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Count the number of key/value pairs in the Hashtable in C#
To count the number of key/value pairs in the Hashtable, the code is as follows −
Example
using System; using System.Collections; public class Demo { public static void Main() { Hashtable hash = new Hashtable(); hash.Add("A", "SUV"); hash.Add("B", "MUV"); hash.Add("C", "AUV"); Console.WriteLine("Hashtable elements..."); foreach(DictionaryEntry d in hash) { Console.WriteLine(d.Key + " " + d.Value); } Console.WriteLine("Count of Key/value pairs = "+hash.Count); hash.Add("D", "Utility Vehicle"); hash.Add("E", "Convertible"); Console.WriteLine("Count of Key/value pairs (Updated) = "+hash.Count); } }
Output
This will produce the following output −
Hashtable elements... C AUV A SUV B MUV Count of Key/value pairs = 3 Count of Key/value pairs (Updated) = 5
Example
Let us see another example −
using System; using System.Collections; public class Demo { public static void Main() { Hashtable hash = new Hashtable(10); hash.Add("1", "A"); hash.Add("2", "B"); hash.Add("3", "C"); hash.Add("4", "D"); hash.Add("5","E"); hash.Add("6", "F"); hash.Add("7", "G"); hash.Add("8","H"); hash.Add("9", "I"); hash.Add("10", "J"); Console.WriteLine("Hashtable Key and Value pairs..."); foreach(DictionaryEntry entry in hash) { Console.WriteLine("{0} and {1} ", entry.Key, entry.Value); } Console.WriteLine("Is the Hashtable having fixed size? = "+hash.IsFixedSize); Console.WriteLine("Count of key/value pairs in Hashtable = "+ hash.Count); Console.WriteLine("\nEnumerator to iterate through the Hashtable..."); IDictionaryEnumerator demoEnum = hash.GetEnumerator(); while (demoEnum.MoveNext()) Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value); } }
Output
This will produce the following output −
Hashtable Key and Value pairs... 10 and J 1 and A 2 and B 3 and C 4 and D 5 and E 6 and F 7 and G 8 and H 9 and I Is the Hashtable having fixed size? = False Count of key/value pairs in Hashtable = 10 Enumerator to iterate through the Hashtable... Key = 10, Value = J Key = 1, Value = A Key = 2, Value = B Key = 3, Value = C Key = 4, Value = D Key = 5, Value = E Key = 6, Value = F Key = 7, Value = G Key = 8, Value = H Key = 9, Value = I
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