Pass optional Date param into a Web Api 2 Web service

Hi there,

I've written a simple IOS app that lists sender details, using MS Web API 2 framework. I need to be able to pass in an optional date param, but i'm having issues. This is the controller:

    public class SummaryController : ApiController
        /// <summary>
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="displayLength"></param>
        /// <param name="displayStart"></param>
        /// <param name="from"></param>
        /// <param name="to"></param>
        /// <returns></returns>
        public HttpResponseMessage GetSenderMessages(string sender, int? displayLength, int? displayStart,
            [FromUri] DateTime from, 
            [FromUri] DateTime to,

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When I call this using:


I keep getting invalid signature -  my call is incorrect. What am I doing wrong?
Wayne AthertonProduct Analyst Financial Messaging LondonAsked:
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käµfm³d 👽Commented:
You need to provide defaults for the values that are default. The official documentation provides examples of this.
Wayne AthertonProduct Analyst Financial Messaging LondonAuthor Commented:

Thanks for the post - so after reading this is it true to say that you can't pass nothing. My method basically looks for a date value and if one is received the. The result set is filtered accordingly. If no date then it does something else.

Therefore, I need to be able to not default to a specific value for the From / To parameters.
käµfm³d 👽Commented:
So make them nullable, and set the default value to null.


public HttpResponseMessage GetSenderMessages(string sender, int? displayLength, int? displayStart,
            [FromUri] DateTime? from = null, 
            [FromUri] DateTime? to = null,

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