Oli Sturm
46 lines
1.4 KiB
C#
46 lines
1.4 KiB
C#
namespace CS8 {
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class Program {
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// This is a "switch expression"
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static int CalcResult(int input) => input switch
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{
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1 => 2,
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2 => 3,
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_ => throw new ArgumentException("Rien ne va plus")
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};
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// Property Pattern:
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bool IsJune(DateTime dt) => dt is { Month: 6 };
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public class Address {
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public string? City { get; set; }
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public string? Country { get; set; }
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}
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public class Customer {
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// ...
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public Address? Address { get; set; }
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}
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static void Main(string[] args) {
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// This is a tuple, supported since C# 7
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(string, string) personInfo = ("Oli", "Sturm");
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var (firstName, lastName) = personInfo;
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// firstName ist jetzt "Oli" und lastName ist "Sturm"
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// Positional pattern (using a tuple - hence "tuple pattern" in this special case)
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// Important: this works with any deconstructable type! Example coming up in CS9 sample.
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if (personInfo is ("Oli", var olisLastName))
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Console.WriteLine($"Found Oli, his last name is {olisLastName}.");
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// Nested property patterns:
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var customer = new Customer
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{
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Address = new Address { City = "Castle Douglas", Country = "UK" }
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};
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if (customer is { Address: { City: "Castle Douglas" } }) {
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Console.WriteLine("This customer lives around the corner");
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}
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}
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}
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}
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