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ListDictionary Class in C#
The ListDictionary class implements IDictionary using a singly linked list. It is recommended for collections that typically include fewer than 10 items.
Following are the properties of ListDictionary class −
| Sr.No | Property & Description |
|---|---|
| 1 | Count Gets the number of key/value pairs contained in the ListDictionary. |
| 2 | IsFixedSize Gets a value indicating whether the ListDictionary has a fixed size. |
| 3 | IsReadOnly Gets a value indicating whether the ListDictionary is readonly. |
| 4 | IsSynchronized Gets a value indicating whether the ListDictionary is synchronized (thread safe). |
| 5 | Item[Object] Gets or sets the value associated with the specified. |
| 6 | Keys Gets an ICollection containing the keys in the ListDictionary. |
| 7 | SyncRoot Gets an object that can be used to synchronize access to the ListDictionary. |
| 8 | Values Gets an ICollection containing the values in the ListDictionary. |
Following are some of the methods of the ListDictionary class −
| Sr.No | Methods & Description |
|---|---|
| 1 | Add(Object, Object) Adds an entry with the specified key and value into the ListDictionary. |
| 2 | Clear() Removes all entries from the ListDictionary. |
| 3 | Contains(Object) Determines whether the ListDictionary contains a specific key. |
| 4 | CopyTo(Array, Int32) Copies the ListDictionary entries to a onedimensional Array instance at the specified index. |
| 5 | Equals(Object) Determines whether the specified object is equal to the current object. (Inherited from Object) |
| 6 | GetEnumerator() Returns an IDictionaryEnumerator that iterates through the ListDictionary. |
| 7 | GetHashCode() Serves as the default hash function. (Inherited from Object) |
| 8 | GetType() Gets the Type of the current instance. (Inherited from Object) |
Example
Let us now see some examples −
To check if ListDictionary is read-only, the code is as follows −
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main() {
ListDictionary dict1 = new ListDictionary();
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("ListDictionary1 elements...");
foreach(DictionaryEntry d in dict1) {
Console.WriteLine(d.Key + " " + d.Value);
}
Console.WriteLine("Is the ListDictionary1 having fixed size? = "+dict1.IsFixedSize);
Console.WriteLine("If ListDictionary1 read-only? = "+dict1.IsReadOnly);
Console.WriteLine("Is ListDictionary1 synchronized = "+dict1.IsSynchronized);
Console.WriteLine("The ListDictionary1 has the key M? = "+dict1.Contains("M"));
ListDictionary dict2 = new ListDictionary();
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("
ListDictionary2 key-value pairs...");
IDictionaryEnumerator demoEnum = dict2.GetEnumerator();
while (demoEnum.MoveNext())
Console.WriteLine("Key = " + demoEnum.Key + ", Value = "+ demoEnum.Value);
Console.WriteLine("Is the ListDictionary2 having fixed size? = "+dict2.IsFixedSize);
Console.WriteLine("If ListDictionary2 read-only? = "+dict2.IsReadOnly);
Console.WriteLine("Is ListDictionary2 synchronized = "+dict2.IsSynchronized);
Console.WriteLine("The ListDictionary2 has the key 5? = "+dict2.Contains("5"));
}
}Output
This will produce the following output −
ListDictionary1 elements... A Books B Electronics C Smart Wearables D Pet Supplies E Clothing F Footwear Is the ListDictionary1 having fixed size? = False If ListDictionary1 read-only? = False Is ListDictionary1 synchronized = False The ListDictionary1 has the key M? = False ListDictionary2 key-value pairs... Key = 1, Value = One Key = 2, Value = Two Key = 3, Value = Three Key = 4, Value = Four Key = 5, Value = Five Key = 6, Value = Six Is the ListDictionary2 having fixed size? = False If ListDictionary2 read-only? = False Is ListDictionary2 synchronized = False The ListDictionary2 has the key 5? = True
To check if two ListDictionary objects are equal, the code is as follows −
Example
using System;
using System.Collections;
using System.Collections.Specialized;
public class Demo {
public static void Main() {
ListDictionary dict1 = new ListDictionary();
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("ListDictionary1 elements...");
foreach(DictionaryEntry d in dict1) {
Console.WriteLine(d.Key + " " + d.Value);
}
ListDictionary dict2 = new ListDictionary();
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("
ListDictionary2 elements...");
foreach(DictionaryEntry d in dict2) {
Console.WriteLine(d.Key + " " + d.Value);
}
ListDictionary dict3 = new ListDictionary();
dict3 = dict2;
Console.WriteLine("
Is ListDictionary3 equal to ListDictionary2? = "+(dict3.Equals(dict2)));
}
}Output
This will produce the following output −
ListDictionary1 elements... A Books B Electronics C Smart Wearables D Pet Supplies E Clothing F Footwear ListDictionary2 elements... 1 One 2 Two 3 Three 4 Four 5 Five 6 Six Is ListDictionary3 equal to ListDictionary2? = True
Updated on: 16-Dec-2019
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