C# 9 Guideline Proposals

[Keboo]

• CONSIDER using records over classes
  Unless:
  • Inheritance chains with classes are required
  • The identity of the object is not based of the value of all its fields
  • The type is in a public API that may be consumed by older versions of C#
• AVOID positional records when validation of positional members is required
• CONSIDER using init properties instead of readonly properties for optional values
• DO define a constructor to allow setting init properties for backwards compatibility with pre-C# 9
• DO name record positional parameter with PascalCase

[Keboo]

As per discussion the following should be added to the guidelines (in the XML file)

Coding/Classes

• CONSIDER using records over classes. However, init properties are cumbersome to consume in older versions of C#, records are incompatible with class inheritance chains.
• AVOID positional records when validation of positional members is required.
• DO name record positional parameter with PascalCase

Coding/Properties

• CONSIDER using init properties instead of readonly properties for optional values. However, init properties are cumbersome to consume in older versions of C#.