The ElementAt and ElementAtOrDefault methods of LINQ, linqfirstordefault

The ElementAt and ElementAtOrDefault methods of LINQ, linqfirstordefault

Both methods return the elements of the specified index in the set. The difference is that the former throws an exception when no result is returned, while the latter returns the default value if no result is returned.

Example:



In this example, the red number is the index of the Set, which starts from 0.
As long as you know that it starts from 0, the following two methods, the parameters of ElementAt and ElementAtOrDefault, are these indexes.