来自 SQL Server 的日期和 C# DateTime 的比较

Question

I have a DateTime column in a SQL Server database. The data stored as follows:

2020-10-04 23:45:00.527

I tried to compare the date as follows with current date (Date in database should be less than current date)

 DateTime today = DateTime.Now.Date;

 var result = (from c in TableName
               where (c.Email == email) && 
                     c.Password == password && c.Status == 1 && 
                     c.ValidTill.Date <= today
               select c).ToList();

But unfortunately I get this exception

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

Even tried the below method, that doesn't seem to work:

DbFunctions.TruncateTime(c.ValidTill)

My comparison would be like this -

2020-10-04 23:45:00 (Datetime in database) <= 2020-10-10 23:00:00 (current date & time)

Answer 1

You don't need .Date

    c.ValidTill <= today

or comparing only with date

    EntityFunctions.TruncateTime(x.ValidTill) <= today.Date

needs to do the work.

Answer 2

 var today = DateTime.Now;
 var result = (from c in TableName
               where (c.Email == email) && 
                     c.Password == password && c.Status == 1 && 
                     c.ValidTill <= today
               select c).ToList();

hope it will work.