暂停当前​​歌曲时，Windows Phone应用程序崩溃

Question

当麦克风的振幅超过某个值时，我的目标是暂停当前正在播放的歌曲 但是当振幅增加时，应用程序会突然退出 那是为什么？
如何解决这个问题？

[我做的是我在音乐中播放了一首歌，
 打开此应用程序并按下按钮并发出超过该值的声音 然后app突然退出]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using U.Resources;
using Microsoft.Xna.Framework.Audio;
using System.Windows.Threading;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Media;

namespace U
{
    public partial class MainPage : PhoneApplicationPage
    {
    //global variables
    Microphone microphone = Microphone.Default;
    byte[] buffer;

    // Constructor
    public MainPage()
    {
        InitializeComponent();
        // Timer to simulate the XNA Game Studio game loop (Microphone is from XNA Game Studio)
        DispatcherTimer dt = new DispatcherTimer();
        dt.Interval = TimeSpan.FromMilliseconds(33);
        dt.Tick += delegate { try { FrameworkDispatcher.Update(); } catch { } };
        dt.Start();

        microphone.BufferReady += new EventHandler<EventArgs>(microphone_BufferReady);

    }

    private void buttonStart_Click(object sender, RoutedEventArgs e)
    {
        microphone.BufferDuration = TimeSpan.FromMilliseconds(100);
        buffer = new byte[microphone.GetSampleSizeInBytes(microphone.BufferDuration)];
        microphone.Start();
    }

    void microphone_BufferReady(object sender, EventArgs e)
    {
        microphone.GetData(buffer);
        for (int i = 0; i < buffer.Length; i += 2)
        {
            //The value of sample is the amplitude of the signal
            short sample = BitConverter.ToInt16(new byte[2] { buffer[i], buffer[i + 1] }, 0);
            //getting the absolut value
            if (sample < 0) sample *= (-1);

            //showing the output
             if(sample>1000) pause_music();
        }

    }

    void pause_music() 
    {
        if (MediaPlayer.State == MediaState.Playing)
        {
            FrameworkDispatcher.Update();
            MediaPlayer.Pause();
        }
    }




}

}

Answer 1

它正在崩溃，因为它正在进行StackOverflow！

您不应该在FrameworkDispatcher.Update()方法内拨打pause_music()！ 这只会导致另一次调用microphone_BufferReady然后调用pause_music等等，并且会提供堆栈溢出。

只需删除该行，并记得致电microphone.Stop()，它就能正常工作:)