Example 1: (Exists) Returns true if the list contains items matching the specified predicate.
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using System; using System.Collections.Generic; using System.Linq; class Program { static void Main(string[] args) { var list = new List<int> { 100,200,300,400,500,600,700}; bool result = list.Exists(x => x == 500); Console.WriteLine(result); Console.ReadLine(); } } |
Output:
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1 2 3 |
True |
Example 2: (Exists) Returns false if the list doesn’t contain items matching the specified predicate.
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using System; using System.Collections.Generic; using System.Linq; class Program { static void Main(string[] args) { var list = new List<int> { 100,200,300,400,500,600,700}; bool result = list.Exists(x => x > 500); Console.WriteLine(result); Console.ReadLine(); } } |
Output:
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1 2 3 |
True |
Example 3: (Find) Here we consider the Find() method on List. Find accepts a Predicate, which we can specify as a lambda expression. It returns the first match.
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using System; using System.Collections.Generic; using System.Linq; class Program { static void Main(string[] args) { var list = new List<int> { 100,200,300,400,500,600,700}; int result = list.Find(item => item > 180); Console.WriteLine(result); Console.ReadLine(); } } |
Output:
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1 2 3 |
200 |
Example 4: (FindLast) To search backwards, use the FindLast method. FindLast will scan the List from the last element to the first. Here we use FindLast instead of Find.
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using System; using System.Collections.Generic; using System.Linq; class Program { static void Main(string[] args) { var list = new List<int> { 100,200,300,400,500,600,700}; int result = list.FindLast(item => item > 180); Console.WriteLine(result); Console.ReadLine(); } } |
Output:
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1 2 3 |
700 |
Example 5: (FindIndex) FindIndex returns the index of the first matching element, starting its search from the first element.
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using System; using System.Collections.Generic; using System.Linq; class Program { static void Main(string[] args) { var list = new List<int> { 100,200,300,400,500,600,700}; int result = list.FindIndex(element => element >= 280); Console.WriteLine(result); Console.ReadLine(); } } |
