您好，
请问您的APP是什么类型的，windows Silverlight 8.1? windows phone 8.1? Universal Windows 10 App?
这边我先给你一些关于windows 10 app下连接蓝牙的信息供你参考：
windows 10下目前只能连接已经配对好的蓝牙设备，你可以用代码进行配对，具体步骤请参考UWP的官方sample:
https://github.com/Microsoft/Windows-universal-samples/tree/master/Samples/DeviceEnumerationAndPairing
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