Automatically add all none generated EntityTypeConfigurations

ConsoleApplication1.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>{4B7FDFDE-3CFF-4A96-9D76-8B8E495C24DD}</ProjectGuid>
    <OutputType>Exe</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>ConsoleApplication1</RootNamespace>
    <AssemblyName>ConsoleApplication1</AssemblyName>
    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
    <FileAlignment>512</FileAlignment>
    <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="EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL">
      <HintPath>..\packages\EntityFramework.6.1.3\lib\net45\EntityFramework.dll</HintPath>
      <Private>True</Private>
    </Reference>
    <Reference Include="EntityFramework.SqlServer, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL">
      <HintPath>..\packages\EntityFramework.6.1.3\lib\net45\EntityFramework.SqlServer.dll</HintPath>
      <Private>True</Private>
    </Reference>
    <Reference Include="System" />
    <Reference Include="System.ComponentModel.DataAnnotations" />
    <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>
    <None Include="packages.config" />
  </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>

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="EntityFramework" version="6.1.3" targetFramework="net452" />
</packages>

Program.cs

namespace ConsoleApplication1
{
    using System;
    using System.CodeDom.Compiler;
    using System.Collections.Generic;
    using System.Data.Entity;
    using System.Data.Entity.ModelConfiguration;
    using System.Data.Entity.ModelConfiguration.Configuration;
    using System.Linq;
    using System.Reflection;

    class Program
    {
        static void Main(string[] args)
        {
            DbModelBuilder modelBuilder = new DbModelBuilder();
            ConfigurationHelper.AddCustomConfiguration(modelBuilder.Configurations);
        }
    }

    internal class ConfigurationHelper
    {
        private static readonly MethodInfo Method;

        static ConfigurationHelper()
        {
            var addMethods = from method in typeof(ConfigurationRegistrar).GetMethods()
                             where method.Name == nameof(ConfigurationRegistrar.Add)
                             let @params = method.GetParameters()
                             where @params.Length == 1
                             let parameterType = @params.First().ParameterType
                             where parameterType.IsGenericType
                             let genericDefinition = parameterType.GetGenericTypeDefinition()
                             where genericDefinition == typeof(EntityTypeConfiguration<>)
                             select method;
            Method = addMethods.Single();
        }

        public static void AddCustomConfiguration(ConfigurationRegistrar registrar)
        {
            var entityTypeConfigurationTypes = CustomEntityTypeConfigurationTypes().ToList();
            entityTypeConfigurationTypes.ForEach(t => Add(registrar, t));
        }

        private static IEnumerable<Type> CustomEntityTypeConfigurationTypes()
        {
            var types = from type in AssemblyEntityTypeConfigurationTypes()
                        where type.GetCustomAttribute<GeneratedCodeAttribute>() == null
                        select type;
            return types;
        }

        private static IEnumerable<Type> AssemblyEntityTypeConfigurationTypes()
        {
            var types = from type in typeof(ConfigurationHelper).Assembly.DefinedTypes
                        let baseType = type.BaseType
                        where baseType?.IsGenericType ?? false
                        where baseType.GetGenericTypeDefinition() == typeof(EntityTypeConfiguration<>)
                        select type;
            return types;
        }

        private static void Add(ConfigurationRegistrar registrar, Type entityTypeConfigurationType)
        {
            var baseType = entityTypeConfigurationType.BaseType;
            if (baseType?.IsGenericType ?? false)
            {
                if (baseType.GetGenericTypeDefinition() == typeof(EntityTypeConfiguration<>))
                {
                    var entityType = baseType.GenericTypeArguments[0];
                    AddEntityTypeConfigurationToRegistrar(registrar, entityTypeConfigurationType, entityType);
                    return;
                }
            }
            throw new ArgumentException($"Argument should be of type {typeof(EntityTypeConfiguration<>).Name}.", nameof(entityTypeConfigurationType));
        }

        private static void AddEntityTypeConfigurationToRegistrar(ConfigurationRegistrar registrar, Type entityTypeConfigurationType, Type entityType)
        {
            var instance = Activator.CreateInstance(entityTypeConfigurationType);
            var call = Method.MakeGenericMethod(entityType);
            call.Invoke(registrar, new[] { instance });
        }
    }
}