ASP.Net Core MVC DateTime Parameters

Question

I wanted to share how I worked through using DateTime parameters in my .NET Core MVC Controllers. I used this to create a date range filter capability in my solution.

Incorrect

[HttpGet, Route("dateRange/{start}/{end}")] public IActionResult Get(DateTime start, DateTime end) { //invalid values (e.g. /bogus/52) get converted to a valid DateTime value of 1/1/0001 00:00:00.001 if (start != DateTime.MinValue && end != DateTime.MinValue) { if (start < end) { return Json(_Repo.GetByDateRange(start, end)); } } return BadRequest("Invalid Date Range"); }

Nathan Agersea · Accepted Answer · 2017-02-13 17:57:32Z

The better way:

[HttpGet, Route("dateRange/{start:datetime}/{end:datetime}")] public IActionResult Get(DateTime start, DateTime end) { if (start < end) { return Json(_Repo.GetByDateRange(start, end)); } return BadRequest("Invalid Date Range"); }

The key is the :datetime Constraint in the Route Annotation. This instructs .NET to enforce DateTime and to return a 404 Response automatically for invalid param values. This is much cleaner than inspecting the input and handling bad responses in code.

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