Range Structure in C# 8.0

C# 8.0 introduced a new predefined structure that is known as Range struct. This struct is used to represent a range that has a start and end indexes. It provides a new style to create a range using .. operator. This operator is used to create a range that has a starting and ending index. Also with the help of the Range struct you are allowed to create a variable of the range type.

C#

// C# program to illustrate how to create ranges
using System;

namespace range_example {

class GFG {

    // Main Method
    static void Main(string[] args)
    {
        int[] marks = new int[] {23, 45, 67, 88, 99,
                            56, 27, 67, 89, 90, 39};

        // Creating variables of range type
        // And initialize the range
        // variables with a range
        // Using .. operator
        Range r1 = 1..5;
        Range r2 = 6..8;

        var a1 = marks[r1];
        Console.Write("Marks List 1: ");
        foreach(var st_1 in a1)
            Console.Write($" {st_1} ");

        var a2 = marks[r2];
        Console.Write("\nMarks List 2: ");
        foreach(var st_2 in a2)
            Console.Write($" {st_2} ");

        // Creating a range
        // Using .. operator
        var a3 = marks[2..4];
        Console.Write("\nMarks List 3: ");
        foreach(var st_3 in a3)
            Console.Write($" {st_3} ");

        var a4 = marks[4..7];
        Console.Write("\nMarks List 4: ");
        foreach(var st_4 in a4)
            Console.Write($" {st_4} ");
    }
}
}

Output:

Marks List 1:  45  67  88  99 
Marks List 2:  27  67 
Marks List 3:  67  88 
Marks List 4:  99  56  27

Constructor 

Constructor	Description
Range(Index, Index)	This constructor is used to create a new Range instance with the specified starting and ending indexes.

Properties

Property	Description
All	This property is used to get a Range object that starts from the first element to the end.
End	This property is used to get an Index that represents the exclusive end index of the range.
Start	This property is used to get the inclusive start index of the Range.

Methods 

Method	Description
EndAt(Index)	This method is used to create a Range object starting from the first element in the collection to a specified end index.
Equals()	This method is used to check whether the current range is equal to a specified range.
GetHashCode()	This method is used to find the hash code for this instance.
GetOffsetAndLength(Int32)	This method is used to calculate the start offset and length of the given range object with the help of a collection length.
StartAt(Index)	This method is used to create a new Range instance starting from a specified start index to the end of the collection.
ToString()	This method returns the string representation of the current Range object.