
+++ /dev/null
@@ -1,53 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-namespace System.Runtime.Serialization
-{
-    public struct StreamingContext
-    {
-        private readonly object _additionalContext;
-        private readonly StreamingContextStates _state;
-
-        public StreamingContext(StreamingContextStates state) : this(state, null)
-        {
-        }
-
-        public StreamingContext(StreamingContextStates state, object additional)
-        {
-            _state = state;
-            _additionalContext = additional;
-        }
-
-        public override bool Equals(object obj)
-        {
-            if (!(obj is StreamingContext))
-            {
-                return false;
-            }
-            StreamingContext ctx = (StreamingContext)obj;
-            return ctx._additionalContext == _additionalContext && ctx._state == _state;
-        }
-
-        public override int GetHashCode() => (int)_state;
-
-        public StreamingContextStates State => _state;
-
-        public object Context => _additionalContext;
-    }
-
-    // Keep these in sync with the version in vm\runtimehandles.h
-    [Flags]
-    public enum StreamingContextStates
-    {
-        CrossProcess = 0x01,
-        CrossMachine = 0x02,
-        File = 0x04,
-        Persistence = 0x08,
-        Remoting = 0x10,
-        Other = 0x20,
-        Clone = 0x40,
-        CrossAppDomain = 0x80,
-        All = 0xFF,
-    }
-}
diff --git a/src/System.Runtime/ref/4.1.0/System.Runtime.depproj b/src/System.Runtime/ref/4.1.0/System.Runtime.depproj
deleted file mode 100644
index e3932a41e6..0000000000
--- a/src/System.Runtime/ref/4.1.0/System.Runtime.depproj
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
-  <PropertyGroup>
-    <AssemblyVersion>4.1.0.0</AssemblyVersion>
-    <OutputType>Library</OutputType>
-    <NuGetTargetMoniker>.NETStandard,Version=v1.5</NuGetTargetMoniker>
-  </PropertyGroup>
-  <ItemGroup>
-    <None Include="project.json" />
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
-</Project>
\ No newline at end of file
diff --git a/src/System.Runtime/src/Configurations.props b/src/System.Runtime/src/Configurations.props
index f71bd28c11..d3acc59a8a 100644
--- a/src/System.Runtime/src/Configurations.props
+++ b/src/System.Runtime/src/Configurations.props
@@ -2,7 +2,6 @@
 <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <BuildConfigurations>
-      netstandard1.5;
       net461-Windows_NT;
       uap101aot-Windows_NT;
       netcoreapp1.2corert-Windows_NT;
diff --git a/src/System.Runtime/src/System.Runtime.csproj b/src/System.Runtime/src/System.Runtime.csproj
index 8749c28b00..32b3ec4116 100644
--- a/src/System.Runtime/src/System.Runtime.csproj
+++ b/src/System.Runtime/src/System.Runtime.csproj
@@ -4,14 +4,10 @@
   <PropertyGroup>
     <ProjectGuid>{56B9D0A9-44D3-488E-8B42-C14A6E30CAB2}</ProjectGuid>
     <AssemblyName>System.Runtime</AssemblyName>
-    <AssemblyVersion Condition="'$(TargetGroup)'=='netstandard1.5'">4.1.1.0</AssemblyVersion>
-    <ContractProject Condition="'$(AssemblyVersion)'=='4.1.1.0'">../ref/4.1.0/System.Runtime.depproj</ContractProject>
     <IsPartialFacadeAssembly>true</IsPartialFacadeAssembly>
     <GenFacadesArgs Condition="'$(TargetGroup)' == 'uap101aot' Or '$(TargetGroup)' == 'netcoreapp1.2corert'">$(GenFacadesArgs) -ignoreMissingTypes</GenFacadesArgs>
   </PropertyGroup>
   <!-- Default configurations to help VS understand the configurations -->
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard1.5-Debug|AnyCPU'" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='netstandard1.5-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net461-Windows_NT-Debug|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='net461-Windows_NT-Release|AnyCPU'" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='uap101aot-Windows_NT-Debug|AnyCPU'" />
@@ -38,18 +34,18 @@
     <Compile Include="System\Runtime\CompilerServices\Attributes.cs" />
     <Compile Include="System\IO\FileAttributes.cs" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetGroup)' != 'net461' and '$(TargetGroup)' != 'netstandard1.5'">
+  <ItemGroup Condition="'$(TargetGroup)' != 'net461'">
     <Compile Include="System\Runtime\NgenServicingAttributes.cs" />
     <Compile Include="System\IO\HandleInheritability.cs" />
     <Compile Include="System\Runtime\ConstrainedExecution\PrePrepareMethodAttribute.cs" />
     <Compile Include="System\Runtime\CompilerServices\SpecialNameAttribute.cs" />
     <Compile Include="System\Threading\WaitHandleExtensions.cs" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetGroup)' == 'netstandard1.5' or '$(TargetGroup)' == 'netstandard'">
+  <ItemGroup Condition="'$(TargetGroup)' == 'netstandard'">
     <Compile Include="System\ComponentModel\DefaultValueAttribute.cs" />
   </ItemGroup>
   <ItemGroup>
-    <ProjectReference Include="..\..\System.Private.Uri\src\System.Private.Uri.csproj" Condition="'$(TargetGroup)' == 'netstandard1.5' or '$(TargetGroup)' == 'netstandard' or '$(TargetGroup)' == 'uap101aot'" />
+    <ProjectReference Include="..\..\System.Private.Uri\src\System.Private.Uri.csproj" Condition="'$(TargetGroup)' == 'netstandard' or '$(TargetGroup)' == 'uap101aot'" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetGroup)' != 'net461'">
     <TargetingPackReference Include="System.Private.CoreLib" />