C# Language Trick – Pattern Matching

🔥 This C# 9+ feature can replace multiple if statements

Instead of:

if (shape is Circle c) { /* ... */ }
else if (shape is Rectangle r) { /* ... */ }
else if (shape is Triangle t) { /* ... */ }

Do this:

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("Unknown shape")
};

Benefits:

More readable
Safer (compiler checks exhaustiveness)
Easier to maintain

What’s your favorite modern C# feature?