Difference between FirstOrDefault() and SingleOrDefault() method in LINQ.

Difference between FirstOrDefault() and SingleOrDefault() method in LINQ.

FirstOrDefault() : Gets the first item that matches a given criteria.

 

     

var users = from user in dataContext.Users where user.Id==5 select user; var firstUser = users.FirstOrDefault();

SingleOrDefault() : If you specify this extension method that means you are specifically saying that there can be only one value that matches the criteria. If there are more than 1 value that matches the criteria, throw an exception. 

var users = from user in dataContext.Users where user.Id==5 select user; var singleUser = users.SingleOrDefault();