什么是转换双为int的最佳途径。使用CAST？

What is the best way to convert a double to Int. Use cast?

推荐答案

您可以使用强制转换，如果你想默认截断向零行为。或者，你可能想使用 Math.Ceiling ， Math.Round ， Math.Floor 等等 - 但你仍然需要一个演员之后

You can use a cast if you want the default truncate-towards-zero behaviour. Alternatively, you might want to use Math.Ceiling, Math.Round, Math.Floor etc - although you'll still need a cast afterwards.

不要忘了 INT 的范围比的范围更小的双。强制转换从双到 INT 如果该值的范围之外会不会引发异常 INT 在一个未经检查的情况下，而呼叫 Convert.ToInt32（双）会。中投（在未经检查的情况下）的结果是明确的，如果没有定义的值范围之外。

Don't forget that the range of int is much smaller than the range of double. A cast from double to int won't throw an exception if the value is outside the range of int in an unchecked context, whereas a call to Convert.ToInt32(double) will. The result of the cast (in an unchecked context) is explicitly undefined if the value is outside the range.