Controlling How Parameters Are Passed

Explore how to pass parameters in C# methods using by value, ref, and out keywords. Understand differences, practical examples, and simplifications introduced in C# 7.0 for better control over variable states when building your own types.

We'll cover the following...

Passing parameters
- Try it yourself
Simplified out parameters
- Try it yourself
Understanding ref returns

When a parameter is passed into a method, it can be passed in one of three ways:

By value (the default): Think of these as in-only.
As an out parameter: Think of these as being out-only. out parameters cannot have a default value assigned in the parameter declaration and cannot be left uninitialized. They must be set inside the method, or the compiler will give an error.
By reference as a ref parameter: Think of these as being in and out. Like out parameters, ref parameters also cannot have default values, but since they can already be set outside the method, they do not need to be set inside the method. ...

1.Introduction

2.Hello, C#! Welcome, .NET!

3.Speaking C#

4.Controlling Flow, Converting Types, and Handling Exception

5.Writing, Debugging, and Testing Functions

6.Building Your Own Types with Object-Oriented Programming

7.Implementing Interfaces and Inheriting Classes

8.Packaging and Distributing .NET Types

9.Working with Common .NET Types

10.Working with Files, Streams, and Serialization

11.Working with Data Using Entity Framework Core

12.Querying and Manipulating Data Using LINQ

13.Introducing Web Development Using ASP.NET Core

14.Building Websites Using ASP.NET Core Razor Pages

15.Building Websites Using the Model-View-Controller Pattern

16.Building and Consuming Web Services

17.Building User Interfaces Using Blazor

18.Conclusion

Controlling How Parameters Are Passed