C# Union: Combine and Remove Duplicate Elements

Use the Union extension method from System.Linq to combine collections, removing duplicates.

Union. This computes mathematical unions. This extension method, from System.Linq, acts upon 2 collections. It returns a new collection that contains the elements that are found.Extension LINQ

Union removes duplicates. So this method can be thought of as two actions: it combines the two collections and then uses Distinct() on them, removing duplicate elements.Distinct

First, Union() is found in System.Linq. So you will want to include the appropriate using-directive. The Union method will work with 2 collections of the same type of elements.

Tip: Union works on Lists and arrays. We use integer arrays, but they could be string arrays or integer List types.

List Array

Thus: The Union of 1, 2, 3 and 2, 3, 4 is 1, 2, 3, 4. Elements are here compared for equality by Union using the default comparison logic.

C# program that invokes Union method using System; using System.Linq; class Program { static void Main() { // Create two example arrays. int[] array1 = { 1, 2, 3 }; int[] array2 = { 2, 3, 4 }; // Union the two arrays. var result = array1.Union(array2); // Enumerate the union. foreach (int value in result) { Console.WriteLine(value); } } } Output 1 2 3 4

Example 2. Union does not sort. The first example makes the result appear sorted, but this is due to already-sorted arrays. Here, I union two unsorted char arrays. The result is not sorted.Char Array Var Join

C# program that uses Union, unsorted chars using System; using System.Linq; class Program { static void Main() { char[] values1 = { 'a', 'z', 'c' }; char[] values2 = { 'c', 's' }; // Take union. var result = values1.Union(values2); Console.WriteLine(string.Join(",", result)); } } Output a,z,c,s

With Union, we combine collections. An imperative approach would involve a hash table or Dictionary. But the Union method can resolve duplicates automatically.

Please note the Intersect method. This returns only the shared elements in both collections it is called upon. It is similar to Union but with this important difference.Intersect

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# Union: Combine and Remove Duplicate Elements

Related Links:

.Net

Java

Related Links