The SortedList class in C# represents a collection of key/value pairs that are sorted by the keys and are accessible by key and by index.
Following are the properties of the SortedList class −
| Sr.No | Property & Description |
|---|---|
| 1 | Capacity Gets or sets the capacity of a SortedList object. |
| 2 | Count Gets the number of elements contained in a SortedList object. |
| 3 | IsFixedSize Gets a value indicating whether a SortedList object has a fixed size. |
| 4 | IsReadOnly Gets a value indicating whether a SortedList object is readonly. |
| 5 | IsSynchronized Gets a value indicating whether access to a SortedList object is synchronized (thread safe). |
| 6 | Item[Object] Gets or sets the value associated with a specific key in a SortedList object. |
| 7 | Keys Gets the keys in a SortedList object. |
| 8 | SyncRoot Gets an object that can be used to synchronize access to a SortedList object. |
| 9 | Values Gets the values in a SortedList object. |
Following are some of the methods of the Sorted class −
| Sr.No | Methods & Description |
|---|---|
| 1 | Add(Object, Object) Adds an element with the specified key and value to a SortedList object. |
| 2 | Clear() Removes all elements from a SortedList object. |
| 3 | Clone() Creates a shallow copy of a SortedList object. |
| 4 | Contains(Object) Determines whether a SortedList object contains a specific key. |
| 5 | ContainsKey(Object) Determines whether a SortedList object contains a specific key. |
| 6 | ContainsValue(Object) Determines whether a SortedList object contains a specific value. |
| 7 | CopyTo(Array, Int32) Copies SortedList elements to a onedimensional Array object, starting at the specified index in the array. |
| 8 | SyncRoot Gets an object that can be used to synchronize access to a SortedList object. |
| 9 | Values Gets the values in a SortedList object. |
Let us now see some examples −
To get the number of elements contained in the SortedList, the code is as follows −
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);
}
}Output
This will produce the following output −
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
To check if two SortedList objects are equal, the code is as follows −
Example
using System;
using System.Collections;
public class Demo {
public static void Main(String[] args) {
SortedList list1 = new SortedList();
list1.Add("One", 1);
list1.Add("Two ", 2);
list1.Add("Three ", 3);
list1.Add("Four", 4);
list1.Add("Five", 5);
list1.Add("Six", 6);
list1.Add("Seven ", 7);
list1.Add("Eight ", 8);
list1.Add("Nine", 9);
list1.Add("Ten", 10);
Console.WriteLine("SortedList1 elements...");
foreach(DictionaryEntry d in list1) {
Console.WriteLine(d.Key + " " + d.Value);
}
SortedList list2 = new SortedList();
list2.Add("A", "Accessories");
list2.Add("B", "Books");
list2.Add("C", "Smart Wearable Tech");
list2.Add("D", "Home Appliances");
Console.WriteLine("\nSortedList2 elements...");
foreach(DictionaryEntry d in list2) {
Console.WriteLine(d.Key + " " + d.Value);
}
SortedList list3 = new SortedList();
list3 = list2;
Console.WriteLine("\nIs SortedList2 equal to SortedList3? = "+list3.Equals(list2));
}
}Output
This will produce the following output −
SortedList1 elements... Eight 8 Five 5 Four 4 Nine 9 One 1 Seven 7 Six 6 Ten 10 Three 3 Two 2 SortedList2 elements... A Accessories B Books C Smart Wearable Tech D Home Appliances Is SortedList2 equal to SortedList3? = True