How to make doubles always contain a . character?

I noticed my doubles contain different precision characters depending on regional settings.

For example:

3,47 or 3.45

How can I enforce the double should a开发者_StackOverflow社区lways contain a . precision character?

Problem is once I serialize the class containing this double to XML, it gets shipped to other systems expecting a standard result.

So after reading your responses (and thanks), do you guys recommend changing the property to a string, (making the replacements in a string), so that it serializes with the string value (not the double)?

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You need to put the double to string using the Invariant Culture.

double d = 3.47;
Console.WriteLine(d.ToString(CultureInfo.InvariantCulture));

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You will need to format with the InvariantCulture.

Note that the "." and "," formatting characters are interpreted according to the culture settings.

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This little tutorial will be the answer you need, I expect: http://www.java2s.com/Tutorial/CSharp/0440__I18N-Internationalization/Parsingnumberswithcultureinvariantparsing.htm

double.Parse(numberString, CultureInfo.InvariantCulture);

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The double itself doesn't include a "." or a ",", only the print out of the representation does. You can read up on custom formats here.

[Update according to OP]
I don't know exactly what your design looks like, but it would probably be smart to create a string property on your DTO, which would output the formatted string of your double, and then mark your double property as not serializable.

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When you need to do this for all numbers in your current applicaton, you can use the following to set it application-wide (new threads will inherit this setting):

// use this statement to force the default:
Application.CurrentCulture = CultureInfo.InvariantCulture;
string s = myNumber.ToString();

// for one number you have to remember to use:
string s = myNumber.ToString(CultureInfo.InvariantCulture);

Note: by default, your application, whether ASP.NET or WinForms, will use the culture settings of the system it is running on (in ASP.NET, you can set the culture globally in the web.config).