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2 wrz 2024 · In C#, Dictionary is a generic collection which is generally used to store key/value pairs. The working of Dictionary is quite similar to the non-generic hashtable. The advantage of Dictionary is, it is generic type. Dictionary is defined under System.Collections.Generic namespace.
The following example shows how to create a dictionary and add key-value pairs. Example: Create Dictionary and Add Elements IDictionary < int , string > numberNames = new Dictionary < int , string >(); numberNames.Add(1, "One" ); //adding a key/value using the Add() method numberNames.Add(2, "Two" ); numberNames.Add(3, "Three" ); //The ...
Examples in Each Chapter. Our "Try it Yourself" editor makes it easy to learn C#. You can edit C# code and view the result in your browser.
A Dictionary is a generic collection that consists of elements as key/value pairs. In this tutorial, you will learn about the C# Dictionary with the help of examples.
Examples. The following code example creates an empty Dictionary<TKey,TValue> of strings with string keys and uses the Add method to add some elements. The example demonstrates that the Add method throws an ArgumentException when attempting to add a duplicate key.
In the above example, we are using the generic Dictionary<TKey, TValue> class. The Add () method is used to store the elements and the for-each loop is used to iterate the elements. To get the key and value, we are using the KeyValuePair class.
Dictionaries in C# all implement the IDictionary interface. There are several Dictionary types, but the most commonly used is the generic Dictionary, often referred to as Dictionary<TKey, TValue> - it holds a type-specific key and a corresponding type-specific value.
