How to read an audio file from IsolatedStorage?

问题:

I have an audio file stored in IsolatedStorage..

I want to access it by calling a method of another class:

using (IsolatedStorageFile isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
    using (IsolatedStorageFileStream fileStream = isolatedStorage.OpenFile(filePath, FileMode.Open, FileAccess.Read))
    {

        return fileStream;
    }
}

now when I call that method this way:

var fileStream = Musics.TryGetMusic("DaDaDa.mp3");
musicMediaElement.SetSource(fileStream);
musicMediaElement.Play();

I get an error saying it cannot read a closed file.

The cause is that I'm using using statement and the file is closed when I call Play(). How can I solve this problem?

回答1:

It's because, I presume yo call it, like

.... 

 using (IsolatedStorageFileStream fileStream = isolatedStorage.OpenFile(filePath, FileMode.Open, FileAccess.Read))
 {    
     return fileStream;
 }
....

After exiting from the using statement, fileStream instance will be disposed.

To resolve this issue should be enough to not use using here,but instead track that instance lifetime and call dispose manually in appropriate place.