我正在尝试在点击按钮时播放mp3文件,我正在尝试使用他所做的功能:How can I play mp3 files stored in my Windows Phone 8.1 solution? 但它说效果不好,它说
choise.type_value
代码:
Error 1 The 'await' operator can only be used within an async method. Consider marking this method with the 'async' modifier and changing its return type to 'Task'. c:\users\halt\documents\visual studio 2013\Projects\HDCAR\HDCAR\MainPage.xaml.cs 55 35 HDCAR
答案 0 :(得分:3)
您需要将其设为async void
方法:
async void Alfa4c_Click(object sender, RoutedEventArgs e)
{
// Your code...
这允许您在方法中使用await
。
请注意,您可能还需要正确处理您的信息流。这需要一些额外的工作:
using(var stream = await audioFile.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
// play dat funky music
MediaElement mediaplayer = new MediaElement();
mediaplayer.SetSource(stream, audioFile.ContentType);
var tcs = new TaskCompletionSource<bool>();
mediaplayer.CurrentStateChanged += (o,e) =>
{
if (mediaplayer.CurrentState != MediaElementState.Opening &&
mediaplayer.CurrentState != MediaElementState.Playing &&
mediaplayer.CurrentState != MediaElementState.Buffering &&
mediaplayer.CurrentState != MediaElementState.AcquiringLicense)
{
// Any other state should mean we're done playing
tcs.TrySetResult(true);
}
};
mediaplayer.Play();
await tcs.Task; // Asynchronously wait for media to finish
}
}