/// <summary>
/// Create the payload based on the data stored in the properties. Usually called
/// automatically when changing properties, but you might need to call this manually
/// if you modify the list of alternative carrier records directly without using
/// accessor method provided by this class.
/// </summary>
/// <exception cref="NdefException">Thrown if unable to assemble the payload.
/// The exception message contains further details about the issue.</exception>
public void AssemblePayload()
{
if (_handoverVersion == null)
{
throw new NdefException(NdefExceptionMessages.ExHandoverInvalidVersion);
}
// Convert child records to message
var childMsg = new NdefMessage();
if (_handoverAlternativeCarrierRecords != null)
{
childMsg.AddRange(_handoverAlternativeCarrierRecords);
}
if (_handoverErrorRecord != null)
{
childMsg.Add(_handoverErrorRecord);
}
var childBytes = childMsg.ToByteArray();
var newPayload = new byte[childBytes.Length + 1];
// Frist byte: handover version
newPayload[0] = _handoverVersion.Version;
// Rest of the payload: child message containing Alternative Carrier records + Error record
Array.Copy(childBytes, 0, newPayload, 1, childBytes.Length);
_payload = newPayload;
}
/// <summary>
/// Reverse function to parseRecords() - this one takes
/// the information stored in the individual record instances and assembles
/// it into the payload of the base class.
/// </summary>
/// <remarks>
/// As the URI is mandatory, the payload will not be assembled
/// if no URI is defined.
/// </remarks>
/// <returns>Whether assembling the payload was successful.</returns>
private bool AssemblePayload()
{
// Uri is mandatory - don't assemble the payload if it's not set
if (RecordUri == null)
{
return(false);
}
// URI (mandatory)
var message = new NdefMessage {
RecordUri
};
// Title(s) (optional)
if (Titles != null && Titles.Count > 0)
{
message.AddRange(Titles);
}
// Action (optional)
if (ActionInUse())
{
message.Add(_recordAction);
}
// Size (optional)
if (SizeInUse())
{
message.Add(_recordSize);
}
// Mime Type (optional)
if (MimeTypeInUse())
{
message.Add(_recordMimeType);
}
// Image (optional)
if (ImageInUse())
{
message.Add(_recordImage);
}
SetPayloadAndParse(message.ToByteArray(), false);
return(true);
}