How to Stop NullReferenceExceptions in .NET
This article gives you a toolset for stopping NullReferenceExceptions in .NET code. The article centers around Nullable Reference Types (NRT), a feature that Microsoft added in C# 8. This article mentions five additional tools to ensure that users will never encounter the exception and explains how to implement them in your code. The Toolset Use non-nullable variables (Reference and value types): flag variables that should never be null Null object pattern: inject default implementations with null behavior instead of null references Treat NRT warnings as errors: enforce the NRT rules to ensure that variables cannot enter a null/not-null state at the wrong time. Treat NRT warnings as errors so code will not compile if it breaks the NRT rules. Immutability: reduce the risk of NullReferenceException by only setting the reference once ArgumentNullException: An oldy but a goody. Stop code execution...
Christian Findlay
Jul 30, 2021
