在Win10中识别BLE写入和通知中的大数据的最后一个数据包，可以使用以下代码示例：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Windows.Devices.Bluetooth;
using Windows.Devices.Bluetooth.GenericAttributeProfile;
using Windows.Devices.Enumeration;

namespace BLEDataHandling
{
    public class BLEDataHandler
    {
        private GattCharacteristic _characteristic;
        private List _receivedData;

        public event EventHandler DataReceived;

        public async Task InitializeAsync()
        {
            // 获取BLE设备
            string deviceSelector = BluetoothLEDevice.GetDeviceSelectorFromConnectionStatus(BluetoothConnectionStatus.Connected);
            DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(deviceSelector);

            // 连接到BLE设备
            BluetoothLEDevice device = await BluetoothLEDevice.FromIdAsync(devices[0].Id);

            // 获取Gatt服务
            GattDeviceServicesResult servicesResult = await device.GetGattServicesAsync();
            GattDeviceService service = servicesResult.Services.FirstOrDefault(s => s.Uuid == GattServiceUuids.GenericAccess);

            // 获取Gatt特征
            GattCharacteristicsResult characteristicsResult = await service.GetCharacteristicsAsync();
            _characteristic = characteristicsResult.Characteristics.FirstOrDefault(c => c.Uuid == GattCharacteristicUuids.DeviceName);

            // 订阅通知
            _characteristic.ValueChanged += Characteristic_ValueChanged;
            GattCommunicationStatus status = await _characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(
                GattClientCharacteristicConfigurationDescriptorValue.Notify);

            if (status == GattCommunicationStatus.Success)
            {
                _receivedData = new List();
            }
        }

        private void Characteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
        {
            byte[] receivedBytes = args.CharacteristicValue.ToArray();
            _receivedData.AddRange(receivedBytes);

            // 判断是否是最后一个数据包
            if (args.CharacteristicValue.ProtectionLevel == GattProtectionLevel.EncryptionRequired &&
                args.CharacteristicValue.SubscribedClientProperties.HasFlag(GattClientCharacteristicConfigurationDescriptorValue.Indicate))
            {
                if (args.CharacteristicValue.SubscribedClientProperties.HasFlag(GattClientCharacteristicConfigurationDescriptorValue.Indicate))
                {
                    // 发送确认回复
                    _characteristic.NotifyValue(args.CharacteristicValue, GattClientCharacteristicConfigurationDescriptorValue.Indicate);
                }
            }
            else
            {
                // 触发数据接收事件
                DataReceived?.Invoke(this, _receivedData.ToArray());
                _receivedData.Clear();
            }
        }
    }
}

这是一个使用C#编写的简单示例，它使用Windows.Devices.Bluetooth和Windows.Devices.Bluetooth.GenericAttributeProfile命名空间中的类来处理BLE数据。在初始化过程中，它连接到BLE设备并订阅通知，然后在特征值更改事件中处理接收到的数据。在判断是否是最后一个数据包时，可以根据特征值的保护级别和已订阅的客户端属性进行判断。如果是最后一个数据包，可以发送确认回复；否则，可以触发数据接收事件并清除接收缓冲区。