Linq code to select one item

Question

I find myself writing a lot of code like this to select one item that matches

var item = (from x in Items where x.Id == 123 select x).First(); 

Is there a cleaner way of doing it or is this as concise as I'm going to get?

EDIT: Should have said "Cleaner way using linq syntax". I was already aware of the lambda syntax and it's starting to look like this is actually the only way. I did get some useful info though, so thanks to everyone who replied.

Answer 1

Depends how much you like the linq query syntax, you can use the extension methods directly like:

var item = Items.First(i => i.Id == 123); 

And if you don't want to throw an error if the list is empty, use FirstOrDefault which returns the default value for the element type (null for reference types):

var item = Items.FirstOrDefault(i => i.Id == 123);  if (item != null) {     // found it } 

Single() and SingleOrDefault() can also be used, but if you are reading from a database or something that already guarantees uniqueness I wouldn't bother as it has to scan the list to see if there's any duplicates and throws. First() and FirstOrDefault() stop on the first match, so they are more efficient.

Of the First() and Single() family, here's where they throw:

• First() - throws if empty/not found, does not throw if duplicate
• FirstOrDefault() - returns default if empty/not found, does not throw if duplicate
• Single() - throws if empty/not found, throws if duplicate exists
• SingleOrDefault() - returns default if empty/not found, throws if duplicate exists

Answer 2

FirstOrDefault or SingleOrDefault might be useful, depending on your scenario, and whether you want to handle there being zero or more than one matches:

FirstOrDefault: Returns the first element of a sequence, or a default value if no element is found.

SingleOrDefault: Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence

I don't know how this works in a linq 'from' query but in lambda syntax it looks like this:

var item1 = Items.FirstOrDefault(x => x.Id == 123); var item2 = Items.SingleOrDefault(x => x.Id == 123);