/// <summary>
/// Checks wheter a given DateTime is an invalid date. A check whether it is an undefined DateTime is always performed.
/// If Delegate <see cref="SharedGetDateVerificationResultDelegate" /> is set up and Argument
/// <paramref name="AResultControl" /> isn't null, the 'DateVerificationResult' of the TtxtPetraDate Control is
/// returned by this Method through this Method if it isn't null. That way the Data Validation Framework can
/// use the detailed Data Verification error that is held by the Control.
/// </summary>
/// <returns>Null if validation succeeded, otherwise a <see cref="TVerificationResult" /> is
/// returned that contains details about the problem.</returns>
public static TVerificationResult IsNotInvalidDate(DateTime? ADate, String ADescription,
TVerificationResultCollection AVerificationResultCollection, bool ATreatNullAsInvalid = false,
object AResultContext = null, System.Data.DataColumn AResultColumn = null,
Control AResultControl = null)
{
TVerificationResult VerificationResult;
if (FDelegateSharedGetDateVerificationResult != null)
{
if ((AResultControl != null))
{
VerificationResult = FDelegateSharedGetDateVerificationResult(AResultControl);
if (VerificationResult == null)
{
VerificationResult = TDateChecks.IsNotUndefinedDateTime(ADate,
ADescription, ATreatNullAsInvalid, AResultContext, AResultColumn, AResultControl);
}
else
{
VerificationResult.OverrideResultContext(AResultContext);
VerificationResult = new TScreenVerificationResult(VerificationResult, AResultColumn, AResultControl);
}
}
else
{
VerificationResult = TDateChecks.IsNotUndefinedDateTime(ADate,
ADescription, ATreatNullAsInvalid, AResultContext, AResultColumn, AResultControl);
}
// Remove Verification Result that would have been recorded earlier for the same DataColumn
TVerificationResult OtherRecordedVerificationResult = AVerificationResultCollection.FindBy(AResultColumn);
if (OtherRecordedVerificationResult != null)
{
AVerificationResultCollection.Remove(OtherRecordedVerificationResult);
}
}
else
{
VerificationResult = TDateChecks.IsNotUndefinedDateTime(ADate,
ADescription, ATreatNullAsInvalid, AResultContext, AResultColumn, AResultControl);
}
return VerificationResult;
}