Query a Sequence using LINQ

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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

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About The Author

Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.