Range Type in C# 8.0

This tutorial will show you how to use Range Type in C# 8.0 version

For example in old version C#

static void Main(string[] args)
{
    var arrays = new string[] 
    {
        "Product 1",
        "Product 2",
        "Product 3",
        "Product 4", 
        "Product 5",
        "Product 6"
    }; 
    for(int i=1; i <= 4; i++)
    {
        Console.WriteLine(arrays[i]);
    } 
    Console.ReadLine();
}

You can rewrite the code above in C# 8.0 using Range as the following

foreach (var item in arrays[1..3])
{
    Console.WriteLine(item);
}

Or you can write from an index to the end

foreach (var item in arrays[1..])
{
    Console.WriteLine(item);
}

From the start to an index

foreach (var item in arrays[..3])
{
    Console.WriteLine(item);
}

Or Entire range

foreach (var item in arrays[..])
{
    Console.WriteLine(item);
}

From index to X from the end

foreach (var item in arrays[1..^1])
{
    Console.WriteLine(item);
}

You can install Range Type, then you can write

Range range = 1..4; 
foreach (var item in arrays[range])
{
    Console.WriteLine(item);
}

Range support two new operators ('^' and '..') which allows building System.Index and System.Range objects and using them to index or slice collections at runtime.