c# - ToDouble() 不工作？

Question

我正在尝试执行以下代码行，但它给我错误:

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，而不是一个方法，因此您不需要使用括号 () 调用它。

var tick = DateTime.Now.Ticks;

此外，要将字符串转换为 double ，请使用 double.TryParse。

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