从double转换为int的最佳(最安全)方法

问题描述

我对将双精度型转换为int的最佳方法感到好奇.在此，运行时安全是我的主要关注点(不一定是最快的方法，但这是我的次要关注点).我留下了一些我可以在下面提出的选择.任何人都可以权衡哪种最佳做法吗?没有列出的更好的方法来实现这一点?

I'm curious as to the best way to convert a double to an int. Runtime safety is my primary concern here (it doesn't necessarily have to be the fastest method, but that would be my secondary concern). I've left a few options I can come up with below. Can anyone weigh in on which is best practice? Any better ways to accomplish this that I haven't listed?

        double foo = 1;
        int bar;

        // Option 1
        bool parsed = Int32.TryParse(foo.ToString(), out bar);
        if (parsed)
        {
            //...
        }

        // Option 2
        bar = Convert.ToInt32(foo);

        // Option 3
        if (foo < Int32.MaxValue && foo > Int32.MinValue) { bar = (Int32)foo; }

推荐答案

我认为您最好的选择是:

I think your best option would be to do:

checked
{
    try
    {
        int bar = (int)foo;
    }
    catch (OverflowException)
    {
     ...
    }
}

来自显式数值转换表

注意:选项2 还会在出现OverflowException时抛出OverflowException必填.

Note: Option 2 also throws an OverflowExceptionwhen required.

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