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.NET 快速开始

第 1 步:编写基础应用#

安装 .NET Core SDK 3.1。在 Console 中,使用 dotnet 命令新建一个空 Web 项目:

dotnet new web -o helloworld-csharpcd helloworld-csharp

更新 Program.cs 中的 CreateHostBuilder 定义,侦听 8080 端口:

using System;using Microsoft.AspNetCore.Hosting;using Microsoft.Extensions.Hosting;
namespace helloworld_csharp{    public class Program    {        public static void Main(string[] args)        {            CreateHostBuilder(args).Build().Run();        }
        public static IHostBuilder CreateHostBuilder(string[] args)        {            string port = "8080";            string url = String.Concat("http://0.0.0.0:", port);
            return Host.CreateDefaultBuilder(args)                .ConfigureWebHostDefaults(webBuilder =>                {                    webBuilder.UseStartup<Startup>().UseUrls(url);                });        }    }}

Startup.cs 的内容更新为如下:

using System;using Microsoft.AspNetCore.Builder;using Microsoft.AspNetCore.Hosting;using Microsoft.AspNetCore.Http;using Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Hosting;
namespace helloworld_csharp{    public class Startup    {        // This method gets called by the runtime. Use this method to add services to the container.        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940        public void ConfigureServices(IServiceCollection services)        {        }
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)        {            if (env.IsDevelopment())            {                app.UseDeveloperExceptionPage();            }
            app.UseRouting();
            app.UseEndpoints(endpoints =>            {                endpoints.MapGet("/", async context =>                {                    await context.Response.WriteAsync("Hello World!\n");                });            });        }    }}

以上代码会创建一个基本的 Web 服务器,并监听 8080 端口。

第 2 步:将应用容器化#

在项目根目录下,创建一个名为 Dockerfile 的文件,内容如下:

# 使用微软官方 .NET 镜像作为构建环境# https://hub.docker.com/_/microsoft-dotnet-core-sdk/FROM mcr.microsoft.com/dotnet/core/sdk:3.1-alpine AS buildWORKDIR /app
# 安装依赖COPY *.csproj ./RUN dotnet restore
# 将本地代码拷贝到容器内COPY . ./WORKDIR /app
# 构建项目RUN dotnet publish -c Release -o out
# 使用微软官方 .NET 镜像作为运行时镜像# https://hub.docker.com/_/microsoft-dotnet-core-aspnet/FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-alpine AS runtimeWORKDIR /appCOPY --from=build /app/out ./
# 启动服务ENTRYPOINT ["dotnet", "helloworld-csharp.dll"]

添加一个 .dockerignore 文件,以从容器映像中排除文件:

**/obj/**/bin/

第 3 步(可选):本地构建镜像#

如果您本地已经安装了 Docker,可以运行以下命令,在本地构建 Docker 镜像:

docker build -t helloworld-csharp .

构建成功后,运行 docker images,可以看到构建出的镜像:

REPOSITORY          TAG       IMAGE ID         CREATED            SIZEhelloworld-csharp   latest    1c8dfb88c823     8 seconds ago      105MB

随后您可以将此镜像上传至您的镜像仓库。

第 4 步:部署到 CloudBase 云托管#

请参考 部署服务版本配置说明