http://download.csdn.net/detail/tangjingyunshiweifen/8444649
我上传的
代码如下 MMDeviceEnumerator devEnum = new MMDeviceEnumerator();
            defaultDevice =
            devEnum.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia); public void SetVolume(float  scale)
        {
            defaultDevice.AudioEndpointVolume.MasterVolumeLevelScalar=scale;
        }