Finding the Index of First Element of the Specified Sequence in C#

Last Updated : 28 Nov, 2019

The Index Structure is introduced in C# 8.0. It represents a type that can be used to index a collection or sequence and it can be started from the start or the end. You are allowed to find the index, which points the first element of the specified collection or sequence with the help of Start Property provided by the Index struct.

Syntax:

public static property Index Start { Index get(); };

Example 1:

// C# program to illustrate the 
// concept of the start index 
using System; 
  
namespace example { 
  
class GFG { 
  
    // Main Method 
    static void Main(string[] args) 
    { 
  
        // Creating new indexes 
        // Using Index() constructor 
        var in1 = new Index(1, true); 
        var in2 = new Index(3, false); 
  
        // Get the start index 
        var res1 = Index.Start; 
  
        // Displaying the index 
        Console.WriteLine("Index: {0}", in1); 
        Console.WriteLine("Index: {0}", in2); 
        Console.WriteLine("Start Index: {0}", res1); 
    } 
} 
} 

Output:

Index: ^1
Index: 3
Start Index: 0

Example 2:

// C# program to illustrate the 
// concept of the start index 
using System; 
  
namespace example { 
  
class GFG { 
  
    // Main Method 
    static void Main(string[] args) 
    { 
  
        // Creating and initializing an array 
        string[] greetings = new string[] {"Hello", "Hola", "Namaste",  
                                "Bonjour", "Ohayo", "Ahnyounghaseyo"}; 
  
        // Get the end index 
        var res = Index.Start; 
  
        // Checking the given index  
        // is the start index or not 
        if (res.Equals(0) == true) { 
  
            Console.WriteLine("The given index is start index"+ 
                      " and the element is " + greetings[res]); 
        } 
  
        else { 
  
            Console.WriteLine("The given index is not the start index "); 
        } 
    } 
} 
} 

Output:

The given index is start index and the element is Hello

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