为[ double ] 类型 添加[zzzzz]方法

class Program

{

static void Main(string[] args)

{

double v1 = 123;

double p1 = v1.zzzzz();

System.Console.WriteLine(p1);

//--

double p2=(1234567890.123).zzzzz();

System.Console.WriteLine(p2);

}

}

static class myExtension

{

public static double zzzzz(this double d)

{

return d/2 ;

}

}