Patterns.cs

using System;
interface IBase {}
interface IFoo : IBase
{
	int A {get;}
}
class Foo : IFoo
{
public int A {get;set;}
}

interface IBoo : IBase
{
int B {get;}
}

public class TestPatternMatching {
    public void Sample() {
        string Match1(int o)
        {
            switch(o)
            {
                case int n when n > 100: return "> 100";
                case int n when n > 50: return "> 50";
                case int n when n > 10: return "> 10";
                default: return "";
            }
        }
        var result1 = Match1(70);

        int Match2(IBase o)
        {
            switch(o)
            {
                case IFoo f: return f.A;
                case IBoo b: return b.B;
                default: throw new Exception("Foo is not of type IFoo nor IBoo, buhuhu:(");
            }
        }
        int result2 = Match2(new Foo(){A=5});

        string Match3(object o)
        {
            switch(o)
            {
                case 5: return o.ToString();
                case "10": return "10";
                case Foo _: return "foo";
                default: throw new Exception();
            }
        }
        string result3 = Match3(5);

    }
}