AddressOf OperatorUse the AddressOf operator to specify a Function as a delegate argument.
This page was last reviewed on Mar 20, 2022.
AddressOf. This VB.NET operator enables delegate functions. With it we reference a method and use it as the implementation for a delegate.
Operator syntax. We use the name of a function and specify it where a delegate is required. We can use AddressOf to reference a function instead of a lambda.
Example. This program introduces the IsThreeLetters Function, which receives a String and returns a Boolean. This Function is used as a delegate. In Main we create a List and add 3 values to it.
Then The List.Find Function is used to find the first 3-letter String in the List instance.
List Find, Exists
AddressOf The AddressOf operator is used and it references the IsThreeLetters Function. We display the result.
Module Module1 Function IsThreeLetters(ByVal value As String) As Boolean Return value.Length = 3 End Function Sub Main() Dim list As List(Of String) = New List(Of String) list.Add("mouse") list.Add("horse") list.Add("dog") Dim value As String = list.Find(AddressOf IsThreeLetters) Console.WriteLine(value) End Sub End Module
Discussion. In the C# language, you do not need AddressOf. Instead, you can use the method name directly as the delegate. The AddressOf operator may be less confusing.
Info AddressOf introduces the context in which the method name should be referenced. The method name is just used to acquire a memory address.
Summary. The AddressOf operator references an existing Function and turns it into a delegate. We do not need to use lambda expression syntax. We can use existing functions.
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This page was last updated on Mar 20, 2022 (rewrite).
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