- Trending Categories
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
What is the difference between Select and SelectMany in Linq C#?
Select operator produces one result value for every source SelectMany Operator belong to Projection Operators category. It is used to project each element of a sequence to an IEnumerable and flattens the resulting sequences into one sequence.
Example
class Demo{ public string Name { get; set; } public List<string> Contents { get; set; } public static List<Demo>GetAllContents(){ List<Demo> listContents = new List<Demo>{ new Demo{ Name = "Cap", Contents = new List<string> { "Nike", "Adidas" } }, new Demo{ Name = "Shoes", Contents = new List<string> { "Nike", "Puma", "Adidas" } }, }; return listContents; } } class Program{ static void Main(){ IEnumerable<List<string>> result = Demo.GetAllContents().Select(s => s.Contents); foreach (List<string> stringList in result){ foreach (string str in stringList){ Console.WriteLine(str); } } Console.WriteLine("---Select Many---") IEnumerable<string> resultSelectMany = Demo.GetAllContents().SelectMany(s => s.Contents); foreach (string str in resultSelectMany){ Console.WriteLine(str); } Console.ReadKey(); } }
Output
Nike Adidas Nike Puma Adidas ---Select Many--- Nike Adidas Nike Puma Adidas
Advertisements