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C# Program to find a key in a Hashtable
Set Hashtable collection with elements.
Hashtable h = new Hashtable(); h.Add(1, "Jack"); h.Add(2, "Henry"); h.Add(3, "Ben"); h.Add(4, "Chris");
Let’s say now you need to find any key, then use the Contains() method. We are finding key 3 here −
h.Contains(3);
The following is the complete example.
Example
using System; using System.Collections; public class Demo { public static void Main() { Hashtable h = new Hashtable(); h.Add(1, "Jack"); h.Add(2, "Henry"); h.Add(3, "Ben"); h.Add(4, "Chris"); Console.WriteLine("Keys and Values list:"); foreach (var key in h.Keys ) { Console.WriteLine("Key = {0}, Value = {1}",key , h[key]); } Console.WriteLine("Key 3 exists? "+h.Contains(3)); } }
Output
Keys and Values list: Key = 4, Value = Chris Key = 3, Value = Ben Key = 2, Value = Henry Key = 1, Value = Jack Key 3 exists? True
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