C# 如何防止被零除？
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How to prevent division by zero?
提问by Mediator
ads = ads.Where(x => (x.Amount - x.Price) / (x.Amount / 100) >= filter.Persent);
if x.Amount == 0 I have error "Divide by zero error encountered."
如果 x.Amount == 0 我有错误“遇到除以零错误。”
like me in this request is to avoid?
像我这样的要求是为了避免？
update:
更新：
this helped, but I do not like the decision:
这有帮助，但我不喜欢这个决定：
ads = ads.Where(x => (x.Amount - x.Price) / ((x.Amount / 100)==0?0.1:(x.Amount / 100)) >= filter.Persent);
there is another way?
还有另一种方法吗？
采纳答案by Jon
ads = ads.Where(x => x.Amount != 0 &&
(x.Amount - x.Price) / (x.Amount / 100) >= filter.Persent);
回答by Julio Nobre
Of course, you can always implement a generic safe division method and use it all the way
当然，你可以随时实现一个通用的安全除法方法，并一路使用
using System;
namespace Stackoverflow
{
static public class NumericExtensions
{
static public decimal SafeDivision(this decimal Numerator, decimal Denominator)
{
return (Denominator == 0) ? 0 : Numerator / Denominator;
}
}
}
I have chosen decimaltype because it addresses all non nullable numeric types that I am aware of.
我选择了十进制类型，因为它解决了我知道的所有不可为空的数字类型。
Usage:
用法：
var Numerator = 100;
var Denominator = 0;
var SampleResult1 = NumericExtensions.SafeDivision(Numerator , Denominator );
var SampleResult2 = Numerator.SafeDivision(Denominator);
