rspec/rules/S4056/csharp/rule.adoc

When a ``++System.Globalization.CultureInfo++`` or ``++IFormatProvider++`` object is not supplied, the default value that is supplied by the overloaded member might not have the effect that you want in all locales.

You should supply culture-specific information according to the following guidelines:

* If the value will be displayed to the user, use the current culture. See ``++CultureInfo.CurrentCulture++``.
* If the value will be stored and accessed by software (persisted to a file or database), use the invariant culture. See ``++CultureInfo.InvariantCulture++``.
* If you do not know the destination of the value, have the data consumer or provider specify the culture.

This rule raises an issue when a method or constructor calls one or more members that have overloads that accept a ``++System.IFormatProvider++`` parameter, and the method or constructor does not call the overload that takes the ``++IFormatProvider++`` parameter. This rule ignores calls to .NET Framework methods that are documented as ignoring the ``++IFormatProvider++`` parameter as well as the following methods:

* ``++Activator.CreateInstance++``
* ``++ResourceManager.GetObject++``
* ``++ResourceManager.GetString++``


== Noncompliant Code Example

----
using System;

namespace MyLibrary
{
    public class Foo
    {
        public void Bar(String string1)
        {
            if(string.Compare(string1, string2, false) == 0) // Noncompliant
            {
                Console.WriteLine(string3.ToLower()); // Noncompliant
            }
        }
    }
}
----


== Compliant Solution

----
using System;
using System.Globalization;

namespace MyLibrary
{
    public class Foo
    {
        public void Bar(String string1, String string2, String string3)
        {
            if(string.Compare(string1, string2, false, 
                              CultureInfo.InvariantCulture) == 0)
            {
                Console.WriteLine(string3.ToLower(CultureInfo.CurrentCulture));
            }
        }
    }
}
----


== Exceptions

This rule will not raise an issue when the overload is marked as obsolete.


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