.NET Core单文件发布静态编译AOT CoreRT，将.NET Core应用打包成一个可执行文件并包含运行时。
支持Windows, MacOS and Linux x64 w/ RyuJIT codegen。
示例项目：
https://github.com/dotnet/corert/tree/master/samples/WebApi
下面来实际体验。
首先确保安装C++编译环境，以及.NET Core 2.0 以上版本SDK。
新建WebAPI应用
打开命令提示符，输入如下：
dotnet new webapi -o zeroapi
cd zeroapi
新建WebAPI应用。
添加CoreRT到项目
目前CoreRT还是alpha版，在myget上有包。
首先添加一个nuget.config
dotnet new nuget
然后在 <packageSources> 节点添加如下：
<add key="dotnet-core" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
<add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
接着添加Microsoft.DotNet.ILCompiler包引用：
dotnet add package Microsoft.DotNet.ILCompiler -v 1.0.0-alpha-*
替换默认services并处理反射
打开Startup.cs ,将 services.AddMvc(); 替换成 services.AddMvcCore().AddJsonFormatters();
接着创建一个rd.xml 配置文件，用于反射处理运行时，确保反射程序集编译到程序中。
rd.xml配置文件如下：
<Directives>
<Application>
<Assembly Name="zeroapi" Dynamic="Required All" />
<Assembly Name="Microsoft.AspNetCore.Server.Kestrel.Core">
<Type Name="Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Server.Kestrel.Core.Internal.KestrelServerOptionsSetup" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.AspNetCore.Server.Kestrel" Dynamic="Required All"/>
<Assembly Name="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv">
<Type Name="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.LibuvTransportFactory" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.LibuvTransportOptions" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.DependencyInjection" Dynamic="Required All">
<Type Name="Microsoft.Extensions.DependencyInjection.DefaultServiceProviderFactory" Dynamic="Required All" />
<Type Name="Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteExpressionBuilder" Dynamic="Required All" />
<Type Name="Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver" Dynamic="Required All" />
<Type Name="Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteValidator" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.Options">
<Type Name="Microsoft.Extensions.Options.OptionsManager`1[[Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerOptions,Microsoft.AspNetCore.Server.Kestrel.Core]]" Dynamic="Required All" />
<Type Name="Microsoft.Extensions.Options.OptionsFactory`1[[Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerOptions,Microsoft.AspNetCore.Server.Kestrel.Core]]" Dynamic="Required All" />
<Type Name="Microsoft.Extensions.Options.OptionsMonitor`1[[Microsoft.Extensions.Logging.Console.ConsoleLoggerOptions,Microsoft.Extensions.Logging.Console]]" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.AspNetCore.Mvc.Core" Dynamic="Required All" />
<Assembly Name="Microsoft.AspNetCore.Routing">
<Type Name="Microsoft.AspNetCore.Routing.Internal.RoutingMarkerService" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Builder.RouterMiddleware" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Routing.Tree.TreeRouteBuilder" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Routing.DefaultInlineConstraintResolver" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Routing.RouteOptions" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.AspNetCore.Mvc.Formatters.Json">
<Type Name="Microsoft.AspNetCore.Mvc.Formatters.Json.Internal.MvcJsonMvcOptionsSetup" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Mvc.MvcJsonOptions" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.AspNetCore.Authorization">
<Type Name="Microsoft.AspNetCore.Authorization.DefaultAuthorizationPolicyProvider" Dynamic="Required All" />
<Type Name="Microsoft.AspNetCore.Authorization.AuthorizationOptions" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.AspNetCore.Http">
<Type Name="Microsoft.AspNetCore.Http.HttpContextFactory" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.AspNetCore.Hosting" Dynamic="Required All">
