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    <p>I don't think (from my tests and experiments) that you can pass parameters of type <code>DateTime</code> directly. After all, in the end (after all the niceties of the WCF DataService client-side proxy and its LINQ-to-WCF goodness), WCF Data Services is always getting its parameters from the URL query string, so basically, it's all just strings....</p> <p>(this is in stark contrast to using the SOAP bindings for WCF - there, you can definitely use strongly typed parameters - <code>DateTime</code> and anything you like. But WCF Data Services is REST, it's all URL- und thus string-based)</p> <p>So my conclusion is: you need to change your code to use <code>string</code> parameters and then converts those to <code>DateTime</code> inside your method:</p> <pre><code>[WebGet] public IQueryable&lt;Job&gt; LoadJobsByDate(string startDate, string endDate) { // some error checking needs to be done here! If 'startDate' or 'endDate' // are NULL or emtpy string --&gt; fall back to a default // also - you might want to check into .ParseExact and define a list of valid, // supported date formats that you want to offer your users DateTime startDt = DateTime.Parse(startDate); DateTime endDt = DateTime.Parse(endDate); var context = this.CurrentDataSource; var jobs = from j in context.Jobs where j.CreatedDate &gt;= startDt &amp;&amp; j.CreatedDate &lt;= endDt select j; return jobs; } </code></pre> <p>As I mentioned in the code snippet - having to get strings and parse them into <code>DateTime</code> requires that you do some additional error checking on your part - it's a pain, but I think it's necessary to make sure your code doesn't break the first time someone enters no date or an invalid date format....</p>
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    1. POHow to send DateTime parameters to WCF DataService
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    1. COThanks I guess that the way to do it
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