Csharp/CSharp Tutorial/Data Structure/Array Exist Find

Demonstrate Predicate delegate

<source lang="csharp">using System;

class MainClass {

 static bool isCriteria(int v) { 
   if(v > 1) 
     return true; 
   return false; 
 } 

 public static void Main() {      
   int[] nums = { 1, 4, -1, 5, -9 }; 
   
   Console.Write("Contents of nums: ");  
   foreach(int i in nums)   
     Console.Write(i + " ");  
   Console.WriteLine();  
 
   if(Array.Exists(nums, isCriteria)) { 
     Console.WriteLine("nums contains a negative value."); 

     // Now, find first negative value. 
     int x = Array.Find(nums, isCriteria); 
     Console.WriteLine("First negative value is : " + x); 
   } 
 }      

}</source>

Contents of nums: 1 4 -1 5 -9
nums contains a negative value.
First negative value is : 4