Question

我会如何转换字符串, 说" -100100" 在C# 长。

目前我有一个代码线

long xi = long.Parse(x, System.Globalization.NumberStyles.AllowThousands);

但当 x 是“ 负数 ” 时此间断。

" 强 " 我的方法 :

long xi = long.Parse("-100,253,1", 
System.Globalization.NumberStyles.AllowLeadingSign & System.Globalization.NumberStyles.AllowThousands);

是错的,因为它打破了。

Answer 1

试一试:

long xi = long.Parse(x, System.Globalization.NumberStyles.AllowThousands | System.Globalization.NumberStyles.AllowLeadingSign);

It may well be because you are declaring flags you may need to declair all possible flags that will be hit. I ve just confirmed this code as working in a test project using your given string value in the question. Let me know if it meets your requirements. When declaring multiple flags in a single parameter use | instead of &

edit: http://msdn.microsoft.com/en-us/library/cc138362.aspx Find an explination of the different bitwise operators under the "Enumeration Types as Bit Flags" heading (That was harder to find than i thought.)

Answer 2

为了避免例外情况,我将使用TryParse而不是Parse, 即:

long xi;
if (long.TryParse(numberString, System.Globalization.NumberStyles.AllowThousands | System.Globalization.NumberStyles.AllowLeadingSign, null, out xi))
    {
        // OK, use xi
    }
    else
    {
        // not valid string, xi is 0
    }

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