Welcome
Who is the course for and prerequisites
What will you learn in this course?
From Zero to Hero: Working with Null in C#
Learn how to properly use null in C# in a modern way and write better, robust code
About This Course
Null is often called the billion-dollar mistake, and for good reason. It can be very problematic. The idea of
something having a nothing value sounds dangerous in software engineering. Over the years, C# has introduced
features such as Nullable Reference Types to help developers write better, more robust, and safe code, but many
people still don't know how to use it properly. In this course, Ed Charbeneau will start with the basics and
teach you everything there is to know about null, from how to use it, from when not to use and how to take
an existing full stack application that isn't using it properly and re-engineer it to make full use of the feature.
Course Curriculum
4h 38m 8 sections
Why is null important in C#?
Why is null a problem in C#?
The C# type system and value types
Reference types in C#
Unpacking the default keyword
How C# uses types on the heap and stack
A brief history of null in C#
Nullable value types in C# 2+
Nullable reference types in C# 8+
Setting the nullable context
Understanding common null compiler warnings
Null intent is for compilers and developers too
What is the null conditional operator?
Using the null conditional operator with arrays
What is null conditional short-circuiting?
What is the null coalescing operator?
What is the null coalescing conditional operator?
What is the null forgiving operator?
API design with null intent introduction
Working with null and properties
Unpacking the "Exiting the constructor" null warning
What is the required keyword, and when to use it
Advanced API intent with the AllowNull attribute
Advanced API intent with the DisallowNull attribute
Advanced API intent with the MemberNotNull attribute
Advanced API intent with the NotNullIfNotNull attribute
Introduction to pattern matching and the is keyword
Property matching to filter null
Capturing null with the pattern matching switch operator
The BlazingPizza project overview
Enabling the nullable context and treating warnings as errors
How null affects EF migrations
How null affects EF relationships
Using the Visual Studio references feature to find null intent
How null affects full-stack objects
When to use the required keyword
Updating shared classes with proper null intent
Shared library walkthrough wrap up
Web API best practices, GET operations
Web API best practices, PUT operations
Web API best practices, POST operations
Web API best practices, DELETE operations
How to handle null with authorization and claims
Improving an API with the DisallowNull attribute
Fixing null issues with null operators
Handling RazorComponents Authorization values
How to handle Null with HttpClient
Updating the application state object
Applying null to Blazor pages
Best practices for loading without relying on null in Blazor
Unpacking the AuthenticationState component
When to use EditorRequired in a RazorComponent
Wrapping up the BlazingPizza walk through
Meet Your Instructor
Ed Charbeneau
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