如何在Windows Phone 8上打开文件？(How open files on Windows Phone 8?)

在我的应用程序中，我下载了几种文件（如音频，视频，pdf，powerpoint等）。

所以我从webserver收到这些数据作为byte []对象。

所以我想现在用视频播放器或pdfreader打开它们。

我应该做些什么？

我尝试过这段代码，但我想只有当你的项目文件夹中存有一个文件时才会有效（这不是我的情况）......不是吗？

              // Access the file.
              StorageFile pdfFile = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync("FileToRead.pdf");

              // Launch the pdf file.
              await Windows.System.Launcher.LaunchFileAsync(pdfFile);
In my app I download several kinds of files (like audio,video,pdf,powerpoint,ect) .
 
So I receive those data from the webserver as byte[] objects.
 
So I would like to open them with a video player or a pdfreader now.
 
What am I supposed to do?
 
I tried this code but I guess it only works if ou have a file stored in your project's folder(that's not my case)...doesn't it? 
 
              // Access the file.
              StorageFile pdfFile = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFileAsync("FileToRead.pdf");

              // Launch the pdf file.
              await Windows.System.Launcher.LaunchFileAsync(pdfFile);

                
最满意答案
                
                    
                        
 使用此命令从隔离存储中获取文件 
 
var file = await ApplicationData.Current.LocalFolder.GetFileAsync(filename);
Use this to get a file from Isolated Storage
 
var file = await ApplicationData.Current.LocalFolder.GetFileAsync(filename);