NP65 BinarySearch() method

Question

Hi Guys NP65 BinarySearch () method Following simple program shows the way implementation of BinarySearch () method. http://www.java2s.com/Tutorial/CSharp/0220__Data-Structure/MethodsDefinedbyArray.htm But in the above website BinarySearch () method has been shown in the following way. What does this mean and how can this be implemented. public static int BinarySearch(Array a object v) Anyone knows please explain the reason. Thank you using System; public class BinarySearchDemo { public static void Main () { int [] idNumbers = { 122 167 204 219 345 }; int entryId = 204; int x = Array . BinarySearch (idNumbers entryId); Console .WriteLine( ID {0} position {1}  entryId x); } }

Maha · Answer

Thank you for the explanation Alan.

Alan · Answer

To call a method in C# you need to know a number of things about it: 1. Its name and accessibility - public protected private etc. 2. Whether its instance or static. 3. Its return type - void int string etc 4. The number type and order of its parameters and whether they're ref out params or just 'by value' (the default). 5. In the case of a generic method its type parameters(s) and any constraints thereon. So the page you're looking at is just telling you the 'signatures' of the methods of the array class so that you know what is needed to call them in practice.

Maha · Answer

So public static int BinarySearch (Array a object v) is helping merely to explain the content within. It won’t provide any help to built-up relevant code x = Array.BinarySearch(idNumbers entryId); There are many methods like this in the web page. I mean one can’t built-up a relevant code from such a method.

Maha · Answer

Thank you Alan

Alan · Answer

This line is just how the BinarySearch method is declared in the Array class. public static int BinarySearch(Array a object v) As it's static and returns an int you'd call it in practice with a line like this: int x = Array.BinarySearch(idNumbers entryId); So there's no inconsistency here.