在Visual Studio中将现有.NET Framework项目迁移至.NET Core 1.1 Preview 1

1）下载安装包含 .NET Core 1.1 Preview 1 的 SDK：Windows x64 安装包（下载地址列表）

2）下载最新 VS 2015 NuGet 插件：https://dist.nuget.org/index.html

3）创建一个扩展名位 .sln 的空白文件，将以下内容复制粘贴到这个 .sln 文件中。

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 14
VisualStudioVersion = 14.0.25420.1
MinimumVisualStudioVersion = 10.0.40219.1
Global
    GlobalSection(SolutionConfigurationPlatforms) = preSolution
        Debug|Any CPU = Debug|Any CPU
        Release|Any CPU = Release|Any CPU
    EndGlobalSection
    GlobalSection(ProjectConfigurationPlatforms) = postSolution
        {8BC01464-6079-4603-881A-9F8716BA6F7D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
        {8BC01464-6079-4603-881A-9F8716BA6F7D}.Debug|Any CPU.Build.0 = Debug|Any CPU
        {8BC01464-6079-4603-881A-9F8716BA6F7D}.Release|Any CPU.ActiveCfg = Release|Any CPU
        {8BC01464-6079-4603-881A-9F8716BA6F7D}.Release|Any CPU.Build.0 = Release|Any CPU
    EndGlobalSection
    GlobalSection(SolutionProperties) = preSolution
        HideSolutionNode = FALSE
    EndGlobalSection
EndGlobal

这样就创建了一个空白的 .NET Core 解决方案文件。

3）在各个VS项目文件夹（.csproj文件所在的文件夹）中创建扩展名位 .xproj 的空文件，将下面的内容复制/粘贴至其中，并将 RootNamespace 的值设置为当前项目的命名空间。

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)MicrosoftVisualStudiov$(VisualStudioVersion)</VSToolsPath>
  </PropertyGroup>
  <Import Project="$(VSToolsPath)DotNetMicrosoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
  <PropertyGroup Label="Globals">
    <ProjectGuid>8bc01464-6079-4603-881a-9f8716ba6f7d</ProjectGuid>
    <RootNamespace></RootNamespace>
    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.obj</BaseIntermediateOutputPath>
    <OutputPath Condition="'$(OutputPath)'=='' ">.in</OutputPath>
    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
  </PropertyGroup>
  <PropertyGroup>
    <SchemaVersion>2.0</SchemaVersion>
  </PropertyGroup>
  <ItemGroup>
    <DnxInvisibleContent Include="bower.json" />
    <DnxInvisibleContent Include=".bowerrc" />
    <DnxInvisibleContent Include="ConnectionString.config" />
    <DnxInvisibleContent Include="packages.config" />
    <DnxInvisibleContent Include="Web.config" />
  </ItemGroup>
  <Import Project="$(VSToolsPath)DotNet.WebMicrosoft.DotNet.Web.targets" Condition="'$(VSToolsPath)' != ''" />
</Project>

4）在各个项目文件夹中添加如下包含基本配置的 project.json 文件：

{
  "dependencies": {
    "Microsoft.NETCore.App": "1.1.0-preview1-*"
  },
  "frameworks": {
    "netcoreapp1.1": {
      "imports": [
        "portable-net45+win8+wp8"
      ]
    }
  }
}

5）对于 MVC 或 Web API 项目

5.1）在 project.json 中添加 buildOptions, runtimeOptions 与 publishOptions 的配置

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

5.2）添加 Program.cs 与 Startup.cs 文件

Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        var host = new WebHostBuilder()
                    .UseKestrel()
                    .UseUrls("http://*:5000")
                    .UseContentRoot(Directory.GetCurrentDirectory())
                    .UseIISIntegration()
                    .UseStartup<Startup>()
                    .Build();

        host.Run();
    }
}

Startup.cs

public class Startup
{
    public Startup(IHostingEnvironment env)
    {
        //..
    }

    public IConfigurationRoot Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        //..
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        //..
    }
}