如何在透視選項發生變化時在圖像中加載圖像後加載音頻文件

Question

最近，我試圖爲windows phone平臺創建名爲「Learn ABCD」的應用程序。

這個應用程序的主要邏輯是，最初我想加載所有的字母字符圖像像蘋果公司的B，球等等圖像的樞軸項目，同時刷每個樞軸項目，將顯示相應的字母圖像和音頻文件比如如果我滑動到B意味着那麼對應的B對於球形圖像和B對講音頻文件應該在後臺播放。

我已成功加載圖像並在使用旋轉控制滑動時播放相應的音頻文件，但問題是音頻文件在圖像顯示給用戶之前播放。我需要的是在圖像後播放音頻文件。

這裏是樞軸控件我加載圖片代碼：

---

XAML代碼

<phone:Pivot x:Name="pivot" ItemsSource="{Binding}" SelectionChanged="pivot_SelectionChanged" > 
    <phone:Pivot.HeaderTemplate> 
     <DataTemplate> 
      <TextBlock Name="HeaderText" Text="" Foreground="White" ></TextBlock> 
     </DataTemplate> 
    </phone:Pivot.HeaderTemplate> 
    <phone:Pivot.ItemTemplate> 
     <DataTemplate> 
      <Grid Margin="0,-50,0,0"> 
       <Image Name="img" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Source="{Binding _images}" /> 
      </Grid> 
     </DataTemplate> 
    </phone:Pivot.ItemTemplate> 
</phone:Pivot> 

---

和我的CS文件

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 LearnABCD.Resources; 
    using System.Windows.Media; 
    using System.Windows.Media.Imaging; 
    using System.Diagnostics; 
    using Microsoft.Xna.Framework.Media; 
    using System.Threading; 

    namespace LearnABCD 
    { 
     public partial class MainPage : PhoneApplicationPage 
     { 

    String[] HeadText = new String[] { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" }; 
    String[] alpha = new String[] { "aa", "bb", "cc", "dd", "ee", "ff", "gg", "hh", "ii", "jj", "kk", "ll", "mm", "nn", "oo", "pp", "qq", "rr", "ss", "tt", "uu", "vv", "ww", "xx", "yy", "zz" }; 
    String[] Galtones1 = { "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "a10", "a11", "a12", "a13", "a14", "a15", "a16", "a17", "a18", "a19", "a20", "a21", "a22", "a23", "a24", "a25" }; 
    String[] Galtones2 = { "aa0", "aa1", "aa2", "aa3", "aa4", "aa5", "aa6", "aa7", "aa8", "aa9", "aa10", "aa11", "aa12", "aa13", "aa14", "aa15", "aa16", "aa17", "aa18", "aa19", "aa20", "aa21", "aa22", "aa23", "aa24", "aa25" }; 
    private List<TList> _pivotList; 
    // Constructor 
    public MainPage() 
    { 
     InitializeComponent(); 
     Loaded += Pivot_Loaded; 
    } 
    private void Pivot_Loaded(object sender, RoutedEventArgs e) 
    { 
     _pivotList = new List<TList>(); 
     for (int i = 0; i < alpha.Length; i++) 
     { 
      _pivotList.Add(new TList 
      { 
       _images = "image/" + alpha[i] + ".png", 
      }); 
     } 
     pivot.DataContext = _pivotList; 
    } 

    private void initialize_audio() 
    { 
     int noteID1 = pivot.SelectedIndex; 
     for (int i = 0; i < 3; i++) 
     { 
      if (i == 0) 
      { 
       Initialize(); 
       Song song = Song.FromUri("Petzold", new Uri("AudioABCD/" + Galtones1[noteID1] + ".mp3", UriKind.Relative)); 
       PlaySong(song); 
      } 
      else if (i == 1) 
      { 
       Initialize(); 
       Song song = Song.FromUri("Petzold", new Uri("image/fr.mp3", UriKind.Relative)); 
       PlaySong(song); 
      } 
      else if (i == 2) 
      { 
       Initialize(); 
       Song song = Song.FromUri("Petzold", new Uri("AudioABCD/" + Galtones2[noteID1] + ".mp3", UriKind.Relative)); 
       PlaySong(song); 
      } 
      Thread.Sleep(1000); 
     } 
    } 

    private void pivot_SelectionChanged(object sender, SelectionChangedEventArgs e) 
    { 
     initialize_audio(); 
    } 

    void Initialize() 
    { 
     MediaPlayer.Stop(); 
    } 

    void PlaySong(Song song) 
    { 
     MediaPlayer.Play(song); 
    }   
} 

class TList 
{ 
    public string _images { get; set; } 
} 

    } 

Answer 1

使用Image「 e。Loaded e發泄你的聲音。 也就是說

<Image Loaded="OnImageLoaded"/> 

然後在你的cs文件：

public void OnImageLoaded(object sender, EventArgs e) 
{ 
    PlaySong(song); 
}