ASP.NET Core 3.0 实战：构建多版本 API 接口

　　　　　　　services.AddApiVersioning((o) =>
            {
                o.ReportApiVersions = true;//可选配置，设置为true时，header返回版本信息
                o.DefaultApiVersion = new ApiVersion(1, 0);//默认版本，请求未指明版本的求默认认执行版本1.0的API
                o.AssumeDefaultVersionWhenUnspecified = true;//是否启用未指明版本API，指向默认版本
            }).AddVersionedApiExplorer(option =>
            {
                option.GroupNameFormat = "‘v‘VVVV";//api组名格式
                option.AssumeDefaultVersionWhenUnspecified = true;//是否提供API版本服务
            }).AddSwaggerGen((s) =>
            {
                //填充UI内容
                var provider = services.BuildServiceProvider().GetRequiredService<IApiVersionDescriptionProvider>();
                foreach (var description in provider.ApiVersionDescriptions)
                {
                    s.SwaggerDoc(description.GroupName,
                         new Info()
                         {
                             Title = $"体检微服务接口 v{description.ApiVersion}",
                             Version = description.ApiVersion.ToString(),
                             Description = "微服务框架-切换版本请点右上角版本切换",
                             Contact = new Contact() { Name = "荣少（黎更荣） WeChat:186***** QQ:157537648", Email = "*******@hotmail.com" }
                         }
                    );
                }
                //生成API XML文档
                var basePath = PlatformServices.Default.Application.ApplicationBasePath;
                var xmlPath = Path.Combine(basePath, typeof(Startup).GetTypeInfo().Assembly.GetName().Name + ".xml");
                s.IncludeXmlComments(xmlPath);
            });

            app.UseSwagger().UseSwaggerUI((o) =>
            {
                foreach (var description in provider.ApiVersionDescriptions)
                {
                    o.SwaggerEndpoint($"/swagger/{description.GroupName}/swagger.json", description.GroupName.ToUpperInvariant());
                }
            });

//项目自动生成的版本
public void Configure(IApplicationBuilder app, IHostingEnvironment env)

//参数补上后的版本 
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApiVersionDescriptionProvider provider)

namespace WebApplication1.Controllers.v1
{
    [ApiVersion("1.0")]
    [Route("api/v{version:apiVersion}/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        [HttpGet]
        public ActionResult<IEnumerable<string>> Get()
        {
            return new string[] { "v1", "v1" };
        }
    }
}

namespace WebApplication1.Controllers.v2
{
    [ApiVersion("2.0")]
    [Route("api/v{version:apiVersion}/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        [HttpGet]
        public ActionResult<IEnumerable<string>> Get()
        {
            return new string[] { "v2", "v2" };
        }
    }
}