/// <summary>
/// Retrieves a tolling letter by tolling letter ID.
/// </summary>
/// <param name="letterID">The ID of the tolling letter to retrieve.</param>
/// <returns>The tolling letter designated by the specified ID if found; otherwise, null.</returns>
public TollingLetter GetTollingLetter(int letterID)
{
using (Data.CPEntities context = new Data.CPEntities())
{
return CreateTollingLetter(context.TollingLetters.FirstOrDefault(l => l.LetterId == letterID));
}
}
/// <summary>
/// Retrieves a collection of all known tolling letters.
/// </summary>
/// <returns>A collection of all known tolling letter.</returns>
public List<TollingLetter> GetTollingLetters()
{
using (Data.CPEntities context = new Data.CPEntities())
{
return context.TollingLetters.AsEnumerable().Select(l => CreateTollingLetter(l)).ToList();
}
}
/// <summary>
/// Retrieves a tolling letter by tolling codes.
/// </summary>
/// <param name="sourceCode">The tolling source code to match.</param>
/// <param name="eventCode">The tolling event code to match.</param>
/// <param name="typeCode">The tolling type code to match.</param>
/// <returns>The tolling letter designated by the specified tolling codes if found; otherwise, null.</returns>
public TollingLetter GetTollingLetter(string sourceCode, string eventCode, string typeCode)
{
using (Data.CPEntities context = new Data.CPEntities())
{
return CreateTollingLetter(context.TollingLetters.FirstOrDefault(l => l.TollingSource.Code == sourceCode && l.TollingEvent.Code == eventCode && l.TollingType.Code == typeCode));
}
}
