Asp.Net Core中使用ModelConvention为webapi添加版本号

实现IApplicationModelConvention接口：

public class NameSpaceVersionRoutingConvention:IApplicationModelConvention
    {
        private readonly string apiPrefix;
        private const string urlTemplate = "{0}/{1}/{2}";
        public NameSpaceVersionRoutingConvention(string apiPrefix = "api")
        {
            this.apiPrefix = apiPrefix;
        }

        public void Apply(ApplicationModel application)
        {
            foreach (var controller in application.Controllers)
            {

                var hasRouteAttribute = controller.Selectors
                .Any(x => x.AttributeRouteModel != null);
                if (!hasRouteAttribute)
                {
                    continue;
                }
                var nameSpaces = controller.ControllerType.Namespace.Split('.');
                //获取namespace中版本号部分
                var version = nameSpaces.FirstOrDefault(x => Regex.IsMatch(x, @"^v(d+)$"));
                if (string.IsNullOrEmpty(version))
                {
                    continue;
                }
                string template = string.Format(urlTemplate, apiPrefix, version,
                controller.ControllerName);
                controller.Selectors[0].AttributeRouteModel = new AttributeRouteModel()
                {
                    Template = template
                };
            }
        }
    }

controller的命名空间后加版本号，controller上必须添加RouteAttribute，Action上必须添加路由：

namespace MVCCore3._1Demo.Controllers.v1
{
    [Route("api/[controller]")]
    public class HomeController : Controller
    {
        [HttpGet("index")]
        public IActionResult Index()
        {
            return View();
        }

    }
}

也可以使用中间件实现webapi版本号 https://www.cnblogs.com/lonelyxmas/p/10325436.html