HybridDictionary Class in C#?

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The HybridDictionary class implements IDictionary by using a ListDictionary while the collection is small, and then switching to a Hashtable when the collection gets large.

Following are the properties of the HybridDictionary class −

Sr.NoProperty & Description
1Count
Gets the number of key/value pairs contained in the HybridDictionary.
2IsFixedSize
Gets a value indicating whether the HybridDictionary has a fixed size.
3IsReadOnly
Gets a value indicating whether the HybridDictionary is read-only.
4IsSynchronized
Gets a value indicating whether the HybridDictionary is synchronized (thread safe).
5Item[Object]
Gets or sets the value associated with the specified key.
6Keys
Gets an ICollection containing the keys in the HybridDictionary.
7SyncRoot
Gets an object that can be used to synchronize access to the HybridDictionary.
8Values
Gets an ICollection containing the values in the HybridDictionary.

Following are some of the methods of the HybridDictionary class −

Sr.NoMethods & Description
1Add(Object, Object)
Adds an entry with the specified key and value into the HybridDictionary.
2Clear()
Removes all entries from the HybridDictionary.
3Contains(Object)
Determines whether the HybridDictionary contains a specific key.p>
4CopyTo(Array, Int32)
Copies the HybridDictionary entries to a onedimensional Array instance at the specified index.
5Equals(Object)
Determines whether the specified object is equal to the current object. (Inherited from Object)
6GetEnumerator()
Returns an IDictionaryEnumerator that iterates through the HybridDictionary.
7GetHashCode()
Serves as the default hash function. (Inherited from Object)
8GetType()
Gets the Type of the current instance. (Inherited from Object)

To count the number of key/value pairs in HybridDictionary, the code is as follows −

Example

Let us now see some examples −

 Live Demo

using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
   public static void Main() {
      HybridDictionary dict1 = new HybridDictionary();
      dict1.Add("A", "SUV");
      dict1.Add("B", "MUV");
      dict1.Add("C", "AUV");
      Console.WriteLine("HybridDictionary1 elements...");
      foreach(DictionaryEntry d in dict1) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("Count of Key/value pairs in Dictionary1 = "+dict1.Count);
      HybridDictionary dict2 = new HybridDictionary();
      dict2.Add("1", "One");
      dict2.Add("2", "Two");
      dict2.Add("3", "Three");
      dict2.Add("4", "Four");
      dict2.Add("5", "Five");
      dict2.Add("6", "Six");
      Console.WriteLine("\nHybridDictionary2 elements...");
      foreach(DictionaryEntry d in dict2) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("Count of Key/value pairs in Dictionary2 = "+dict1.Count);
      dict2.Clear();
      Console.WriteLine("Count of Key/value pairs in Dictionary2 (Updated) = "+dict2.Count);
   }
}

Output

This will produce the following output −

HybridDictionary1 elements...
A SUV
B MUV
C AUV
Count of Key/value pairs in Dictionary1 = 3
HybridDictionary2 elements...
1 One
2 Two
3 Three
4 Four
5 Five
6 Six
Count of Key/value pairs in Dictionary2 = 3
Count of Key/value pairs in Dictionary2 (Updated) = 0

To check if HybridDictionary is synchronized, the code is as follows −

Example

 Live Demo

using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
   public static void Main() {
      HybridDictionary dict1 = new HybridDictionary();
      dict1.Add("A", "Books");
      dict1.Add("B", "Electronics");
      dict1.Add("C", "Smart Wearables");
      dict1.Add("D", "Pet Supplies");
      dict1.Add("E", "Clothing");
      dict1.Add("F", "Footwear");
      Console.WriteLine("HybridDictionary1 elements...");
      foreach(DictionaryEntry d in dict1) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("Is the HybridDictionary1 having fixed size? = "+dict1.IsFixedSize);
      Console.WriteLine("If HybridDictionary1 read-only? = "+dict1.IsReadOnly);
      Console.WriteLine("Is HybridDictionary1 synchronized = "+dict1.IsSynchronized);
      HybridDictionary dict2 = new HybridDictionary();
      dict2.Add("1", "One");
      dict2.Add("2", "Two");
      dict2.Add("3", "Three");
      dict2.Add("4", "Four");
      dict2.Add("5", "Five");
      dict2.Add("6", "Six");
      Console.WriteLine("\nHybridDictionary2 elements...");
      foreach(DictionaryEntry d in dict2) {
         Console.WriteLine(d.Key + " " + d.Value);
      }
      Console.WriteLine("Is HybridDictionary1 equal to HybridDictionary2? = "+(dict1.Equals(dict2)));
      Console.WriteLine("Is the HybridDictionary2 having fixed size? = "+dict2.IsFixedSize);
      Console.WriteLine("If HybridDictionary2 read-only? = "+dict2.IsReadOnly);
      Console.WriteLine("Is HybridDictionary2 synchronized = "+dict2.IsSynchronized);
   }
}

Output

This will produce the following output −

HybridDictionary1 elements...
A Books
B Electronics
C Smart Wearables
D Pet Supplies
E Clothing
F Footwear
Is the HybridDictionary1 having fixed size? = False
If HybridDictionary1 read-only? = False
Is HybridDictionary1 synchronized = False
HybridDictionary2 elements...
1 One
2 Two
3 Three
4 Four
5 Five
6 Six
Is HybridDictionary1 equal to HybridDictionary2? = False
Is the HybridDictionary2 having fixed size? = False
If HybridDictionary2 read-only? = False
Is HybridDictionary2 synchronized = False
raja
Published on 16-Dec-2019 06:39:28
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