C# dictionary
- Similar to a hashtable, a dictionary will store its value in a key-value pair.
- We can then use the key to retrieve the value.
Defining a Dictionary CSharp
- From the Microsoft Documentation the Dictionary is defined like the below code.
Dictionary<TKey, TValue>()
- Need to specify the types of both our keys and values in the declaration.
- We have a lot of flexibility but not the flexibility that we had in a hash table.
Dictionary<int, string> myDictionary = new Dictionary<int, string>();
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In Above Code, the key will be of type integer, and the value will be of type string
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To use dictionaries, we need to include the below code.
using System.Collection.Generics;
- If you want to Add Elements in your Dictionary, then use the
Add()method to add key/value pairs in your Dictionary
myDictionary.Add(1, "Hello");
dictionary c# example
using System; using System.Collections.Generic; class DictionaryTest { static public void Main() { Dictionary < string, double > myDict = new Dictionary < string, double > (); myDict.Add("#1", 111); myDict.Add("#2", 222); myDict.Add("#3", 333); if (myDict.ContainsKey("#2")) { double value = myDict["#2"]; Console.WriteLine(value); } } } // 222
c# dictionary example
using System; using System.Collections.Generic; class DictionaryTest { static public void Main() { Dictionary < int, string > books = new Dictionary < int, string > (); books.Add(1, "The Paper Palace: A Novel"); books.Add(2, "Things Fall Apart"); books.Add(3, "The Handmaid's Tale: The Graphic Novel"); Dictionary < string, object > user = new Dictionary < string, object > () { { "id", 1 }, { "name", "Adam" }, { "age", 21 } }; Console.Write(books[1]); Console.WriteLine("\n"); Console.Write(user["name"]); } } // The Paper Palace: A Novel // Adam