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
     
       Index(){    string abc = dada();    string dada()    {        return "a";    }}
     

 

getter setter 

// Expression-bodied constructorpublic 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";}