convert string to DateTime in linq query with where clause?

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I am try to get user list using EF. and I have one filed in the table it's return date as a string data type. Now I'm compare this return date to Today's date then I'm getting error.so any one idea how can do that convert string to datetime in C#.

Here's the query:

var res = db.users
  .Where(a => Convert.ToDateTime(a.returndate) > DateTime.Now)
  .ToList(); // but here not getting list

So it's possible in EF string to DateTime conversion. If anyone has an idea please let me know.

You can not use Convert.ToDatetime method in LINQ to Entities, so first get data from db then use method on list

var res = db.users.ToList().Where(a => DateTime.ParseExact(a.returndate,"dd-MM-yyyy",CultureInfo.InvariantCulture) > DateTime.Now).ToList();

NOTE: If you can change your columns data type to DateTime type then you can compare them in LINQ To Entities, otherwise you should do as above

[SOLVED], You need to first materialize the query (i.e. load the data) to your application and then parse it. Entity Framework doesn't know how to execute . var res = db.users.ToList().Where(a => DateTime.ParseExact(a.returndate,"dd-MM-yyyy",CultureInfo.InvariantCulture) > DateTime.Now).ToList(); NOTE: If you can change your columns data type to DateTime type then you can compare them in LINQ To Entities, otherwise you should do as above

As per your comments to question you need to do

var res = db.users.ToList().Where(a => DateTime.ParseExact(a.returndate, "dd-MM-yyyy", CultureInfo.InvariantCulture) > DateTime.Now);

In your case Convert.ToDateTime(string str) is not working as passed DateTime format is different from your System's format.

BTW,

....EF string to DateTime conversion.

Never ever store DateTime strings in database. Databases have corresponding DateTime types where you can store information as DateTime itself. That way when bringing values you don't have to repeat the code.

Converting to DateTime in where clause in Data Access, formerly , Please note that the SQL statement in this case is specific to MS SQL Server and the TO_DATE function in oracle to convert string values to datetime values. You can call the TO_DATE function in oracle to convert string values to datetime values. This would look like this: var q = DataContext.LOCATIONs.Where (m => "to_date ({0}, 'yyyy/mm/dd') >= {1}".SQL<bool> (m.CL8, startDateTime)); You can find more details about the TO_DATE function here.

With current schema you can only get list of all objects and then filter it.

Linq to Entities constructs SQL query which is executed when enumeration is done.

So just get full list, then filter it. Or database schema changing is strongly recommended.

UPDATE

var res = db.users.ToList().Where(a => DateTime.ParseExact(a.returndate, "dd-MM-yyyy", CultureInfo.InvariantCulture) > DateTime.Now); 

But full table is loaded before filtration. So u need to change your field type to datetime. Then u can use simple comparison inside Where.

@NikhilAgrawal also updated his answer in a right way. )

How to convert string datatype column value to DateTime in format , How to convert string datatype column value to DateTime in format dd/MM/yyyy in LINQ query Statement [Answered]RSS. 4 replies. Last post Sep  Convert int to DateTime Linq where Clause EF6. I am not using SSAS but rather Linq query to read the data into DataTable. string cdrlName, string cdrlNumber

Try This :

var res = db.users.where(a => DateTime.ParseExact(a.returndate,"dd-MM-yyyy",CultureInfo.InvariantCulture) > DateTime.now).ToList();

[SOLVED], The DateTimeColumn2 is in DateTime datatype in the database, but user input string, therefore Iam converting DateTimeColumn2 to string and  The dynamic linq library works only for integers and not strings, or atleast I have not seen any samples using string. There are so many articles and blogs on this subject, and all of them use integers as example! The AccountId I have to query is a string. – user466663 Mar 13 '12 at 15:54

In LINQ Query convert the string to datetime and check with today's , Where statement would be: DateTime dtFrom = Convert.ToDateTime(sFrom ); var something = TransRepository.Entities.Where(x => x.Date >= dtFrom) ; /i had a  Linq WhereClause String to Linq AsQueryable Statement .net Core - C# [Answered] RSS 1 reply Last post Sep 20, 2018 02:57 AM by micnie2020

Datetime variables in WHERE clause ! - MSDN, this should be an easy one for people that use LINQ to ENTITIES I have a WHERE clause which has a DATETIME parameter in it. I keep getting an error I use a text query and not a queryobject. I tried using There is no need to convert the date to a string or to worry too much about different cultures:. Hi BermudaLamb, LINQ(Language Integrated Query) is the new feature in .NET3.5 and it makes it possible to access different data sources withe the same syntax.So in LINQ we use select, where, group as well but a little different syntax.

[Solved] Compare Datetime in Linq Query, String, System.IFormatProvider)' method, and this method cannot be translated into a store expression. Posted 4-Oct-13  First you do your normal LINQ query where you just get that DateTime, here is an example. var vDates = (from d in oForm.tblSchedule select new { scheduleDate = EntityFunctions.TruncateTime(d.dtSchedule) }) .Distinct(); Now here comes the fix. Use something like the ToList() so that it iterates on it and is no longer in SQL. Now you can use your

Comments
  • What is the value of a.returndate?
  • DD-MM-YYYY this format it's store
  • shouldn't it be DD-MM-YYYY instead of DD-MM-YYY?
  • "then I'm getting error" - what error? And do you have to use a text representation in the database to start with? If you could change the database to use a more sensible field type, all code dealing with it is likely to get better...
  • with your solution i'm getting like this error 'String was not recognized as a valid DateTime'.
  • fetching the whole table to filter the data within the application is bad practice
  • @fubo yer you are right, if this table contains very big data
  • so guys what is the best wave for that issue to fix?
  • @coderwill the best way to fix this issue is to have the correct data type in the database column. The next best way would be to use the date as a string in ISO format (yyyy-MM-dd HH:mm:ss), so you can at least compare the text representation without conversion.
  • LINQ to Entities does not recognize the method 'System.DateTime ParseExact(System.String, System.String, System.IFormatProvider)' method, and this method cannot be translated into a store expression. i m getting this error.