christiannagel

@page "/books"
@using BooksLib
@inject HttpClient Http

<h1>Books Sample</h1>

<p>This component demonstrates fetching data from Azure Functions.</p>

<p>Status: @message</p>

christiannagel

public static class BooksFunction
{
  [FunctionName("BooksFunction")]
  public static IActionResult Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequest req, TraceWriter log)
  {
    log.Info("C# HTTP trigger function processed a request.");

    return new OkObjectResult(GetBooks());
  }

christiannagel

public class Book
{
  public Book() {  }
  
  public Book(int bookId, string title, string publisher)
    => (BookId, Title, Publisher) = (bookId, title, publisher);

  public int BookId { get; set; }
  public string Title { get; set; }
  public string Publisher { get; set; }

christiannagel

static string M3(Shape shape)
  => shape switch
  {
    CombinedShape (var shape1, var (pos, _)) => $"combined shape - shape1: {shape1.Name}, pos of shape2: {pos}",
    { Size: (200, 200), Position: var pos } => $"shape with size 200x200 at position {pos.x}:{pos.y}",
    Ellipse (var pos, var size) => $"Ellipse with size {size} at position {pos}",
    Rectangle (_, var size) => $"Rectangle with size {size}",
    _ => "another shape"
  };

christiannagel

static string M2(Shape shape)
  => shape switch
  {
    Shape s when s.Size.height > 100 => $"large shape with size {s.Size} at position {s.Position}",
    Ellipse e => $"Ellipse with size {e.Size} at position {e.Position}",
    Rectangle r => $"Rectangle with size {r.Size} at position {r.Position}",
    _ => "another shape"
  };

christiannagel

static void Main()
{
  var r1 = new Rectangle(position: (200, 200), size: (200, 200));
  var e1 = new Ellipse(position: (80, 1400), size: (80, 140));
  var shapes = new Shape[]
  {
    r1,
    e1,
    new Circle((40, 60), 90),
    new CombinedShape(r1, e1)

christiannagel

public abstract class Shape
{
  public (int x, int y) Position { get; }
  public (int height, int width) Size { get; }
  
  public Shape((int x, int y) position, (int height, int width) size)
    => (Position, Size) = (position, size);

  public void Deconstruct(out (int x, int y) position, out (int x, int y) size)
    => (position, size) = (Position, Size);

christiannagel

static string M1(Shape shape)
{
  switch (shape)
  {
    case Shape s when s.Size.height > 100:
      return $"large shape with size {s.Size} at position {s.Position}";
    case Ellipse e:
      return $"Ellipse with size {e.Size} at position {e.Position}";
    case Rectangle r:
      return $"Rectangle with size {r.Size} at position {r.Position}";

christiannagel

var glory = new NewAndGlory();
string s1 = glory.GetANullString();
string s2 = glory.GetAString();
string s3 = glory.PassAString(null);  // having a NullReferenceException here!

christiannagel

public string GetIsbn2(Book book)
  => book.Isbn ?? string.Empty;