Why does my foreach loop automatically jump to the third value in the collection?

Question

I've come across something very peculiar, I'm utilizing resource files for string translation on a work project, and at the moment I have a piece of code which iterates through those resource files to find the localized versions of the Questions and Answers pertaining to a FAQ page, then loop through them and render them on a page.

The trouble is, one of my loops works perfect, but the other simply skips straight to Answer2!

My code is below, I really can't understand why 2 pieces of code exactly the same yield different results!

if (LanguageStrings.Culture == null)
{
    LanguageStrings.Culture = new CultureInfo("en-gb");
    LanguageStrings_FAQ.Culture = new CultureInfo("en-gb");
    LanguageStrings_FAQAnswers.Culture = new CultureInfo("en-gb");
}

CultureInfo ResxCulture = new CultureInfo(LanguageStrings.Culture.Name);
List<string> FAQQuestions = new List<string>();

ResourceSet RS = LanguageStrings_FAQ.ResourceManager.GetResourceSet(ResxCulture, true, true);

foreach (DictionaryEntry entry in RS)
{
    FAQQuestions.Add(entry.Value.ToString());
}

List<string> FAQAnswers = new List<string>();

ResourceSet RSAnswers = LanguageStrings_FAQAnswers.ResourceManager.GetResourceSet(ResxCulture, true, true);

foreach (DictionaryEntry entry in RSAnswers)
{
    FAQAnswers.Add(entry.Value.ToString());
}

The first item in RS is 0, which has a key of Questions0 as I'd expect, but in the second loop index 0 is Answers2!

Could anyone give me a pointer as to why this situation is occurring?

Answer 1

You get the "wrong" element of the collection because ResourceSet is unordered:

The ResourceSet class enumerates over an IResourceReader, loading every name and value, and storing them in a Hashtable.

Whenever a HashTable is used, the order of iteration is unspecified. If you would like your resources to come in a specific order, you need to order them yourself, for example, by applying OrderBy by some property.