C# Windows11API 实现蓝牙链接通信

要使用C# Windows 11 API实现蓝牙连接通信，可以按照以下步骤进行：

1. 确认蓝牙适配器已经连接到计算机上，并且已经打开。

2. 使用Windows.Devices.Bluetooth命名空间中的BluetoothLEDevice.FromBluetoothAddressAsync方法获取蓝牙设备对象。

3. 使用Windows.Devices.Enumeration命名空间中的DeviceInformation.FindAllAsync方法查找设备服务。

4. 使用Windows.Devices.Bluetooth.GenericAttributeProfile命名空间中的GattDeviceService.GetCharacteristicsAsync方法获取设备特性。

5. 使用Windows.Devices.Bluetooth.GenericAttributeProfile命名空间中的GattCharacteristic.ValueChanged事件处理程序接收设备发送的数据。

6. 使用Windows.Devices.Bluetooth.GenericAttributeProfile命名空间中的GattCharacteristic.WriteValueAsync方法写入数据。

示例代码如下：

using Windows.Devices.Bluetooth;
using Windows.Devices.Enumeration;
using Windows.Devices.Bluetooth.GenericAttributeProfile;
using System;
using System.Threading.Tasks;

namespace BluetoothCommunication
{
    class Program
    {
        private static GattCharacteristic _characteristic;

        static async Task Main(string[] args)
        {
            var deviceSelector = BluetoothLEDevice.GetDeviceSelectorFromConnectionStatus(BluetoothConnectionStatus.Connected);
            var deviceInformationCollection = await DeviceInformation.FindAllAsync(deviceSelector);
            if (deviceInformationCollection.Count > 0)
            {
                var bluetoothLeDevice = await BluetoothLEDevice.FromIdAsync(deviceInformationCollection[0].Id);
                if (bluetoothLeDevice != null)
                {
                    var servicesResult = await bluetoothLeDevice.GetGattServicesAsync();
                    if (servicesResult.Status == GattCommunicationStatus.Success)
                    {
                        foreach (var service in servicesResult.Services)
                        {
                            var characteristicsResult = await service.GetCharacteristicsAsync();
                            if (characteristicsResult.Status == GattCommunicationStatus.Success)
                            {
                                foreach (var characteristic in characteristicsResult.Characteristics)
                                {
                                    if (characteristic.CharacteristicProperties.HasFlag(GattCharacteristicProperties.Write))
                                    {
                                        _characteristic = characteristic;
                                        characteristic.ValueChanged += Characteristic_ValueChanged;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        private static async void Characteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
        {
            var reader = Windows.Storage.Streams.DataReader.FromBuffer(args.CharacteristicValue);
            var data = reader.ReadString(args.CharacteristicValue.Length);
            Console.WriteLine("Received data: " + data);
        }

        private static async Task SendData(string data)
        {
            var writer = new Windows.Storage.Streams.DataWriter();
            writer.WriteString(data);
            var result = await _characteristic.WriteValueAsync(writer.DetachBuffer());
            if (result == GattCommunicationStatus.Success)
            {
                Console.WriteLine("Data written successfully");
            }
        }
    }
}

需要注意的是，要使用Windows 11 API实现蓝牙连接通信需要在Windows 11操作系统中运行，并且需要保证设备支持BLE通信。