写在前面
前面写了一篇关于将.NET应用转换成Windows服务的方法，其实真正的目的是为了探索如何将Asp.Net Core Web Api 部署成Windows 服务。基于上一篇的基础，只需把创建 WebApplication 的代码放到 BackgroundService 的ExecuteAsync方法中即可。
其中比较重要的一个细节就是需要指定一下配置：
host.ConfigureAppConfiguration((hostingContext, config) => {
config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
config.AddEnvironmentVariables();
});
appsettings.json 的内容如下：
{"Logging": {"LogLevel": {"Default": "Information","Microsoft.AspNetCore": "Warning"}},"AllowedHosts": "*","urls": "http://localhost:6001","server.urls": "http://localhost:6001"
}
重点部分：
"urls": "http://localhost:6001",
"server.urls": "http://localhost:6001"
代码实现
using System.Runtime.InteropServices;
using System.Text.Json.Serialization;
using Microsoft.Extensions.Hosting;public class Program
{public static void Main(string[] args){CreateHostBuilder(args).Build().Run();}public static IHostBuilder CreateHostBuilder(string[] args){var host = Host.CreateDefaultBuilder(args);//判断当前系统是否为windowsif (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)){host.UseWindowsService();}host.ConfigureAppConfiguration((hostingContext, config) => {config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);config.AddEnvironmentVariables();});return host.ConfigureServices((hostContext, services) =>{ services.AddHostedService<WebApp>();});}
}public class WebApp: BackgroundService
{public void StartApp(){var builder = WebApplication.CreateSlimBuilder([]);builder.Services.ConfigureHttpJsonOptions(options =>{options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);});var app = builder.Build();var sampleTodos = new Todo[] {new(1, "Walk the dog"),new(2, "Do the dishes", DateOnly.FromDateTime(DateTime.Now)),new(3, "Do the laundry", DateOnly.FromDateTime(DateTime.Now.AddDays(1))),new(4, "Clean the bathroom"),new(5, "Clean the car", DateOnly.FromDateTime(DateTime.Now.AddDays(2)))};var todosApi = app.MapGroup("/todos");todosApi.MapGet("/", () => sampleTodos);todosApi.MapGet("/{id}", (int id) =>sampleTodos.FirstOrDefault(a => a.Id == id) is { } todo? Results.Ok(todo): Results.NotFound());app.Run();}protected override async Task ExecuteAsync(CancellationToken stoppingToken){StartApp();}
}public record Todo(int Id, string? Title, DateOnly? DueBy = null, bool IsComplete = false);[JsonSerializable(typeof(Todo[]))]
internal partial class AppJsonSerializerContext : JsonSerializerContext
{}
项目目录结构：
运行目录结构：
setup.bat 内容：
sc create MyService binPath= %~dp0AspNetCoreWindowsService.exe
sc failure MyService actions= restart/60000/restart/60000/""/60000 reset= 86400
sc start MyService
sc config MyService start=auto调用示例
执行setup.bat
服务被成功创建并运行
用浏览器访问一下
访问正常，到此结束。
