out 可以寫在裏面了

// int result = 0; 不需要寫在外面了 
if (!int.TryParse(input, out int result))
{    
    return null;
}

return result;

Local functions, 終於有了, 寫習慣 js 的我超愛

[Route("")]
public async Task<IActionResult> Index()
{
    string abc = dada();
    string dada()
    {
        return "a";
    }
}

getter setter

// Expression-bodied constructor
public ExpressionMembersExample(string label) => this.Label = label;

// Expression-bodied finalizer
~ExpressionMembersExample() => Console.Error.WriteLine("Finalized!");

private string label;

// Expression-bodied get / set accessors.
public string Label
{
    
 
get => label;
    set => this.label = value ?? "Default label";
}

c# 7.0 學習筆記