Get the number of elements contained in SortedList in C#

The Count property in C# is used to get the number of elements contained in a SortedList. This property returns an integer representing the total count of key-value pairs stored in the collection.

Syntax

Following is the syntax for using the Count property −

int count = sortedList.Count;

Parameters

The Count property does not take any parameters. It is a read-only property that returns the current number of elements.

Return Value

The Count property returns an int value representing the number of key-value pairs in the SortedList.

Using Count Property with SortedList

Example

using System;
using System.Collections;

public class Demo {
   public static void Main(String[] args) {
      SortedList sortedList = new SortedList();
      sortedList.Add("A", "1");
      sortedList.Add("B", "2");
      sortedList.Add("C", "3");
      sortedList.Add("D", "4");
      sortedList.Add("E", "5");
      sortedList.Add("F", "6");
      sortedList.Add("G", "7");
      sortedList.Add("H", "8");
      sortedList.Add("I", "9");
      sortedList.Add("J", "10");
      
      Console.WriteLine("SortedList elements...");
      foreach(DictionaryEntry d in sortedList) {
         Console.WriteLine("Key = " + d.Key + ", Value = " + d.Value);
      }
      
      Console.WriteLine("Count of SortedList key-value pairs = " + sortedList.Count);
      sortedList.Clear();
      Console.WriteLine("Count of SortedList (updated) = " + sortedList.Count);
   }
}

The output of the above code is −

SortedList elements...
Key = A, Value = 1
Key = B, Value = 2
Key = C, Value = 3
Key = D, Value = 4
Key = E, Value = 5
Key = F, Value = 6
Key = G, Value = 7
Key = H, Value = 8
Key = I, Value = 9
Key = J, Value = 10
Count of SortedList key-value pairs = 10
Count of SortedList (updated) = 0

Using Count with Enumerator

Example

using System;
using System.Collections;

public class Demo {
   public static void Main(String[] args) {
      SortedList sortedList = new SortedList();
      sortedList.Add("One", "1");
      sortedList.Add("Two", "2");
      sortedList.Add("Three", "3");
      sortedList.Add("Four", "4");
      sortedList.Add("Five", "5");
      sortedList.Add("Six", "6");
      sortedList.Add("Seven", "7");
      sortedList.Add("Eight", "8");
      sortedList.Add("Nine", "9");
      sortedList.Add("Ten", "10");
      
      Console.WriteLine("Count of SortedList key-value pairs = " + sortedList.Count);
      Console.WriteLine("Enumerator to iterate through the SortedList...");
      
      IDictionaryEnumerator demoEnum = sortedList.GetEnumerator();
      while (demoEnum.MoveNext())
         Console.WriteLine("Key = " + demoEnum.Key + ", Value = " + demoEnum.Value);
   }
}

The output of the above code is −

Count of SortedList key-value pairs = 10
Enumerator to iterate through the SortedList...
Key = Eight, Value = 8
Key = Five, Value = 5
Key = Four, Value = 4
Key = Nine, Value = 9
Key = One, Value = 1
Key = Seven, Value = 7
Key = Six, Value = 6
Key = Ten, Value = 10
Key = Three, Value = 3
Key = Two, Value = 2

Common Use Cases

• Checking if SortedList is empty: Use Count == 0 to verify if the collection has no elements.

• Loop validation: Use Count to determine iteration limits or validate operations before processing.

• Memory management: Monitor collection size for performance optimization or capacity planning.

• Conditional operations: Execute code blocks based on the number of elements in the collection.

Conclusion

The Count property provides an efficient way to determine the number of elements in a SortedList. It returns an integer value representing the total key-value pairs and is useful for validation, iteration control, and conditional operations in your applications.