Question

I would like to change the default ErrorMessage which we get on validation in Entity Framework 4.3. We found LanguagePacks for EF4.1 but aren’t there any LanguagePacks for 4.3 available?

Answer 1

We solved this issue by manually translating all the validation messages we came across!
We used some regular expressions to extract the message-resource string from the final error message.

    private static Dictionary<string, string> _errorTranslation;

    private static string TranslateErrorMessage(string errorMessage)
    {
        if (_errorTranslation == null)
        {
            _errorTranslation = new Dictionary<string, string>();

            // MaxLength-Attribute
            _errorTranslation.Add(
                @"^The field (.*) must be a string or array type with a maximum length of (.*)\.$",
                @"Das Feld $1 hat eine maximale Länge von $2.");

            // MinLength-Attribute
            _errorTranslation.Add(
                @"^The field (.*) must be a string or array type with a minimum length of (.*)\.$",
                @"Das Feld $1 hat eine minimale Länge von $2.");

            // StringLength-Attribute
            _errorTranslation.Add(
                @"^The field (.*) must be a string with a maximum length of (.*)\.$",
                @"Das Feld $1 hat eine maximale Länge von $2.");

            // Range-Attribute
            _errorTranslation.Add(
                @"^The field (.*) must be between (.*) and (.*)\.$",
                @"Das Feld $1 muss zwichen $2 und $3 liegen.");

            // Required-Attribute
            _errorTranslation.Add(
                @"^The (.*) field is required\.$",
                @"Das Feld $1 wird zwingend benötigt.");
        }

        foreach (var pattern in _errorTranslation)
            if (Regex.IsMatch(errorMessage, pattern.Key))
                return Regex.Replace(errorMessage, pattern.Key, pattern.Value);

        return errorMessage;
    }

edit
Since nobody answered since I posted my question 5 month ago we came with this bad solution. Is it a shame to ask, why am I voted down for this?