C# Windows 11 提供的 Bluetooth API实现蓝牙的扫描例程

以下是一个简单的 C# Windows 11 示例代码，演示如何使用 BluetoothLEAdvertisementWatcher 类来扫描周围的蓝牙设备：

using System;
using System.Collections.Generic;
using Windows.Devices.Bluetooth.Advertisement;

class Program
{
    static BluetoothLEAdvertisementWatcher watcher;
    static List<string> discoveredDevices = new List<string>();

    static void Main(string[] args)
    {
        // 创建 BluetoothLEAdvertisementWatcher 并设置扫描参数
        watcher = new BluetoothLEAdvertisementWatcher();
        watcher.ScanningMode = BluetoothLEScanningMode.Active;
        watcher.SignalStrengthFilter.InRangeThresholdInDBm = -70;
        watcher.SignalStrengthFilter.OutOfRangeThresholdInDBm = -75;
        watcher.SignalStrengthFilter.OutOfRangeTimeout = TimeSpan.FromSeconds(2);

        // 添加事件处理程序
        watcher.Received += Watcher_Received;
        watcher.Stopped += Watcher_Stopped;

        // 启动扫描
        watcher.Start();

        Console.WriteLine("Scanning for Bluetooth devices. Press any key to stop.");
        Console.ReadKey();

        // 停止扫描
        watcher.Stop();

        // 输出扫描结果
        Console.WriteLine("Discovered devices:");
        foreach (string device in discoveredDevices)
        {
            Console.WriteLine(device);
        }
    }

    private static void Watcher_Received(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementReceivedEventArgs args)
    {
        string deviceName = args.Advertisement.LocalName;
        string deviceId = args.BluetoothAddress.ToString("X");

        if (!discoveredDevices.Contains(deviceName))
        {
            discoveredDevices.Add(deviceName);
            Console.WriteLine($"Discovered device: {deviceName} ({deviceId})");
        }
    }

    private static void Watcher_Stopped(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementWatcherStoppedEventArgs args)
    {
        Console.WriteLine("Bluetooth LE watcher stopped.");
    }
}

此代码创建一个 BluetoothLEAdvertisementWatcher，设置扫描参数，添加事件处理程序，并启动扫描。当扫描到新设备时，它将输出设备名称和 ID，然后将其添加到 discoveredDevices 列表中。当用户按下任何键时，它将停止扫描并输出已发现的设备列表。