将文本分数转换为小数 [英] Convert a text fraction to a decimal

问题描述

类似于此问题，仅使用C＃而不是JavaScript。我在搜索时找不到C＃的任何内容

Similar to this question just in C# instead of JavaScript. I couldn't find anything for C# while searching

我有一个文本框，该文本框将容纳一个数量，该数量随后以双精度形式存储在数据库中。但是，有可能会将某些数量作为字符串分数输入，例如1/2表示0.5。
我希望能够将它们转换为十进制，然后再将它们存储到数据库中（也可以转换回十进制，但这很好，但这不是必需的）。我希望能够同时处理分数和带分数2 1/2被保存为2.5

I have a text box that will take a quantity, which is later stored as a double in a database. However it is possible that some quantities will be entered as string fractions e.g 1/2 for 0.5. I want to be able to convert these to decimal before storing them to the database (being able to also convert back would be nice but not necessary). I want to be able to handle both fractions and mixed numbers e.g. 2 1/2 is saved as 2.5

有人知道这样做的方法吗？

Anybody know a way of doing this?

推荐答案

尝试在空格和斜杠上将其拆分，例如：

Try splitting it on the space and slash, something like:

double FractionToDouble(string fraction) {
    double result;

    if(double.TryParse(fraction, out result)) {
        return result;
    }

    string[] split = fraction.Split(new char[] { ' ', '/' });

    if(split.Length == 2 || split.Length == 3) {
        int a, b;

        if(int.TryParse(split[0], out a) && int.TryParse(split[1], out b)) {
            if(split.Length == 2) {
                return (double)a / b;
            }

            int c;

            if(int.TryParse(split[2], out c)) {
                return a + (double)b / c;
            }
        }
    }

    throw new FormatException("Not a valid fraction.");
}

嘿，它起作用了！还记得检查是否除以零。结果将得到Infinity，-Infinity或NaN。

Hey, it worked! Remember to check for a division by zero, too. You'll get Infinity, -Infinity, or NaN as a result.

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