C# Sort KeyValuePair List: CompareTo

Sort KeyValuePair structs in a List with CompareTo. Use a Comparison delegate.

Sort KeyValuePair List. A List contains many KeyValuePair struct instances. It can be sorted with the Sort List method. This requires Comparison delegate implementations. We implement these as static int methods that call CompareTo.Comparison CompareTo Sort

This example code introduces 3 static methods. Compare1 receives two KeyValuePair structs and returns the result of CompareTo on their Key. Compare2 returns the CompareTo of the Value. And in the Main entry point control flow begins.KeyValuePair

Main: A new List of KeyValuePair instances is created. Three KeyValuePairs are created and added to the List.

Next: The List is sorted with Compare1. The method target Compare1 is accepted as a Comparison delegate.

Then: After printing the List, we sort it again with Compare2, and finally display the List again.

List Console

C# program that sorts List of KeyValuePair instances using System; using System.Collections.Generic; class Program { static int Compare1(KeyValuePair<string, int> a, KeyValuePair<string, int> b) { return a.Key.CompareTo(b.Key); } static int Compare2(KeyValuePair<string, int> a, KeyValuePair<string, int> b) { return a.Value.CompareTo(b.Value); } static void Main() { var list = new List<KeyValuePair<string, int>>(); list.Add(new KeyValuePair<string, int>("Perl", 7)); list.Add(new KeyValuePair<string, int>("Net", 9)); list.Add(new KeyValuePair<string, int>("Dot", 8)); // Use Compare1 as comparison delegate. list.Sort(Compare1); foreach (var pair in list) { Console.WriteLine(pair); } Console.WriteLine(); // Use Compare2 as comparison delegate. list.Sort(Compare2); foreach (var pair in list) { Console.WriteLine(pair); } } } Output [Dot, 8] [Net, 9] [Perl, 7] [Perl, 7] [Dot, 8] [Net, 9]

The results reveal the effects of the Comparison delegates. The List.Sort(Compare1) call sorts the List by the Key of the KeyValuePair. And the List.Sort(Compare2) call sorts the List by the Value int.Sort List

Summary. With this example program, we implemented one way of sorting collections of KeyValuePair instances. You can use other syntax forms and implementations, such as LINQ expressions or lambda expressions, to accomplish this task as well.orderby Lambda

The Dev Codes

.Net

.NET Array Dictionary List String 2D Async DataTable Dates DateTime Enum File For Foreach Format IEnumerable If IndexOf Lambda LINQ Parse Path Process Property Regex Replace Sort Split Static StringBuilder Substring Switch Tuple

Java

Core Array ArrayList HashMap String 2D Cast Character Console Deque Duplicates File For Format HashSet If IndexOf Lambda Math ParseInt Process Random Regex Replace Sort Split StringBuilder Substring Switch Vector While

Related Links

Adjectives Ado Ai Android Angular Antonyms Apache Articles Asp Autocad Automata Aws Azure Basic Binary Bitcoin Blockchain C Cassandra Change Coa Computer Control Cpp Create Creating C-Sharp Cyber Daa Data Dbms Deletion Devops Difference Discrete Es6 Ethical Examples Features Firebase Flutter Fs Git Go Hbase History Hive Hiveql How Html Idioms Insertion Installing Ios Java Joomla Js Kafka Kali Laravel Logical Machine Matlab Matrix Mongodb Mysql One Opencv Oracle Ordering Os Pandas Php Pig Pl Postgresql Powershell Prepositions Program Python React Ruby Scala Selecting Selenium Sentence Seo Sharepoint Software Spellings Spotting Spring Sql Sqlite Sqoop Svn Swift Synonyms Talend Testng Types Uml Unity Vbnet Verbal Webdriver What Wpf

TheDeveloperBlog.com

C# Sort KeyValuePair List: CompareTo

Related Links:

.Net

Java

Related Links