Duplicate Project Reference Example

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README.md

Example of a csproj with a duplicate project reference

DuplicateReferenceExample.csproj

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" 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>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProjectGuid>{88C46CED-0008-4987-9F69-832ECB4415E7}</ProjectGuid>
    <OutputType>Exe</OutputType>
    <RootNamespace>DuplicateReferenceExample</RootNamespace>
    <AssemblyName>DuplicateReferenceExample</AssemblyName>
    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <PlatformTarget>AnyCPU</PlatformTarget>
    <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' ">
    <PlatformTarget>AnyCPU</PlatformTarget>
    <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" />
    <Reference Include="System.Xml.Linq" />
    <Reference Include="System.Data.DataSetExtensions" />
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="System.Data" />
    <Reference Include="System.Net.Http" />
    <Reference Include="System.Xml" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="Program.cs" />
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="ReferencedLibrary.csproj">
      <Project>{774107f3-3d8c-4323-94b7-67e46066340d}</Project>
      <Name>ReferencedLibrary</Name>
    </ProjectReference>
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="ReferencedLibrary.csproj">
      <Project>{774107f3-3d8c-4323-94b7-67e46066340d}</Project>
      <Name>ReferencedLibrary</Name>
    </ProjectReference>
  </ItemGroup>
  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
  
</Project>

DuplicateReferenceExample.sln


Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 14
VisualStudioVersion = 14.0.25420.1
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DuplicateReferenceExample", "DuplicateReferenceExample.csproj", "{88C46CED-0008-4987-9F69-832ECB4415E7}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ReferencedLibrary", "ReferencedLibrary.csproj", "{774107F3-3D8C-4323-94B7-67E46066340D}"
EndProject
Global
	GlobalSection(SolutionConfigurationPlatforms) = preSolution
		Debug|Any CPU = Debug|Any CPU
		Release|Any CPU = Release|Any CPU
	EndGlobalSection
	GlobalSection(ProjectConfigurationPlatforms) = postSolution
		{88C46CED-0008-4987-9F69-832ECB4415E7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{88C46CED-0008-4987-9F69-832ECB4415E7}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{88C46CED-0008-4987-9F69-832ECB4415E7}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{88C46CED-0008-4987-9F69-832ECB4415E7}.Release|Any CPU.Build.0 = Release|Any CPU
		{774107F3-3D8C-4323-94B7-67E46066340D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{774107F3-3D8C-4323-94B7-67E46066340D}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{774107F3-3D8C-4323-94B7-67E46066340D}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{774107F3-3D8C-4323-94B7-67E46066340D}.Release|Any CPU.Build.0 = Release|Any CPU
	EndGlobalSection
	GlobalSection(SolutionProperties) = preSolution
		HideSolutionNode = FALSE
	EndGlobalSection
EndGlobal

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DuplicateReferenceExample
{
    class Program
    {
        static void Main(string[] args)
        {
        }
    }
}

ReferencedLibrary.csproj

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" 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>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProjectGuid>774107f3-3d8c-4323-94b7-67e46066340d</ProjectGuid>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>ReferencedLibrary</RootNamespace>
    <AssemblyName>ReferencedLibrary</AssemblyName>
    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>    
  </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"/>
    <Reference Include="System.Xml.Linq"/>
    <Reference Include="System.Data.DataSetExtensions"/>
    
    
    <Reference Include="Microsoft.CSharp"/>
    
    <Reference Include="System.Data"/>
    
    <Reference Include="System.Net.Http"/>
    
    <Reference Include="System.Xml"/>
  </ItemGroup>
  <ItemGroup>
  </ItemGroup>
  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
  
 </Project>