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ContainsKey() method in C#
Set a Hashtable collection and add some elements to it.
Hashtable h = new Hashtable(); h.Add(1, "Sam"); h.Add(2, "Jack"); h.Add(3, "Andy"); h.Add(4, "Katie"); h.Add(5, "Beth"); h.Add(6, "Benjamin");
Use the ContainsKey() method to check whether a key exists in a Hashtable or not.
Let’s check for key 3. It returns True of the key is found.
h.ContainsKey(3));
Example
using System;
using System.Collections;
public class Demo {
public static void Main() {
Hashtable h = new Hashtable();
h.Add(1, "Sam");
h.Add(2, "Jack");
h.Add(3, "Andy");
h.Add(4, "Katie");
h.Add(5, "Beth");
h.Add(6, "Benjamin");
Console.WriteLine("Keys and Values list:");
foreach (var key in h.Keys ) {
Console.WriteLine("Key = {0}, Value = {1}",key , h[key]);
}
Console.WriteLine("Does the specified key exist? "+h.ContainsKey(3));
}
}Output
Keys and Values list: Key = 6, Value = Benjamin Key = 5, Value = Beth Key = 4, Value = Katie Key = 3, Value = Andy Key = 2, Value = Jack Key = 1, Value = Sam Does the specified key exist? True
Updated on: 23-Jun-2020
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