Convert net/FlatBuffers project to be compatible with netstandard (#4811)

net/FlatBuffers/FlatBuffers.csproj

-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+<Project Sdk="Microsoft.NET.Sdk">
+
   <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{28C00774-1E73-4A75-AD8F-844CD21A064D}</ProjectGuid>
-    <OutputType>Library</OutputType>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <TargetFrameworks>netstandard1.1;netstandard1.4;netstandard2.0</TargetFrameworks>
     <RootNamespace>FlatBuffers</RootNamespace>
     <AssemblyName>FlatBuffers</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
+    <AssemblyVersion>1.0.0.0</AssemblyVersion>
+    <Copyright>Copyright (c) 2015 Google Inc</Copyright>
+    <RepositoryUrl>https://github.com/google/flatbuffers</RepositoryUrl>
+    <PackageLicenseUrl>https://github.com/google/flatbuffers/blob/master/LICENSE.txt</PackageLicenseUrl>
   </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="System" />
-    <Reference Include="System.Core" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="ByteBuffer.cs" />
-    <Compile Include="FlatBufferBuilder.cs" />
-    <Compile Include="FlatBufferConstants.cs" />
-    <Compile Include="IFlatbufferObject.cs" />
-    <Compile Include="Offset.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="Struct.cs" />
-    <Compile Include="Table.cs" />
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="BeforeBuild">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
+
 </Project>
\ No newline at end of file

net/FlatBuffers/Properties/AssemblyInfo.cs

-/*
- * Copyright 2014 Google Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-using System.Reflection;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-// General Information about an assembly is controlled through the following
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-[assembly: AssemblyTitle("FlatBuffers")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("FlatBuffers")]
-[assembly: AssemblyCopyright("Copyright (c) 2015 Google Inc")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-// Setting ComVisible to false makes the types in this assembly not visible
-// to COM components.  If you need to access a type in this assembly from
-// COM, set the ComVisible attribute to true on that type.
-[assembly: ComVisible(false)]
-
-// The following GUID is for the ID of the typelib if this project is exposed to COM
-[assembly: Guid("91c32e64-ef20-47df-9c9f-cec9207bc6df")]
-
-// Version information for an assembly consists of the following four values:
-//
-//      Major Version
-//      Minor Version
-//      Build Number
-//      Revision
-//
-// You can specify all the values or you can default the Build and Revision Numbers
-// by using the '*' as shown below:
-// [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]

samples/csharp_sample.sh

@@ -42,7 +42,7 @@ fi
 echo Compiling and running the C# sample.
 
 # Compile and execute the sample.
-mcs SampleBinary.cs MyGame/Sample/*.cs ../net/FlatBuffers/*.cs
+csc SampleBinary.cs MyGame/Sample/*.cs ../net/FlatBuffers/*.cs
 mono SampleBinary.exe
 
 # Cleanup temporary files.