C# - SortedList Class - Adglob Infosystem Pvt Ltd

The C# SortedList Class represents a collection of key-and-value pairs that are sorted by the keys and are accessible by key and by index.

A sorted list is a combination of an array and a hash table. It contains a list of items that can be accessed using a key or an index. If you access items using an index, it is an ArrayList, and if you access items using a key, it is a Hashtable. The collection of items is always sorted by the key value.

Methods and Properties of the C# SortedList Class

The following table lists some of the commonly used properties of the SortedList class −

Sr.No.	Property & Description
1	CapacityGets or sets the capacity of the SortedList.
2	CountGets the number of elements contained in the SortedList.
3	IsFixedSizeGets a value indicating whether the SortedList has a fixed size.
4	IsReadOnlyGets a value indicating whether the SortedList is read-only.
5	ItemGets and sets the value associated with a specific key in the SortedList.
6	KeysGets the keys in the SortedList.
7	ValuesGets the values in the SortedList.

The following table lists some of the commonly used methods of the SortedList class −

Sr.No.	Method & Description
1	public virtual void Add(object key, object value); Adds an element with the specified key and value into the SortedList.
2	public virtual void Clear(); Removes all elements from the SortedList.
3	public virtual bool ContainsKey(object key); Determines whether the SortedList contains a specific key.
4	public virtual bool ContainsValue(object value); Determines whether the SortedList contains a specific value.
5	public virtual object GetByIndex(int index); Gets the value at the specified index of the SortedList.
6	public virtual object GetKey(int index); Gets the key at the specified index of the SortedList.
7	public virtual IList GetKeyList(); Gets the keys in the SortedList.
8	public virtual IList GetValueList();Gets the values in the SortedList.
9	public virtual int IndexOfKey(object key); Returns the zero-based index of the specified key in the SortedList.
10	public virtual int IndexOfValue(object value); Returns the zero-based index of the first occurrence of the specified value in the SortedList.
11	public virtual void Remove(object key); Removes the element with the specified key from the SortedList.
12	public virtual void RemoveAt(int index); Removes the element at the specified index of SortedList.
13	public virtual void TrimToSize(); Sets the capacity to the actual number of elements in the SortedList.

Example

The following example demonstrates the concept −

using System;
using System.Collections;

namespace CollectionsApplication {
   class Program {
      static void Main(string[] args) {
         SortedList sl = new SortedList();
         
         sl.Add("001", "Zara Ali");
         sl.Add("002", "Abida Rehman");
         sl.Add("003", "Joe Holzner");
         sl.Add("004", "Mausam Benazir Nur");
         sl.Add("005", "M. Amlan");
         sl.Add("006", "M. Arif");
         sl.Add("007", "Ritesh Saikia");
         
         if (sl.ContainsValue("Nuha Ali")) {
            Console.WriteLine("This student name is already in the list");
         } else {
            sl.Add("008", "Nuha Ali");
         }

         // get a collection of the keys. 
         ICollection key = sl.Keys;

         foreach (string k in key) {
            Console.WriteLine(k + ": " + sl[k]);
         }
      }
   }
}

When the above code is compiled and executed, it produces the following result −

001: Zara Ali
002: Abida Rehman
003: Joe Holzner
004: Mausam Banazir Nur
005: M. Amlan 
006: M. Arif
007: Ritesh Saikia
008: Nuha Ali

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