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Dictionary Methods in C#
Dictionary is a collection of keys and values in C#. Dictionary<TKey, TValue> is included in the System.Collection.Generics namespace.
The following are the methods −
| Sr.No | Method & Description |
|---|---|
| 1 | Add Add key-value pairs in Dictionary |
| 2 | Clear() Remove all keys and values |
| 3 | Remove Removes the element with the specified key. |
| 4 | ContainsKey Checks whether the specified key exists in Dictionary<TKey, TValue>. |
| 5 | ContainsValue Checks whether the specified key value exists in Dictionary<TKey, TValue>. |
| 6 | Count Count the number of key-value pairs. |
| 7 | Clear Removes all the elements from Dictionary<TKey, TValue>. |
Let us see how to add elements into a Dictionary and display the count.
Example
using System;
using System.Collections.Generic;
public class Demo {
public static void Main() {
IDictionary<int, int> d = new Dictionary<int, int>();
d.Add(1,97);
d.Add(2,89);
d.Add(3,77);
d.Add(4,88);
d.Add(5,78);
d.Add(6,98);
Console.WriteLine(d.Count);
}
}Output
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Updated on: 23-Jun-2020
3K+ Views
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