Determines whether an element is in an Array.

Several years ago, Insus. NET tried to convert Array to the IList interface and then used the IList. Contains () method.
At that time, some objections were raised.
Original blog: http://www.cnblogs.com/insus/archive/2011/12/16/2290093.html

Today Insus. NET when learning MSDN, re-see this problem, the original Array in.. NET Framework 3.5, the IList interface has been explicitly implemented. NET Frameork version. You can directly use this method.

In the testing environment earlier than. NET Framework3.5, this IList interface was only manually implemented.

Let's take a look at their changes: