Linq – The specified type member ‘Date’ is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties

entity-framework-4linqlinq-to-entities

Using this code in Entity Framework I receive the following error. I need to get all the rows for a specific date, DateTimeStart is of type DataType in this format 2013-01-30 12:00:00.000

Code:

 var eventsCustom = eventCustomRepository.FindAllEventsCustomByUniqueStudentReference(userDevice.UniqueStudentReference)
                    .Where(x =>  x.DateTimeStart.Date == currentDateTime.Date);

Error:

base {System.SystemException} = {"The specified type member 'Date' is
not supported in LINQ to Entities. Only initializers, entity members,
and entity navigation properties are supported."}

Any ideas how to fix it?

Best Answer

DateTime.Date cannot be converted to SQL. Use EntityFunctions.TruncateTime method to get date part.

var eventsCustom = eventCustomRepository
.FindAllEventsCustomByUniqueStudentReference(userDevice.UniqueStudentReference)
.Where(x => EntityFunctions.TruncateTime(x.DateTimeStart) == currentDate.Date);

UPDATE: As @shankbond mentioned in comments, in Entity Framework 6 EntityFunctions is obsolete, and you should use DbFunctions class, which is shipped with Entity Framework.

Related Solutions

Entity-framework – Only initializers, entity members, and entity navigation properties are supported

Entity is trying to convert your Paid property to SQL and can't because it's not part of the table schema.

What you can do is let Entity query the table with no Paid filter and then filter out the not Paid ones.

public ActionResult Index()
{
    var debts = storeDB.Orders
        //.Where(o => o.Paid == false)
        .OrderByDescending(o => o.DateCreated);

    debts = debts.Where(o => o.Paid == false);

    return View(debts);
}

That, of course, would mean that you bringing all of the data back to the web server and filtering the data on it. If you want to filter on the DB server, you can create a Calculated Column on the table or use a Stored Procedure.

C# – ‘Date’ is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported

If you are using EF 6.0+, you can use DbFunctions.TruncateTime(DateTime?) :

var query =
    from t in context.Logs
    where t.Title == title 
    && DbFunctions.TruncateTime(t.Timestamp) == LogDate.Date
    select t;

Note: For earlier version of EF where DbFunctions isn't available, EntityFunctions.TruncateTime(DateTime?) can be used instead.

Best Answer

Related Solutions

Entity-framework – Only initializers, entity members, and entity navigation properties are supported

C# – ‘Date’ is not supported in LINQ to Entities. Only initializers, entity members, and entity navigation properties are supported

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