The specified type member 'Date' is not supported in LINQ to Entities Exception

entity-framework linq-to-entities
nebula picture nebula · Jul 22, 2012 · Viewed 71.2k times · Source

I got a exception while implementing the following statements.

 DateTime result;
 if (!DateTime.TryParse(rule.data, out result))
     return jobdescriptions;
 if (result < new DateTime(1754, 1, 1)) // sql can't handle dates before 1-1-1753
     return jobdescriptions;
 return jobdescriptions.Where(j => j.JobDeadline.Date == Convert.ToDateTime(rule.data).Date );

Exception

The specified type member 'Date' is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported.

I know what the exception means but i don't know how to get rid of it. Any help?

Answer

Slauma picture Slauma · Jul 22, 2012

You can use the TruncateTime method of the EntityFunctions to achieve a correct translations of the Date property into SQL:

using System.Data.Objects; // you need this namespace for EntityFunctions

// ...

DateTime ruleData = Convert.ToDateTime(rule.data).Date;
return jobdescriptions
    .Where(j => EntityFunctions.TruncateTime(j.JobDeadline) == ruleData);


Update: EntityFunctionsis deprecated in EF6, Use DbFunctions.TruncateTime

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