What are element operators?

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Element operators return a single element or a specific element from a collection. The elements operators are Single, SingleOrDefault, First, FirstOrDefault, Last, LastOrDefault.

List < int > data = new List < int > {
	10, 20, 30, 40, 50
};
//Try to get element at specified position
Console.WriteLine(data.ElementAt(1)); //result:20
//Try to get element at specified position if exist, else returns default value
Console.WriteLine(data.ElementAtOrDefault(10)); //result:0, since default value is 0
Console.WriteLine(data.First()); //result:10
Console.WriteLine(data.Last()); //result:50
//try to get first element from matching elements collection
Console.WriteLine(data.First(d = > d <= 20)); //result:10
//try to get first element from matching elements collection else returns default value
Console.WriteLine(data.SingleOrDefault(d = > d >= 100)); //result:0, since default value is 0
//Try to get single element
// data.Single();
//Exception:Sequence contains more than one element
//Try to get single element if exist otherwise returns default value
// data.SingleOrDefault();
//Exception:Sequence contains more than one element
//try to get single element 10 if exist
Console.WriteLine(data.Single(d = > d == 10)); //result:10
//try to get single element 100 if exist otherwise returns default value
Console.WriteLine(data.SingleOrDefault(d = > d == 100)); //result:0, since default value is 0

 

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