可选的DateTime Web API

Question

我有一个这样的课:

public class FooController : ApiController
    {
        [System.Web.Http.Route("live/topperformers")]
        [System.Web.Http.AcceptVerbs("GET", "POST")]
        [System.Web.Http.HttpGet]
        public List<string> GetTopPerformers()
        {
            return new List<string>();
        }
}

当我通过访问" http://foo.com/live/topperformers " 访问它时,效果很好.所以现在我想为这个方法添加一个可选的DateTime参数,所以我修改了方法以获取DAteTime参数,并使其可以为空.

public class FooController : ApiController
    {
        [System.Web.Http.Route("live/topperformers/{dateTime:DateTime}")]
        [System.Web.Http.AcceptVerbs("GET", "POST")]
        [System.Web.Http.HttpGet]
        public List<string> GetTopPerformers(DateTime? dateTime)
        {
            return new List<string>();
        }
}

当我尝试访问没有参数的URL时,就像我之前访问的那样 - 它给出了404.在日期值中像"喜欢"一样http://foo.com/live/topperformers/2010-01-01 "工作正常.但没有约会,它给出了404.

我认为Web API以这种方式支持可选参数？我可以简单地重载并拥有两个版本,但这只能通过一种方法实现吗？

Answer 1

设置可选参数= null.试试这个:

public class FooController : ApiController
    {
        [System.Web.Http.Route("live/topperformers/{dateTime:DateTime?}")]
        [System.Web.Http.AcceptVerbs("GET", "POST")]
        [System.Web.Http.HttpGet]
        public List<string> GetTopPerformers(DateTime? dateTime = null)
        {
            return new List<string>();
        }
}