CSharp: How to format a double value according to culture-specific formatting in Unity C#

Numbers are formatted differently in various cultures (locale). Every locale follows different standards.

For simplicity, let us consider how decimals and thousands are separated in two cultures (locales).

• en-US (US English) 🇺🇸
• de-DE (DE Deutsch) 🇩🇪

Decimal separator

• In “en-US” period (.) is used to separate the decimals.
• For example, $100.00 or 10.00
• In “de-DE” comma (,) is used to separate the decimals.
  For example, 100,00€ or 10,00

Thousands separator

• In “en-US” comma (,) is used to separate the thousands.
• For example, $1,000.00 or 1,000.00
• In “de-DE” period (.) is used to separate the thousands.
  For example, 1.000,00€ or 1.000,00

To learn more, refer to Number formatting documentation.

If you are developing applications in Unity using C#. You would like to format according to different cultures. Here is how you can format double data type according to locale using C# in Unity project,

using System.Collections.Generic;
using System.Globalization;

public class ExampleFormatDoubleValues : MonoBehaviour
{
   
	double inputValueDouble = 79.00;

	string outputValueDoubleString = string.Format(CultureInfo.InvariantCulture, "{0}", inputValueDouble);

	// Output according to different cultures
	// if culture is en-US then output is 79.00
	// if culture is de-DE then output is 79,00
	
}

In the above code example,

• the value 79.00 is stored in inputValueDouble.
• It is converted using the method String.Format Method — Format(IFormatProvider, String, Object[])
• The IFormatPorvider is CultureInfo.InvariantCulture
• The string is "{0}
• The Object[] is inputValueDouble
• The converted value is stored in outputValueDoubleString

To learn more, refer to System.Collections.Generic Namespace and CultureInfo Class.

I hope my article helps you understand how to work with string format for formatting different data types in Unity using C#.

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