C# Language Pattern Matching Tip: replace multiple if statements with the C# 9 and later switch expression
Instead of using multiple checks with is and else if like
if (shape is Circle c) { /* ... */ } else if (shape is Rectangle r) { /* ... */ } else if (shape is Triangle t) { /* ... */ }
use the switch expression with pattern matching for greater clarity and safety
var area = shape switch { Circle c => Math.PI * c.Radius * c.Radius, Rectangle r => r.Width * r.Height, Triangle t => t.Base * t.Height / 2, _ => throw new ArgumentException() };
Benefits: more readable, the compiler can verify exhaustiveness, easier to maintain
More details: the C# 8 and C# 9 syntax has improved pattern matching by allowing switch expressions, property matching, and relational patterns, which reduces errors and makes the code more declarative
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