vb.net 语言不变 Double.ToString()
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Language invariant Double.ToString()
提问by f1wade
I am passing a double across a network, currently I do
我正在通过网络传递一个双倍，目前我这样做
double value = 0.25;
string networkMsg = "command " + value;
the networkMsgis fine in english where its 0.25 and french where its 0,25, but when i go from a french computer to an english computer one side is making it 0.25 and the other is trying to read 0,25.
的networkMsg是英文得很好，它的0.25和法国在那里的0.25，但是当我从法国计算机去参加英语计算机一面使它0.25，另一种是试图读取0.25。
So i can to use region invariant methods in my code.
所以我可以在我的代码中使用区域不变方法。
I have found Val(networkMsg) that will always read 0.25 no matter the region.
我发现networkMsg无论在哪个地区，Val( ) 的读数总是 0.25。
but I cannot find a guaranteed way of converting from value to 0.25 region invariant.
would value.toString("0.0")work?
但我找不到从值转换为 0.25 区域不变量的有保证的方法。会value.toString("0.0")工作吗？
回答by Marc Gravell
The .in the format specifier "0.0"doesn't actually mean "dot" - it means "decimal separator" - which is ,in France and several other European cultures. You probably want:
该.格式说明"0.0"，实际上并不意味着“点” -它的意思是“小数点分隔符” -这是,在法国和其他一些欧洲文化。你可能想要：
value.ToString(CultureInfo.InvariantCulture)
or
或者
value.ToString("0.0", CultureInfo.InvariantCulture)
For info, you can see this (and many other things) by inspecting the frculture:
有关信息，您可以通过检查fr文化来看到这一点（以及许多其他内容）：
var decimalSeparator = CultureInfo.GetCultureInfo("fr")
.NumberFormat.NumberDecimalSeparator;
回答by Jeppe Stig Nielsen
Use:
用：
string networkMsg = "command " + value.ToString(CultureInfo.InvariantCulture);
or:
或者：
string networkMsg = string.Format(CultureInfo.InvariantCulture, "command {0}", value);
This needs using System.Globalization;in the top of your file.
这需要using System.Globalization;在您的文件的顶部。
Note: If you need full precision, so that you can restore the exact double again, use the Formatsolution with the roundtrip format{0:R}, instead of just {0}. You can use other format strings, for example {0:N4}will insert thousands separators and round to four dicimals (four digits after the decimal point).
注意：如果您需要全精度，以便您可以再次恢复精确的双精度值，请使用Format具有往返格式的解决方案{0:R}，而不仅仅是{0}. 您可以使用其他格式字符串，例如{0:N4}将插入千位分隔符并四舍五入为四个小数（小数点后四位）。
Since C# 6.0 (2015), you can now use:
从 C# 6.0 (2015) 开始，您现在可以使用：
string networkMsg = FormattableString.Invariant($"command {value}");
回答by Jon
Specify the invariant culture as the format provider:
将固定区域性指定为格式提供程序：
value.ToString(CultureInfo.InvariantCulture);
