/// <summary>
/// Ensures the mandatory placeholders are all specified in this template.
/// </summary>
public static void EnsurePlaceholders(this IEmailTemplate template)
{
// Make sure that all place holders appear in the email body or subject.
var missingElements = template.GetPlaceholderTokens().Except(t => (template.Subject + template.Body).Contains(t));
if (missingElements.Any())
{
throw new ValidationException("Email template subject or body must have all place-holders for {0}. The missing ones are: {1}", template.Key, missingElements.ToString(", "));
}
}
