通常在DDD开发架构中，我们写完服务层需要在控制器中写API，今天介绍一个组件 Plus.AutoApi 可以用它来动态生成 Restful 风格的 WebApi，不用写 Controller。
在你的应用服务层中添加组件
Install-Package Plus.AutoApi在 Startup 中注册 AutoApi
public void ConfigureServices(IServiceCollection services) { services.AddAutoApi(x => { }); }AddAutoApi 同时也支持各种 Options 参数，可以自行查看。
让你的服务直接或者间接实现IAutoApi，添加特性[AutoApi]即可，示例代码如下：
[AutoApi] public class WeatherService : IAutoApi { private static readonly string[] Summaries = new[] { "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching" }; public IEnumerable<WeatherForecast> Get() { return WeatherForecast(); } [HttpGet("{id}")] public IEnumerable<WeatherForecast> Get(int id) { return WeatherForecast(); } public IEnumerable<WeatherForecast> Post() { return WeatherForecast(); } [HttpPut("{id}")] public IEnumerable<WeatherForecast> Put(int id) { return WeatherForecast(); } [HttpDelete("{id}")] public IEnumerable<WeatherForecast> Delete(int id) { return WeatherForecast(); } private static IEnumerable<WeatherForecast> WeatherForecast() { var rng = new Random(); return Enumerable.Range(1, 5).Select(index => new WeatherForecast { Date = DateTime.Now.AddDays(index), TemperatureC = rng.Next(-20, 55), Summary = Summaries[rng.Next(Summaries.Length)] }).ToArray(); } }需要注意的是你的服务层命名规范，默认要以Service或者ApplicationService结尾，也可以通过配置替换默认名称。
如果你想让某个服务不自动生成API，可以给特性传递参数：[AutoApi(Disabled = true)]
让生成的API兼容 Swagger，需要添加下面这句代码。
services.AddSwaggerGen(options => { options.SwaggerDoc("v1", new OpenApiInfo { Title = "Plus AutoApi Sample", Version = "v1.0.0" }); options.DocInclusionPredicate((docName, description) => true); });同时自动生成API也可以和控制器共存，互不影响。你可以手动指定HTTP方法，也可以根据默认规则自动创建。
默认自动创建HTTP方法的规则如下：
static PlusConsts() { HttpVerbs = new Dictionary<string, string>() { ["add"] = "POST", ["create"] = "POST", ["post"] = "POST", ["insert"] = "POST", ["get"] = "GET", ["find"] = "GET", ["fetch"] = "GET", ["query"] = "GET", ["update"] = "PUT", ["put"] = "PUT", ["delete"] = "DELETE", ["remove"] = "DELETE" }; }上面代码最终生成的API路由如下：
https://github.com/Meowv/Plus.AutoApi/tree/master/samples/Plus.AutoApi.Sample
https://www.nuget.org/packages/Plus.AutoApi
https://github.com/Meowv/Plus.AutoApi
