Decimal.ToUInt64“对于UInt64，值太大或太小 [英] Decimal.ToUInt64 "Value was either too large or too small for a UInt64

问题描述

我正在做--

Decimal production = 0;
Decimal expense = 5000;

Decimal.ToUInt64(production - expense);

但是它会引发异常并显示以下错误消息.

But it throws exception with the following error message.

"Value was either too large or too small for a UInt64"

有人可以给我解决方法吗?

Can someone give me a workaround for this.

谢谢！

无论如何，我希望结果为正数.

In any case, I want the result as a positive number.

推荐答案

问题:-5000m是负数，超出了UInt64( unsigned 类型)的范围.

Problem: -5000m is a negative number, which is outside the range of UInt64 (an unsigned type).

解决方案:如果要处理负数，请使用Int64而不是UInt64.

Solution: use Int64 instead of UInt64 if you want to cope with negative numbers.

请注意，您可以直接投射而不是调用Decimal.To...:

Note that you can just cast instead of calling Decimal.To...:

long x = (long) (production - expense);

替代方法:在尝试转换数字之前，请先验证该数字是否为负数，然后按照您认为合适的方式对其进行处理.

Alternative: validate that the number is non-negative before trying to convert it, and deal with it however you deem appropriate.

一个非常狡猾的选择:如果您真的想要绝对值(似乎不太可能)，则可以使用

Very dodgy alternative: if you really just want the absolute value (which seems unlikely) you could use Math.Abs:

UInt64 alwaysNonNegative = Decimal.ToUInt64(Math.Abs(production - expense));

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