如何防止零除？

Question

ads = ads.Where(x => (x.Amount - x.Price) / (x.Amount / 100) >= filter.Persent);

如果x.Amount == 0我有错误"遇到零除错误".

喜欢我在这个要求是避免？

更新:

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);

还有另外一种方法吗？

Answer 1

当然,您始终可以实现通用的安全除法方法并一直使用它

using System;

namespace Stackoverflow
{
    static public class NumericExtensions
    {
        static public decimal SafeDivision(this decimal Numerator, decimal Denominator)
        {
            return (Denominator == 0) ? 0 : Numerator / Denominator;
        }
    }

}

我选择了十进制类型,因为它解决了我所知道的所有非可空数字类型.

用法:

var Numerator = 100;
var Denominator = 0;

var SampleResult1 = NumericExtensions.SafeDivision(Numerator , Denominator );

var SampleResult2 = Numerator.SafeDivision(Denominator);

Answer 2

ads = ads.Where(x => x.Amount != 0 &&
                    (x.Amount - x.Price) / (x.Amount / 100) >= filter.Persent);