如何在Windows中通过C#获取已连接蓝牙设备属性？代码运行报错

原代码失效大概率是BluetoothDevice.GetDeviceSelectorFromConnectionStatusAPI在新Windows SDK版本中行为变更，或是权限配置缺失，以下是几种可行的替代方案：

方案一：枚举所有蓝牙设备并筛选已连接状态 #

这种方式兼容性更强，适用于UWP和适配WinRT的桌面应用：

// 获取所有蓝牙设备
var allBluetoothDevices = await DeviceInformation.FindAllAsync(BluetoothDevice.GetDeviceSelector());
var connectedDevices = new List<DeviceInformation>();

foreach (var deviceInfo in allBluetoothDevices)
{
    // 通过设备ID获取蓝牙设备实例
    var bluetoothDevice = await BluetoothDevice.FromIdAsync(deviceInfo.Id);
    if (bluetoothDevice != null && bluetoothDevice.ConnectionStatus == BluetoothConnectionStatus.Connected)
    {
        connectedDevices.Add(deviceInfo);
        // 读取设备属性示例
        string deviceName = deviceInfo.Name;
        string deviceId = deviceInfo.Id;
        bool isPaired = bluetoothDevice.DeviceInformation.Pairing.IsPaired;
    }
}

方案二：添加必要权限配置 #

无论哪种方案，都需要确保应用拥有蓝牙访问权限：

• 若为UWP应用，在Package.appxmanifest中添加蓝牙设备能力：

<Capabilities>
    <DeviceCapability Name="bluetooth"/>
</Capabilities>

• 若为桌面应用（WPF/WinForms），需在系统设置中允许应用访问蓝牙，或在应用清单中声明对应权限。

方案三：使用Win32 Bluetooth API（兼容旧版Windows） #

如果需要兼容更旧的Windows版本，可通过P/Invoke调用原生Win32蓝牙API：

using System.Runtime.InteropServices;
using System;

public static class BluetoothHelper
{
    [StructLayout(LayoutKind.Sequential)]
    private struct SYSTEMTIME
    {
        public ushort wYear;
        public ushort wMonth;
        public ushort wDayOfWeek;
        public ushort wDay;
        public ushort wHour;
        public ushort wMinute;
        public ushort wSecond;
        public ushort wMilliseconds;
    }

    [StructLayout(LayoutKind.Sequential)]
    private struct BLUETOOTH_DEVICE_INFO
    {
        public int dwSize;
        public ulong Address;
        public uint ulClassofDevice;
        public bool fConnected;
        public bool fRemembered;
        public bool fAuthenticated;
        public SYSTEMTIME stLastSeen;
        public SYSTEMTIME stLastUsed;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 248)]
        public string szName;
    }

    [DllImport("BluetoothAPIs.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool BluetoothEnumerateDevices(IntPtr hRadio, ref BLUETOOTH_DEVICE_INFO pDeviceInfo, ref uint pcDevices);

    public static List<string> GetConnectedBluetoothDevices()
    {
        var connectedDevices = new List<string>();
        BLUETOOTH_DEVICE_INFO deviceInfo = new BLUETOOTH_DEVICE_INFO();
        deviceInfo.dwSize = Marshal.SizeOf(deviceInfo);
        uint deviceCount = 0;

        // 先获取设备数量
        BluetoothEnumerateDevices(IntPtr.Zero, ref deviceInfo, ref deviceCount);

        if (deviceCount > 0)
        {
            for (uint i = 0; i < deviceCount; i++)
            {
                if (BluetoothEnumerateDevices(IntPtr.Zero, ref deviceInfo, ref i))
                {
                    if (deviceInfo.fConnected)
                    {
                        connectedDevices.Add(deviceInfo.szName);
                    }
                }
            }
        }

        return connectedDevices;
    }
}

调用方式：

var connectedDeviceNames = BluetoothHelper.GetConnectedBluetoothDevices();

内容的提问来源于stack exchange，提问作者Tom Xue