LINQ to SQL and Null strings, how do I use Contains?

Question

Here is the query

from a in this._addresses
where a.Street.Contains(street) || a.StreetAdditional.Contains(streetAdditional)
select a).ToList
(         


        

Answer 1

Check to make sure that the properties are not null

from a in this._addresses
where (a.Street != null && a.Street.Contains(street)) || 
(a.StreetAdditional != null && a.StreetAdditional.Contains(streetAdditional))
select a).ToList<Address>()

If the null check is false, then the second clause after the && will not evaluate.

Answer 2

One thing to note is that the null should be evaluated first.

where (**a.Street != null** && a.Street.Contains(street)) || (a.StreetAdditional != null && a.StreetAdditional.Contains(streetAdditional))
select a).ToList<Address>

()

Answer 3

from a in this._addresses
where a.Street.Contains(street) || (a.StreetAdditional != null && a.StreetAdditional.Contains(streetAdditional)
select a).ToList<Address>()