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DateTime dt;
if(Request["OTime"] != null && DateTime.TryParse(Request["OTime"].Trim(), out dt)
{
express = express.And(t => t.OccourTime.Date == dt.Date);
//如果不行用下面这个
//express = express.And(t => System.Data.Linq.SqlClient.SqlMethods.DateDiffDay(t.OccourTime.Date, dt.Date)==0);
}