How to use named and optional parameters in C#

Microsoft released assistance for named and optional parameters in C# 4.. When a named parameter is applied to specify an argument based on the identify of the argument and not the situation, an optional parameter can be applied to omit 1 or extra parameters in the technique signature. The parameters of a technique can be both required or optional relying on whether or not or not you want to move a benefit to these parameters when the technique is identified as.

It need to be observed that named and optional parameters can be applied not only with approaches but also with indexers and delegates. This article discusses these two strong capabilities of the C# programming language and how we can work with them.

To work with the code illustrations offered in this article, you need to have Visible Studio 2019 set up in your process. If you do not currently have a copy, you can down load Visible Studio 2019 here.

Generate a console software task in Visible Studio

Very first off, let us generate a .Internet Core console software task in Visible Studio. Assuming Visible Studio 2019 is set up in your process, observe the ways outlined beneath to generate a new .Internet Core console software task in Visible Studio.

  1. Launch the Visible Studio IDE.
  2. Click on “Create new task.”
  3. In the “Create new project” window, pick “Console Application (.Internet Core)” from the list of templates exhibited.
  4. Click Subsequent.
  5. In the “Configure your new project” window shown following, specify the identify and site for the new task.
  6. Click Generate.

This will generate a new .Internet Core console software task in Visible Studio 2019. We’ll use this task to work with named and optional parameters in the subsequent sections of this article.

Use named parameters in C#

When you get in touch with a technique, constructor, indexer, or delegate, you need to move arguments for the required parameters but you are no cost to omit arguments for the parameters that have been outlined as optional parameters.

You might normally want to get in touch with a technique that has lots of parameters. And even when you’re contacting such a technique with only the required parameters, it is sometimes extremely difficult to comprehend which argument maps to which parameter. Here’s exactly where named arguments come to the rescue.

Named arguments in the C# programming language are applied to associate the argument identify of a technique with its benefit — i.e., the benefit passed as an argument when contacting the technique. It need to be observed that when employing a named argument, the arguments are evaluated in the identical buy in which they ended up passed.

Copyright © 2020 IDG Communications, Inc.

Rosa G. Rose

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