C＃乘以值int.MaxValue的两个变量不会导致发生OverflowException

问题描述

我有一个整数阵列，包含两个值，每个INT32的最大值：

I've got an integer array that contains two values, each the maximum value of int32:

int[] factors = new int[] { 2147483647, 2147483647 };

我的尝试的得到这两个数字的产品创造一个发生OverflowException：

I'm trying to get the product of these two numbers to create an OverflowException:

try
{
    int product = factors[0] * factors [1];
}
catch(Exception ex)
{
}

出乎我的意料（和沮丧），产品实际上返回值为1。这是为什么，我怎么会去当两个整数的乘积超过int.MaxValue？

Much to my surprise (and dismay), product actually returns a value of 1. Why is this, and how would I go about throwing an exception when the product of two integers exceeds int.MaxValue?

推荐答案

由于C＃的默认行为是不符合INT检查溢出。
但是，您可以通过使用关键字。

Because the default behavior of C# is not to check overflow with int.However, you can force overflow checking by using checked keyword.

try
{
    checked
    {
        int product = factors[0] * factors [1];
    }
}
catch(Exception ex)
{
}

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