ToDouble() 不工作？

Question

我正在尝试执行以下代码行，但出现错误：

var distanceTravelRight = 10.0;
var tick = DateTime.Now.Ticks();
var velLeft = distanceTravelRight / tick.ToDouble;

Non-invocable member 'System.DateTime.Ticks' cannot be used like a method.

'string' does not contain a definition for 'ToDouble' and no extension method 'ToDouble' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)

如果有人能指出问题以便我学习，我将不胜感激！

Answer 1

Ticks 是一个属性，不是一个方法，所以你不需要用括号 ().

来调用它

var tick = DateTime.Now.Ticks;

此外，要将字符串转换为双精度数，请使用 double.TryParse。

double yourDouble;
if (double.TryParse(yourString, out yourDouble)) 
{
   // It is safe to use `yourDouble` here
}

ToDouble() 不工作？

ToDouble() is not working?

c#

compiler-errors