前提
你的WM设备必须支持扬声器，模拟器自然不行 首先，需要导入用于发送按键消息的本地函数  class NativeHelper
   {
 private const int KEYEVENTF_KEYUP = 0x0002;
[DllImport("coredll.dll")]
private static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);
  /**//// <summary>
/// 模拟按键触发扬声器
 /// </summary>
public static void TriggleSpeaker()
{
keybd_event((byte)Keys.F16, 0, 0, 0);
Thread.Sleep(500);
keybd_event((byte)Keys.F16, 0, KEYEVENTF_KEYUP, 0);
}
/**//// <summary>
/// 模拟按键接电话
/// </summary>
public static void AcceptCall()
{
keybd_event((byte)Keys.F3, 0, 0, 0);
Thread.Sleep(500);
keybd_event((byte)Keys.F3, 0, KEYEVENTF_KEYUP, 0);
}
 }调用的时候： SystemState phonestate = new SystemState(SystemProperty.PhoneIncomingCall);
phonestate.Changed += new ChangeEventHandler(phonestate_Changed);
void phonestate_Changed(object sender, ChangeEventArgs args)
{
NativeHelper.AcceptCall();
NativeHelper.TriggleSpeaker();
} Enjoy it!
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