Dictionary in vb.net
In VB.NET, the Dictionary(Of TKey, TValue) class is a collection that stores key-value pairs, where each key is unique. It provides an efficient way to store and retrieve data based on a specific key. The Dictionary class is part of the System.Collections.Generic namespace.
Important functions in VB.Net List
Creating a Dictionary
To create a dictionary, you need to specify the data types of the key (TKey) and the value (TValue).
In this example, we create a dictionary that uses String as the key type and Integer as the value type.
Adding Key-Value Pairs
You can add key-value pairs to the dictionary using the Add method.
In this example, we add three key-value pairs to the dictionary.
Accessing Values by Key
You can retrieve the value associated with a specific key using the indexer (Item) property.
In this example, we retrieve the value associated with the key "Banana".
You can modify the value associated with a specific key by assigning a new value to it using the indexer property.
In this example, we change the value associated with the key "Apple" to 15.
Removing Key-Value Pairs
You can remove a key-value pair from the dictionary using the Remove method.
In this example, we remove the key-value pair with the key "Orange" from the dictionary.
Checking if a Key Exists
You can check if a specific key exists in the dictionary using the ContainsKey method. It returns a Boolean value indicating the presence of the key.
In this example, we check if the key "Apple" exists in the dictionary.
Iterating through the Dictionary
You can iterate through the key-value pairs in the dictionary using a For Each loop.
In this example, we iterate through each key-value pair in the dictionary and access the key and value.
The provided VB.NET source code showcases a selection of frequently utilized functions.Full Source VB.NET
The Dictionary class provides an efficient way to store, retrieve, and manipulate key-value pairs in VB.NET. It is commonly used when you need fast lookup and retrieval of data based on unique keys.