- 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
C# Program to find a key in Dictionary
Firstly, set a Dictionary collection with elements.
Dictionary<int, string> d = new Dictionary<int, string>() { {1,"Applianes"}, {2, "Clothing"}, {3,"Toys"}, {4,"Footwear"}, {5, "Accessories"} };
Now, let’s say you need to check whether key 5 exists or not. For that, use ContainsKey() method. It returns True if key is found.
d.ContainsKey(5);
Let us see the complete code.
Example
using System; using System.Collections.Generic; public class Program { public static void Main() { Dictionary<int, string> d = new Dictionary<int, string>() { {1,"Electronics"}, {2, "Clothing"}, {3,"Toys"}, {4,"Footwear"}, {5, "Accessories"} }; foreach (KeyValuePair<int, string> ele in d) { Console.WriteLine("Key = {0}, Value = {1}", ele.Key, ele.Value); } Console.WriteLine("Key 5 exists? "+d.ContainsKey(5)); } }
Output
Key = 1, Value = Electronics Key = 2, Value = Clothing Key = 3, Value = Toys Key = 4, Value = Footwear Key = 5, Value = Accessories Key 5 exists? True
Advertisements