چیت‌شیت C#

1string displayName = input?.Trim() is { Length: > 0 } name2    ? name3    : "Guest";

1public sealed record Product(2    string Sku,3    string Name,4    decimal Price);

1static string Describe(object value) => value switch2{3    int number when number >= 0 => $"positive: {number}",4    int => "negative",5    string text => $"text: {text}",6    null => "missing",7    _ => "other"8};

1static async Task<string> LoadAsync(2    HttpClient client,3    Uri uri,4    CancellationToken cancellationToken)5{6    return await client.GetStringAsync(uri, cancellationToken);7}

1Task<User> userTask = LoadUserAsync(userId, token);2Task<IReadOnlyList<Order>> ordersTask = LoadOrdersAsync(userId, token);34await Task.WhenAll(userTask, ordersTask);5var summary = new Summary(userTask.Result, ordersTask.Result);

1await using var stream = await file.OpenReadAsync();2using var reader = new StreamReader(stream);3string contents = await reader.ReadToEndAsync();