Functional C# by Wisnu Anggoro

Author:Wisnu Anggoro [Anggoro, Wisnu]
Language: eng
Format: mobi, epub
Publisher: Packt Publishing
Published: 2016-12-29T16:00:00+00:00

As you can see, we have an ordered sequence now, but the sorting key is the last character of each element. This is achieved with the help of our custom comparer. Unfortunately, the custom comparer is only available using the fluent syntax. In other words, we can't use it in the query expression method.

When we sort the sequence, we can have more than one comparer as a condition. We can use the ThenBy extension method for the second condition after we call the OrderBy method. Let's take a look at the following code to demonstrate this:

public partial class Program { public static void OrderByThenByOperator() { IEnumerable<string> query = nameList .OrderBy(n => n.Length) .ThenBy(n => n); foreach (string s in query) { Console.WriteLine(s); } } }

From the preceding code, we sort the sequence by the length of each element, and then we sort the result alphabetically. If we call the OrderByThenByOperator() method, we will get the following output:

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