C# string.Format（…；，double）后跟double.Parse，使用相同的NumberFormatInfo会导致FormatException。为什么？

最后一行抛出一个

FormatException

，我不知道为什么。我试图解析的字符串实际上来自以下内容：

NumberFormatInfo nfi = new NumberFormatInfo()
{
    CurrencySymbol = "$$s. ",
    CurrencyGroupSeparator = ".",
    CurrencyDecimalSeparator = ",",
    NegativeSign = "-",
    CurrencyNegativePattern = 2
};

double amount = double.Parse("$$s. 1.123,00", nfi);

---

你没有告诉它应该接受货币价值。为此，您需要调用一个重载，该重载接受一个

NumberStyles

值，并包含

NumberStyles.AllowCurrencySymbol

。例如：

String.Format(nfi, "{0:C}", 1123.00)

请注意，货币值通常用

decimal

表示比用

double

表示更好

using System;
using System.Globalization;

class Test
{
    static void Main()
    {
        NumberFormatInfo nfi = new NumberFormatInfo()
        {
            CurrencySymbol = "$$s. ",
            CurrencyGroupSeparator = ".",
            CurrencyDecimalSeparator = ",",
            NegativeSign = "-",
            CurrencyNegativePattern = 2
        };

        double d = double.Parse("$$s. 1.123,00",
            NumberStyles.Number | NumberStyles.AllowCurrencySymbol,
            nfi);
        Console.WriteLine(d);
    }
}