c# 4.0 - Can't get EntityFunctions.TruncateTime() to work -

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i using entity framework code first. using linq entity want grab record based on datetime value. here current code:

/// <summary> /// method check , see if parsed game exists on /// database. if yes, true returned, otherwise false returned. /// </summary> /// <param name="context">the db context use</param> /// <param name="hometeam">the name of home team game.</param> /// <param name="awayteam">the name of away team game.</param>         /// <param name="date">the date of game</param> /// <returns></returns> public bool doesgamealreadyexist(pcontext context, string hometeam, string awayteam, string date) {     string dtobjformat = "dd mmm yyyy";     datetime dt;     datetime.tryparseexact(date, dtobjformat, cultureinfo.invariantculture, datetimestyles.none, out dt);     var result = context.games.where(x => entityfunctions.truncatetime(x.start) == dt.date).firstordefault();     return result != null;  }

the above code throws following error:

    linq entities not recognize method 'system.nullable`1[system.datetime] truncatetime(system.nullable`1[system.datetime])' method, , method cannot translated store expression.

i tried following code, , same error:

var result = context.games.where(x => entityfunctions.truncatetime(x.start) == entityfunctions.truncatetime(dt.date)).firstordefault();

what doing wrong?

i faced problem when upgraded web application entity framework 5 entity framework 6. then, realized system.data.entity dll needs removed application in order work entity framework 6. entity framework 6 not part of .net framework anymore , therefore independent of system.data.entity dll. in order truncate time, need use system.data.entity.dbfunctions.truncatetime(...) method entityframework.dll. yes, solved problem.

bottom line : if using entity framework 6, first remove reference system.data.entity dll , then, in code, replace entityfunctions.truncatetime(..) system.data.entity.dbfunctions.truncatetime(...). [ entityframework.dll ]


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