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PODatetime.Now cached in a .NET compiled LINQ query
 

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    <p>Inside a compiled LINQ query as a condition part, I was using Datetime.Now . It used to give me irrelevant results. I think it used to store same Datetime.Now value for few subsequent calls. To solve this issue I send Datetime.Now as a value parameter to the compiled query and it is working fine.</p> <p><strong>Old Code</strong> </p> <pre><code> event.EventEnd &gt;= Datetime.Now </code></pre> <p><strong>New Code</strong> </p> <pre><code> event.EventEnd &gt;= currentTime </code></pre> <p>Where currentTime is a variable contains Datetime.Now value received outside from compiled query.</p> <p>Please let me know if this is the default behavior of complied LINQ query or I was wrong somewhere </p> <p>Platform : ASP.NET 4.0, MVC 2.0 </p> <p>Irrelevant results means , say we have one record with eVent.EventEnd value is 10-10-10 02:10 PM , if I run the query at 10-10-10 02:00 PM , we get that record in the result. If I run the query at 10-10-10 03:00 PM also we get that record in result. Which is wrong. But after I use the variable instead on DateTime.Now , it is working fine.</p> <p>Compiled LINQ Query</p> <pre><code>public static Func&lt;DataContext, CommonParams, string, DateTime, IQueryable&lt;EventEntity&gt;&gt; GetEventsByOwnerID = CompiledQuery.Compile( (DataContext context, CommonParams inputParams, string eventType, DateTime currentTime ) =&gt; (from eVent in context.Events join categories in context.Categories on eVent.CategoryID equals categories.CategoryID where !eVent.IsDeleted &amp;&amp; eVent.OwnerID == inputParams.UserID &amp;&amp; (eventType == "ALL" || (eventType == "CURRENT" &amp;&amp; eVent.EventEnd &gt;= currentTime) || (eventType == "OLD" &amp;&amp; eVent.EventEnd &lt; currentTime)) orderby eVent.PostedOn descending select new EventEntity() { EventID = eVent.EventID, CategoryID = eVent.CategoryID, Title = eVent.Title, Owner = eVent.OwnerName, EventStart = eVent.EventStart, EventEnd = eVent.EventEnd, Host = eVent.Host, Location = eVent.Location, Description = eVent.Description, Email = eVent.Email, URL = eVent.URL, Phone = eVent.Phone, CategoryName = categories.CategoryName, ProgramName = eVent.ProgramName, IsTelevised = eVent.IsTelevised, ChannelName = eVent.ChannelName, CityID = eVent.CityID, CountryID = eVent.CountryID, IsActive = eVent.IsActive, OwnerID = eVent.OwnerID, IsEndTimePartEmpty = eVent.IsEndTimePartEmpty, IsStartTimePartEmpty = eVent.IsStartTimePartEmpty, IsDeleted = eVent.IsDeleted, ThumbnailURL = eVent.ThumbnailURL, AttendeeCount = eVent.AttendeeCount, CommentsCount = eVent.CommentsCount }) ); </code></pre>
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    1. USskaffman
    1. USJomy John
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    1. COWhat do you mean by irrelevant results? Can you post the entire query? I think we need more information here.
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      1. USGerrie Schenck
    2. COIs this a database query? Would it have been using the database server's date and time? Are the clocks in sync?
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    3. CO@RUP , Yes , DB server time is right.
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      1. USJomy John
 

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