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OrderedDictionary Class in C#
The OrderedDictionary class represents a collection of key/value pairs that are accessible by the key or index.
Following are the properties of OrderedDictionary class −
| Sr.no | Property & Description |
|---|---|
| 1 | Count Gets the number of key/values pairs contained in the OrderedDictionary collection. |
| 2 | IsReadOnly Gets a value indicating whether the OrderedDictionary collection is read-only. |
| 3 | Item[Int32] Gets or sets the value at the specified index. |
| 4 | Item[Object] Gets or sets the value with the specified key. |
| 5 | Keys Gets an ICollection object containing the keys in the OrderedDictionary collection. |
| 6 | Values Gets an ICollection object containing the values in the OrderedDictionary collection. |
Following are some of the methods of the OrderedDictionary class −
| Sr.no | Method & Description |
|---|---|
| 1 | Add(Object, Object) Adds an entry with the specified key and value into the OrderedDictionary collection with the lowest available index. |
| 2 | AsReadOnly() Returns a read-only copy of the current OrderedDictionary collection. |
| 3 | Clear() Removes all elements from the OrderedDictionary collection. |
| 4 | Contains(Object) Determines whether the OrderedDictionary collection contains a specific key. |
| 5 | CopyTo(Array, Int32) Copies the OrderedDictionary elements to a onedimensional Array object at the specified index. |
| 6 | Equals(Object) Determines whether the specified object is equal to the current object. (Inherited from Object) |
| 7 | GetEnumerator() Returns an IDictionaryEnumerator object that iterates through the OrderedDictionary collection. |
Let us now see some examples −
Example
To get the number of key/values pairs contained in OrderedDictionary, the code is as follows −
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main() {
OrderedDictionary dict = new OrderedDictionary();
dict.Add("A", "Home Appliances");
dict.Add("B", "Electronics");
dict.Add("C", "Smart Wearables");
dict.Add("D", "Pet Supplies");
dict.Add("E", "Clothing");
dict.Add("F", "Footwear");
Console.WriteLine("OrderedDictionary elements...");
foreach(DictionaryEntry d in dict) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Count of elements in OrderedDictionary = " + dict.Count);
dict.Clear();
Console.WriteLine("Count of elements in OrderedDictionary (Updated)= " + dict.Count);
}
}Output
This will produce the following output −
OrderedDictionary elements... A Home Appliances B Electronics C Smart Wearables D Pet Supplies E Clothing F Footwear Count of elements in OrderedDictionary = 6 Count of elements in OrderedDictionary (Updated)= 0
Example
To remove all elements from OrderedDictionary, the code is as follows −
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main() {
OrderedDictionary dict = new OrderedDictionary();
dict.Add("A", "Books");
dict.Add("B", "Electronics");
dict.Add("C", "Smart Wearables");
dict.Add("D", "Pet Supplies");
dict.Add("E", "Clothing");
dict.Add("F", "Footwear");
Console.WriteLine("OrderedDictionary elements...");
foreach(DictionaryEntry d in dict) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Count of elements in OrderedDictionary = " + dict.Count);
dict.Clear();
Console.WriteLine("Count of elements in OrderedDictionary (Updated)= " + dict.Count);
}
}Output
This will produce the following output −
OrderedDictionary elements... A Books B Electronics C Smart Wearables D Pet Supplies E Clothing F Footwear Count of elements in OrderedDictionary = 6 Count of elements in OrderedDictionary (Updated)= 0
Updated on: 10-Dec-2019
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