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Pattern matching has evolved C# from a purely Imperative language into a powerful Functional hybrid. It allows you to 'Deconstruct' and 'Branch' your logic with extreme precision.
Forget giant `switch` blocks. Expressions are cleaner and return a value:
string message = result switch {
Success { Data: var d } => "Got " + d,
Error { Code: 404 } => "Not Found",
_ => "Unknown"
};
You can match values based on ranges and logic directly:
if (temp is > 0 and <= 30) { ... }
if (user is not null and { IsAdmin: true }) { ... }
This makes validation logic incredibly readable and hard to mess up.
Q: "What is 'Recursive Pattern Matching'?"
Architect Answer: "Recursive matching is when you match on the *properties* of an object inside a pattern. For example, `person is { Address: { City: "NY" } }`. This 'Deep Dive' allows you to validate complex object graphs in a single `if` or `switch` statement without writing multiple nested null checks. It is the gold standard for clean, defensive programming in .NET."
Quizzes linked to this course—pass to earn certificates.
On this page
1. Switch Expressions 2. Relational & Logical Patterns 4. Interview Mastery