丟擲表示式

C#7.0 允許在某些地方作為表示式投擲：

class Person
{
    public string Name { get; }

    public Person(string name) => Name = name ?? throw new ArgumentNullException(nameof(name));

    public string GetFirstName()
    {
        var parts = Name.Split(' ');
        return (parts.Length > 0) ? parts[0] : throw new InvalidOperationException("No name!");
    }

    public string GetLastName() => throw new NotImplementedException();
}

在 C#7.0 之前，如果要從表示式主體中丟擲異常，則必須：

var spoons = "dinner,desert,soup".Split(',');

var spoonsArray = spoons.Length > 0 ? spoons : null;

if (spoonsArray == null) 
{
    throw new Exception("There are no spoons");
}

要麼

var spoonsArray = spoons.Length > 0 
    ? spoons 
    : new Func<string[]>(() => 
      {
          throw new Exception("There are no spoons");
      })();

在 C#7.0 中，上面現在簡化為：

var spoonsArray = spoons.Length > 0 ? spoons : throw new Exception("There are no spoons");