带有格式提供程序的 Expression.ToString()

发布于 2024-12-21 04:19:52 字数 345 浏览 3 评论 0原文

是否可以转换像 x => 这样的 lambda 表达式？ x + 1.5 使用特定区域性/格式选项来字符串？我知道我可以这样做：

Expression<Func<double,double>> expr = x => x + 1.5;
string s = expr.Body.ToString();

但是通过某些应用程序语言设置，它给出的 s 等于 "x + 1,5" （用逗号而不是点）。看来 ToString() 获取当前的文化信息。

如何以文化不变的原始形式恢复字符串？

原文

Is it possible to convert a lambda expression like x => x + 1.5 to string using specific culture/format options? I know I can do:

Expression<Func<double,double>> expr = x => x + 1.5;
string s = expr.Body.ToString();

But with some app language settings it gives s equal to "x + 1,5" (with a comma instead of a dot). It seems that ToString() takes current culture info.

How to get back the string in its original form, culture-invariant?

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绾颜 2024-12-28 04:19:53

有一种方法可以做到，但它真的很难看......只是暂时改变当前的文化：

var previousCulture = Thread.CurrentThread.CurrentCulture;
try
{
    Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
    Expression<Func<double,double>> expr = x => x + 1.5;
    string s = expr.Body.ToString();
}
finally
{
    Thread.CurrentThread.CurrentCulture = previousCulture;
}

There is a way to do it, but it's really ugly... just change the current culture temporarily:

var previousCulture = Thread.CurrentThread.CurrentCulture;
try
{
    Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
    Expression<Func<double,double>> expr = x => x + 1.5;
    string s = expr.Body.ToString();
}
finally
{
    Thread.CurrentThread.CurrentCulture = previousCulture;
}

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