LINQ to SQL in and not in

Question

What is in and not in equals in LINQ to SQL?

For example

select * from table in ( ...)
and 
select * from table not in (..)

What is equal to the above statement in LINQ to SQL?

Jural

Answer 1

You use, where <list>.Contains( <item> )

var myProducts = from p in db.Products
                 where productList.Contains(p.ProductID)
                 select p;

Or you can have a list predefined as such:

int[] ids = {1, 2, 3};

var query = from item in context.items
            where ids.Contains( item.id )
            select item;

For the 'NOT' case, just add the '!' operator before the 'Contains' statement.

Chaille

How do you handle if it's in a list? IN('a', 'b', 'c') – Jacobin

@Jacobin he just mentioned how you handle if it's in a list. – Fanni

this only equal to in clause what is for not in – Jural

See my updated statement for the 'NOT' condition. Essentially, you just need to add '!' before the Contains call. – Chaille

For .NET Version 3.5 have a look at blogs.msdn.microsoft.com/alexj/2009/03/25/… – Byrnie

Answer 2

I'm confused by your question. in and not in operate on fields in the query, yet you're not specifying a field in your example query. So it should be something like:

select * from table where fieldname in ('val1', 'val2')

or

select * from table where fieldname not in (1, 2)

The equivalent of those queries in LINQ to SQL would be something like this:

List<string> validValues = new List<string>() { "val1", "val2"};
var qry = from item in dataContext.TableName
          where validValues.Contains(item.FieldName)
          select item;

and this:

List<int> validValues = new List<int>() { 1, 2};
var qry = from item in dataContext.TableName
          where !validValues.Contains(item.FieldName)
          select item;

Fanni

Answer 3

Please Try This For SQL Not IN

var v = from cs in context.Sal_Customer
         join sag in context.Sal_SalesAgreement
         on cs.CustomerCode equals sag.CustomerCode
         where
          !(
               from cus in context.Sal_Customer
               join
               cfc in context.Sal_CollectionFromCustomers
               on cus.CustomerCode equals cfc.CustomerCode
               where cus.UnitCode == locationCode &&
                     cus.Status == Helper.Active &&
                     cfc.CollectionType == Helper.CollectionTypeDRF
               select cus.CustomerCode
           ).Contains(cs.CustomerCode) &&
           cs.UnitCode == locationCode &&
           cs.Status == customerStatus &&
           SqlFunctions.DateDiff("Month", sag.AgreementDate, drfaDate) < 36
           select new CustomerDisasterRecoveryDetails
           {
             CustomerCode = cs.CustomerCode,
             CustomerName = cs.CustomerName,
             AgreementDate = sag.AgreementDate,
             AgreementDuration = SqlFunctions.DateDiff("Month", sag.AgreementDate, drfaDate)
   };

Please Try This For SQL IN

context.Sal_PackageOrItemCapacity.Where(c => c.ProjectCode == projectCode && c.Status == Helper.Active && c.CapacityFor.Contains(isForItemOrPackage)).ToList();

Hemispheroid