.NET NFC library for Android.
uses Android NFC API
provides reading, writing and formatting NFC tags
supports NDEF, NFC-A, NFC-V, MIFARE Classic and MIFARE Ultralight tags
source code included in registered version
royalty free distribution in applications

Library API

	public class NfcTag
	{
		public NfcTag(Tag tag);
		public NfcTag(Activity activity, Intent intent);

		public string Id { get; }
		public MifareClassicTag MifareClassicTag { get; }
		public MifareUltralightTag MifareUltralightTag { get; }
		public NdefFormatableTag NdefFormatableTag { get; }
		public NdefTag NdefTag { get; }
		public NfcATag NfcATag { get; }
		public NfcVTag NfcVTag { get; }
		public Tag Tag { get; }
		public string[] TechList { get; }

		public string GetId(char separator = ':');
	}

	public class NdefTag
	{
		public NdefTag(Ndef ndef);

		public bool CanMakeReadOnly { get; }
		public bool IsWritable { get; }
		public NdefItem[] Items { get; }
		public int MaxSize { get; }
		public Ndef Ndef { get; }
		public NdefRecord[] Records { get; }
		public Tag Tag { get; }
		public string Type { get; }

		public bool MakeReadOnly();
		public bool Write(NdefMessage message);
		public bool Write(NdefItem item);
		public bool Write(params NdefItem[] items);
	}

	public class NdefItem
	{
		public NdefItem(NdefRecord ndefRecord);

		public string ExternalText { get; }
		public bool IsAbsoluteUri { get; }
		public bool IsEmpty { get; }
		public bool IsExternalType { get; }
		public bool IsMimeMedia { get; }
		public bool IsText { get; }
		public bool IsUnchanged { get; }
		public bool IsUnknown { get; }
		public bool IsUri { get; }
		public bool IsWellKnown { get; }
		public NdefRecord NdefRecord { get; }
		public byte[] Payload { get; }
		public string PayloadUtf8 { get; }
		public string Text { get; }
		public string TextLanguageCode { get; }
		public string TnfDescription { get; }
		public string Uri { get; }

		public static NdefItem CreateApplicationItem(string packageName);
		public static NdefItem CreateExternalItem(string domain, string type, byte[] data);
		public static NdefItem CreateMimeItem(string mimeType, byte[] mimeData);
		public static NdefItem CreateTextItem(string text, string languageCode = "en");
		public static NdefItem CreateUriItem(string uri);
	}

	public class NfcATag
	{
		public NfcATag(NfcA nfcA);

		public byte[] Atqa { get; }
		public int MaxTransceiveLength { get; }
		public NfcA NfcA { get; }
		public short Sak { get; }
		public Tag Tag { get; }
		public int Timeout { get; set; }

		public byte[] Transceive(byte[] data);
	}

	public class NfcVTag
	{
		public NfcVTag(NfcV nfcV);

		public int BlockCount { get; }
		public int BlockSize { get; }
		public sbyte DsfId { get; }
		public int Ic { get; }
		public int MaxTransceiveLength { get; }
		public NfcV NfcV { get; }
		public sbyte ResponseFlags { get; }
		public byte[] SystemInformation { get; }
		public Tag Tag { get; }

		public byte[] EasAlarm();
		public byte[] GetInventory();
		public byte[] LockAfi(byte afi);
		public byte[] LockBlock(byte block);
		public byte[] LockDsfid();
		public byte[] LockEas();
		public byte[] ReadBlock(byte block);
		public byte[] ReadBlocks(byte firstBlock, byte blockCount);
		public byte[] ResetEas();
		public byte[] ResetToReady();
		public byte[] Security(byte firstBlock, byte blockCount);
		public byte[] SetEas();
		public byte[] Transceive(byte[] data);
		public byte[] WriteAfi(byte afi);
		public byte[] WriteBlock(byte block, byte[] data);
		public byte[] WriteBlocks(byte firstBlock, byte blockCount, byte[] data);
		public byte[] WriteDsfid(byte dsfid);
	}

	public class MifareClassicTag
	{
		public MifareClassicTag(MifareClassic mifareClassic);

		public static int BlockSize { get; }
		public int BlockCount { get; }
		public int MaxTransceiveLength { get; }
		public MifareClassic MifareClassic { get; }
		public int SectorCount { get; }
		public int Size { get; }
		public Tag Tag { get; }
		public int Timeout { get; set; }
		public MifareClassicType Type { get; }
		public string TypeDescription { get; }

		public byte[] ReadBlock(int blockIndex);
		public byte[][] ReadBlocks();
		public byte[] ReadData();
	}

	public class MifareUltralightTag
	{
		public MifareUltralightTag(MifareUltralight mifareUltralight);

		public static int PageSize { get; }
		public int MaxTransceiveLength { get; }
		public MifareUltralight MifareUltralight { get; }
		public int PageCount { get; }
		public Tag Tag { get; }
		public int Timeout { get; set; }
		public MifareUltralightType Type { get; }
		public string TypeDescription { get; }

		public byte[] ReadData();
		public byte[] ReadPage(int pageOffset);
		public byte[][] ReadPages();
		public void WritePage(int pageOffset, byte[] data);
		public void WritePages(int firstPageOffset, byte[][] data);
	}

	public class NdefFormatableTag
	{
		public NdefFormatableTag(NdefFormatable ndefFormatable);

		public NdefFormatable NdefFormatable { get; }
		public Tag Tag { get; }

		public bool Format();
		public bool FormatReadOnly();
	}

Only for V.I.P