// This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
      services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
      services.AddApiVersioning(o =>
      {
        o.ReportApiVersions = true;
        o.AssumeDefaultVersionWhenUnspecified = true;
        o.DefaultApiVersion = new ApiVersion(1, 0);
        //o.ApiVersionReader = new HeaderApiVersionReader("x-api-version");
      });
    }

//版本1控制器
  [ApiVersion("1.0", Deprecated = true)]
  [Route("api/values")]
  [ApiController]
  public class ValuesV1Controller : ControllerBase
  {
    [HttpGet]
    public IEnumerable<string> Get()
    {
      return new string[] { "这是版本1.0返回的——数据1", "这是版本1.0返回的——数据2" };
    }
  }

//版本2控制器
  [ApiVersion("2.0")]
  [Route("api/values")]
  [ApiController]
  public class ValuesV2Controller : ControllerBase
  {
    [HttpGet]
    public IEnumerable<string> Get()
    {
      return new string[] { "这是版本2.0返回的——数据1", "这是版本2.0返回的——数据2" };
    }
  }