How to pass method as Action parameter | VB.Net
In VB.NET, you can pass an Action as a parameter to a method, allowing you to encapsulate a block of code that can be executed later. An Action is a delegate that represents a method with no parameters and no return value. This is particularly useful when you want to pass behavior or actions as data to methods or functions.
To use an Action delegate as a parameter, you must first create a method that matches the signature of the delegate. For example, the following code shows a method that matches the signature of the Action delegate:
Once you have created a method that matches the signature of the delegate, you can pass the method to another method as a parameter. For example, the following code shows how to pass the MyMethod() method to the DoSomethingWithAction() method:
The AddressOf operator is used to return a delegate that references the specified method.
Here's a detailed explanation with examples:
Defining an Action
You can define an Action that takes no parameters and performs a specific action, such as printing a message:
Using an Action as a Parameter
You can pass this Action as a parameter to a method, allowing the method to execute it. Here's an example:
In this example, the PerformAction method accepts an Action as a parameter. When called with printAction, it executes the code block defined in the printAction delegate.
You can also create anonymous Action delegates directly as method parameters:
Multiple Action Parameters
You can pass multiple Action parameters to a method, allowing you to execute different actions:
In this case, the method executes two different actions, as specified in the PerformMultipleActions method call.
You can pass an Action as a parameter to a method, allowing you to encapsulate and execute blocks of code as needed. An Action is a delegate representing a method with no parameters and no return value, making it a flexible way to pass behavior or actions as parameters to functions, enhancing code modularity and flexibility.