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

This reverts commit 72b05bc8.

Change-Id: I17510b7fa49b9861ce0a870b16f5c14a41082db5

net/FlatBuffers/FlatBuffers.csproj

-<Project Sdk="Microsoft.NET.Sdk">
-
+<?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')" />
   <PropertyGroup>
-    <TargetFrameworks>netstandard1.1;netstandard1.4;netstandard2.0</TargetFrameworks>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{28C00774-1E73-4A75-AD8F-844CD21A064D}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>FlatBuffers</RootNamespace>
     <AssemblyName>FlatBuffers</AssemblyName>
-    <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>
+    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
   </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>
-    <PackageReference Include="System.Memory" Version="4.5.1" />
+    <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.
-csc SampleBinary.cs MyGame/Sample/*.cs ../net/FlatBuffers/*.cs
+mcs SampleBinary.cs MyGame/Sample/*.cs ../net/FlatBuffers/*.cs
 mono SampleBinary.exe
 
 # Cleanup temporary files.