Question

I an trying to build a simple search LINQ statement. As the strings are passed into the WHERE, the empty strings are causing false results.

tmp = (from p in tmp
       where
           p.Customer.custEmail.Contains(filter.Email) &&
           p.Customer.custLastName.Contains(filter.LastName) &&
           p.orderID == id
       select p).ToList();
}

If the filter.LastName is empty, the query still tries to find the “”, which results in NO RECORDS.

Without writing a bunch of

if (!String.IsNullOrWhiteSpace(filter.LastName))

for each Filter item, is there a way to do this within the LINQ command?

Answer 1

Just add the check to the where clause:

from p in tmp
where
    (!String.IsNullOrWhiteSpace(filter.Email) && 
     p.Customer.custEmail.Contains(filter.Email)) &&
    (!String.IsNullOrWhiteSpace(filter.LastName) &&
     p.Customer.custLastName.Contains(filter.LastName)) &&
    p.orderID == id
select p