Query a Sequence using LINQ

In one of my previous posts, we saw how to Generate Sequence of Float Numbers within a Range using LINQ. In this post, let us see how to query this sequence and extract elements based on a condition

Find First Number in the Sequence

var frstNo = rng.First();
Console.WriteLine("First Number: {0}", frstNo);

Find Last number in the Sequence

var lastNo = rng.Last();
Console.WriteLine("Last Number: {0}", lastNo);

Find First number in a Filtered Sequence

var frstFiltered = rng.Where(n => n > 20).FirstOrDefault();
Console.WriteLine("First Number Greater than 20: {0}", frstFiltered);

Find Last number in a Filtered Sequence

var lastFiltered = rng.Where(n => n < 22).LastOrDefault();
Console.WriteLine("Last Number Lesser than 22: {0}", lastFiltered);

Find Number at a Specified Index

var numIndex = rng.ElementAtOrDefault(15);
Console.WriteLine("Element at index 15: {0}", numIndex);

Here’s the entire code:

OUTPUT