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For more information, see Thread-Safe Collections and. The classes in the namespace should be used instead of the corresponding types in the and System.Collections namespaces whenever multiple threads are accessing the collection concurrently.
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NET Framework 4 or newer, the collections in the namespace provide efficient thread-safe operations for accessing collection items from multiple threads. Represents a last in, first out (LIFO) collection of objects.įor additional information, see Commonly Used Collection Types, Selecting a Collection Class, and. Represents a collection of key/value pairs that are sorted by key based on the associated IComparer implementation. Represents a first in, first out (FIFO) collection of objects. Provides methods to search, sort, and modify lists. Represents a list of objects that can be accessed by index. Represents a collection of key/value pairs that are organized based on the key. The following table lists some of the frequently used classes of the namespace: Class A generic collection enforces strong typing by allowing only the desired data type to be added. A generic collection is useful when every item in the collection has the same data type. You can create a generic collection by using one of the classes in the namespace. Some of the common collection classes are described in this section: Each type of collection is designed for a specific purpose. Many common collections are provided by the. Public Property MegaLightYears As Integer New Galaxy With Ĭonsole.WriteLine(.Name & " " &. Private Sub IterateThroughList()ĭim theGalaxies As New List(Of Galaxy) From In the following example, the Galaxy class that is used by the List is defined in the code. ' A lambda expression is placed in the ForEach methodįor the type of elements in the List, you can also define your own class. Dim numbers As New List(Of Integer) Fromįor index As Integer = numbers.Count - 1 To 0 Step -1 This is because the RemoveAt method causes elements after a removed element to have a lower index value. Instead of a For Each statement, a For…Next statement that iterates in descending order is used. The following example removes elements from a generic list. ' Remove an element in the list by specifying The following example removes an element from the collection by specifying the object to remove. The following example iterates through the elements of a collection by using For…Next instead of For Each. The index of the elements starts at 0 and ends at the element count minus 1. You accomplish this by accessing the collection elements by the index position. You can use a For…Next statement instead of a For Each statement to iterate through a collection. The following example is the same as the previous example, except a collection initializer is used to add elements to the collection. For more information, see Collection Initializers. If the contents of a collection are known in advance, you can use a collection initializer to initialize the collection. The following example creates a list of strings and then iterates through the strings by using a For Each…Next statement. The examples in this section use the generic List class, which enables you to work with a strongly typed list of objects. When you retrieve an element from a generic collection, you do not have to determine its data type or convert it.įor the examples in this topic, include Imports statements for the and System.Linq namespaces. A generic collection enforces type safety so that no other data type can be added to it. If your collection contains elements of only one data type, you can use one of the classes in the namespace. For some collections, you can assign a key to any object that you put into the collection so that you can quickly retrieve the object by using the key.Ī collection is a class, so you must declare an instance of the class before you can add elements to that collection. Unlike arrays, the group of objects you work with can grow and shrink dynamically as the needs of the application change. For information about arrays, see Arrays.Ĭollections provide a more flexible way to work with groups of objects. There are two ways to group objects: by creating arrays of objects, and by creating collections of objects.Īrrays are most useful for creating and working with a fixed number of strongly typed objects. For many applications, you want to create and manage groups of related objects.