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)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
</PropertyGroup>
<Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
<PropertyGroup Label="Globals">
<ProjectGuid>8bc01464-6079-4603-881a-9f8716ba6f7d</ProjectGuid>
<RootNamespace></RootNamespace>
<BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
<OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</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="$(VSToolsPath)\DotNet.Web\Microsoft.DotNet.Web.targets" Condition="'$(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)
{
//..
}
}