Searching if value exists in a list of objects using Linq

Question

Say I have a class Customer which has a property FirstName. Then I have a List.

Can LINQ be used to find if th

Answer 1

zvolkov's answer is the perfect one to find out if there is such a customer. If you need to use the customer afterwards, you can do:

Customer customer = list.FirstOrDefault(cus => cus.FirstName == "John");
if (customer != null)
{
    // Use customer
}

I know this isn't what you were asking, but I thought I'd pre-empt a follow-on question :) (Of course, this only finds the first such customer... to find all of them, just use a normal where clause.)

Answer 2

customerList.Any(x=>x.Firstname == "John")

Answer 3

Another possibility

if (list.Count(customer => customer.Firstname == "John") > 0) {
 //bla
}