<Type Name="Microsoft.AspNetCore.Hosting.Internal.ApplicationLifetime" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.Logging.Abstractions">
<Type Name="Microsoft.Extensions.Logging.Logger`1[[Microsoft.AspNetCore.Hosting.Internal.WebHost,Microsoft.AspNetCore.Hosting]]" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.Logging">
<Type Name="Microsoft.Extensions.Logging.LoggerFactory" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.Logging.Console">
<Type Name="Microsoft.Extensions.Logging.Console.ConsoleLoggerOptions" Dynamic="Required All" />
<Type Name="Microsoft.Extensions.Logging.Console.ConsoleLoggerProvider" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.Logging.Debug">
<Type Name="Microsoft.Extensions.Logging.Debug.DebugLogger" Dynamic="Required All" />
<Type Name="Microsoft.Extensions.Logging.Debug.DebugLoggerProvider" Dynamic="Required All" />
</Assembly>
<Assembly Name="System.Linq.Expressions">
<Type Name="System.Linq.Expressions.ExpressionCreator`1[[Newtonsoft.Json.Serialization.ObjectConstructor`1[[System.Object,System.Private.CoreLib]],Newtonsoft.Json]]" Dynamic="Required All" />
<Type Name="System.Linq.Expressions.ExpressionCreator`1[[System.Func`2[[System.Object,System.Private.CoreLib],[System.Object,System.Private.CoreLib]],System.Private.CoreLib]]" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.ObjectPool">
<Type Name="Microsoft.Extensions.ObjectPool.DefaultObjectPoolProvider" Dynamic="Required All" />
</Assembly>
<Assembly Name="Newtonsoft.Json">
<Type Name="Newtonsoft.Json.Serialization.ObjectConstructor`1[[System.Object,System.Private.CoreLib]]" Dynamic="Required All" />
</Assembly>
<Assembly Name="System.ComponentModel.TypeConverter">
<Type Name="System.ComponentModel.TypeConverter" Dynamic="Required All" />
<Type Name="System.ComponentModel.StringConverter" Dynamic="Required All" />
<Type Name="System.ComponentModel.Int32Converter" Dynamic="Required All" />
</Assembly>
<Assembly Name="Microsoft.Extensions.Configuration.Json">
<Type Name="Microsoft.Extensions.Configuration.Json.JsonConfigurationSource" Dynamic="Required All" />
</Assembly>
</Application>
</Directives>
其中如果你要替换成自己的程序，更改 <Assembly Name="zeroapi" Dynamic="Required All" /> 中的Name。
打开zeroapi.csproj
在<PropertyGroup>节点下将 <RdXmlFile>rd.xml</RdXmlFile> 加入。
接着将 <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.3" /> 替换成如下：
<PackageReference Include="Microsoft.AspNetCore" Version="2.0.1" /><PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.0.1" /><PackageReference Include="Microsoft.AspNetCore.Mvc.Formatters.Json" Version="2.0.1" />
接着将 ValuesController 更改一下，确保功能正常，如下：
public class ValuesController
{
[HttpGet("/")]
public string Hello() => "Hello World! LineZero AOT";
// GET api/values
[HttpGet("/api/values")]
public IEnumerable<string> Get()
{
return new string[] { "AOT", "CoreRT" };
}
// GET api/values/5
[HttpGet("/api/values/{id}")]
public string Get(int id)
{
return "Your value is " + id;
}
}
程序改造完成，接着最重要的发布。
还原并发布
发布之前，使用dotnet run 确保功能正常运行。
发布请打开 x64 Native Tools Command Prompt for VS 2017 ，注意一定在此命令行发布。在开始菜单找到 Visual Studio 2017，打开就能找到。
发布命令还是 dotnet publish -r <RID> -c <Configuration>
这里发布Windows 64位 dotnet publish -r win-x64 -c release，初次的话会默认还原对应的包，需要一些时间。
发布完成后，打开binx64 elease etcoreapp2.0win-x64publish 文件夹，里面zeroapi.exe即为最终文件，执行即可。
可以看到最终大小为21m左右。然后访问http://localhost:5000/ 如图：
控制台Demo
新建一个控制台应用，使用AOT发布。
单纯控制台，没有反射的内容，无需要rd.xml 文件。
代码如下：
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
Console.WriteLine("LineZero AOT Demo！");
Console.ReadKey();
}
}
最终 dotnet publish -r win-x64 -c release 发布
最终单个文件大小不到4m！
目前该技术还是早期版本，期待微软最终带到正式版。
GitHub：https://github.com/dotnet/corert
