如何将字符串列表转换为双精度？ [英] How to convert list of strings to doubles?

问题描述

编辑：我以前尝试过这两种方法 -

EDIT : I had tried these two ways before -

List<double> doubleList =
stringList.ConvertAll(x => (double)x);

List<double> doubleList =
stringList.Select(x =>
(double)x).ToList();

并收到此错误：

无法将类型'string'转换为'double'

Cannot convert type 'string' to'double'

我读了一些很熟悉，将int转换为双精度...但是我有需要转换为双精度列表的字符串列表ConvertAll（）不适用于Select扩展方法。任何人都可以帮助我。

I read about something similiar that convert ints to doubles...but I have List of strings which I need to convert to List of doubles and the ConvertAll() does not work neither the Select extension method. Can anyone please help me out.

推荐答案

如果您使用的是.NET 3.5或更新版本，则select方法应该可以工作： p>

The select method ought to work if you are using .NET 3.5 or newer:

List<double> result = l.Select(x => double.Parse(x)).ToList();

以下是一些示例代码：

List<string> l = new List<string> { (0.1).ToString(), (1.5).ToString() };
List<double> result = l.Select(x => double.Parse(x)).ToList();
foreach (double x in result)
{
    Console.WriteLine(x);
}

结果：

0,1
1,5

有一件事要注意的是哪种文化你正在使用来解析字符串。您可能希望使用 Parse 重载文化，并使用 CultureInfo.InvariantCulture 。

One thing to be aware of is which culture you are using to parse the strings. You might want to use the Parse overload that takes a culture and use CultureInfo.InvariantCulture for example.

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