Это делает для моей Windows 7:
Загрузите NAudio (http://naudio.codeplex.com/releases/view/79035) и укажите ссылку на DLL в вашем проекте. Затем добавьте следующий код:
try
{
//Instantiate an Enumerator to find audio devices
NAudio.CoreAudioApi.MMDeviceEnumerator MMDE = new NAudio.CoreAudioApi.MMDeviceEnumerator();
//Get all the devices, no matter what condition or status
NAudio.CoreAudioApi.MMDeviceCollection DevCol = MMDE.EnumerateAudioEndPoints(NAudio.CoreAudioApi.DataFlow.All, NAudio.CoreAudioApi.DeviceState.All);
//Loop through all devices
foreach (NAudio.CoreAudioApi.MMDevice dev in DevCol)
{
try
{
//Set at maximum volume
dev.AudioEndpointVolume.MasterVolumeLevel = 0;
//Get its audio volume
System.Diagnostics.Debug.Print("Volume of " + dev.FriendlyName + " is " + dev.AudioEndpointVolume.MasterVolumeLevel.ToString());
//Mute it
dev.AudioEndpointVolume.Mute = true;
System.Diagnostics.Debug.Print(dev.FriendlyName + " is muted");
}
catch (Exception ex)
{
//Do something with exception when an audio endpoint could not be muted
System.Diagnostics.Debug.Print(dev.FriendlyName + " could not be muted");
}
}
}
catch (Exception ex)
{
//When something happend that prevent us to iterate through the devices
System.Diagnostics.Debug.Print("Could not enumerate devices due to an excepion: " + ex.Message);
}