複製從「源代碼目錄」獨立存儲

Question

我已經創造了一些SQLite數據庫，並把它在我的項目內容，文件在這個地方

我怎樣才能第一時間檢查用戶安裝應用程序並將這2個數據庫複製到獨立存儲？

---

我已經試過這種方式，但它給了我一個錯誤"Object reference not set to an instance of an object."在行

using (Stream stream = Application.GetResourceStream(new Uri("/Assets/DBS/MyPlaylist.db", UriKind.Relative)).Stream) 

這裏是我的代碼

private static string DataFolder = "Datas";  
public static void FirstTimeCopyDB() 
    { 
     using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication()) 
     { 
      if (!isf.DirectoryExists(DataFolder)) 
      { 
       isf.CreateDirectory(DataFolder); 
       using (Stream stream = Application.GetResourceStream(new Uri("/Assets/DBS/MyPlaylist.db", UriKind.Relative)).Stream) 
       { 
        using (IsolatedStorageFileStream isfs = isf.CreateFile("Datas/MyPlaylist.db")) 
        { 
         byte[] buffer = new byte[1024]; 
         int byteRead = -1; 
         while ((byteRead = stream.Read(buffer, 0, buffer.Length)) > 0) 
         { 
          isfs.Write(buffer, 0, byteRead); 
         } 
        } 
       } 
       using (Stream stream = Application.GetResourceStream(new Uri("/Assets/DBS/MyDatabase.db",UriKind.Relative)).Stream) 
       { 
        using (IsolatedStorageFileStream isfs = isf.CreateFile("Datas/MyDatabase.db")) 
        { 
         byte[] buffer = new byte[1024]; 
         int byteRead = -1; 
         while ((byteRead = stream.Read(buffer,0,buffer.Length))>0) 
         { 
          isfs.Write(buffer,0,byteRead); 
         } 
        } 
       } 
      } 
      else return; 
     } 
    } 

Answer 1

事情是這樣的：

using (var store = IsolatedStorageFile.GetUserStoreForApplication()) 
{ 
    if (!store.FileExists("yourDBfileName")) 
    { 
    // copy yourDBfile 
    } 
} 

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