c# 7.0 学习笔记

refer : https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-7

out 可以写在里面了

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

return result;

Local functions, 终于有了, 写习惯 js 的我超爱 

[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";
}