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. Examples of reasonable accommodation include making a change to the application process or work procedures, providing documents in an alternate format, using a sign language interpreter, or using specialized equipment.For many applications, you want to create and manage groups of related objects. Please tell us if you require a reasonable accommodation to apply for a job or to perform your job. Federal law requires employers to provide reasonable accommodation to qualified individuals with disabilities. All qualified individuals are encouraged to apply and will receive consideration without regard to race, color, gender, gender identity or expression, sexual orientation, national origin, age, religion, creed, disability, veteran status, or any other factor that cannot lawfully be used as a basis for an employment decision. MSK is an equal opportunity and affirmative action employer committed to diversity and inclusion in all aspects of recruiting and employment. If a disability prevents you from applying for a job through this website, click here.
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