獨立存儲不工作在Windows Phone應用程序

我有這樣的獨立存儲功能寫入到存儲：獨立存儲不工作在Windows Phone應用程序

public static void WriteIsolatedStorage(object ObjectToStore, StorageType Key) 
{ 

    using (var storage = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication()) 
    using (var storageFile = storage.CreateFile(Key.ToString())) 
    { 
     var xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(string)); 
     switch (Key) 
     { 
      case StorageType.UserCredentials: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFUserCredentials)); 
       break; 
      case StorageType.BackgroundAgentUserCredentials: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFUserCredentials)); 
       break; 
      case StorageType.UserProfile: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFUser)); 
       break; 
      case StorageType.InboxItems: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(ObservableCollection<dmWFInboxItem>)); 
       break; 
      case StorageType.InboxTileItems: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(ObservableCollection<dmInboxTileInfo>)); 
       break; 
      case StorageType.DocumentHeaders: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(ObservableCollection<dmWFDocumentHeader>)); 
       break; 
      case StorageType.SearchCache: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(List<List<dmWFDocumentHeader>>)); 
       break; 
      case StorageType.FacebookProfile: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmFBUserProfile)); 
       break; 
      case 
       StorageType.BaseUrl: 
       xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFURLSetting)); 
       break; 
      default: 
       break; 
     } 
     xmlSerializer.Serialize(storageFile, ObjectToStore); 
    } 

}

然後這裏是我的功能，從這個存儲獲得：

public static dmWFURLSetting GetBaseUrl(StorageType Key) 
{ 
    try 

    { 

     using (var storage = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication()) 
     { 
      using (var storageFile = storage.OpenFile(Key.ToString(), System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite)) 
      { 
       dmWFURLSetting result = new dmWFURLSetting(); 
       var xmlSerializer = new System.Xml.Serialization.XmlSerializer(typeof(dmWFURLSetting)); 
       return (dmWFURLSetting)xmlSerializer.Deserialize(storageFile); 
      } 
     } 

    } 
    catch (Exception) 
    { 
     return null; 
    } 

}

很好，而且那麼這裏是我如何從m前端調用這些方法，然後viemodel，我正在使用mvvm fr這款手機應用程序。前端電話：

public string URL = (WorkflowBase.BaseURL != null ? WorkflowBase.BaseURL.ToString() : "");

這裏是在後端的公共財產：

public static string BaseURL = AccTech.WP8.Helpers.IsolatedStorage.GetBaseUrl(Helpers.IsolatedStorage.StorageType.BaseUrl).BaseUrl.ToString();

好了，所以來這裏的怪異的一部分，我知道當我開始完全關閉獨立存儲後的仿真器（緩存）是完全乾淨的，所以如果這個函數被調用，我會得到一個空的回報......你可以看到在我的前端叫我做了一個內聯，如果，如果我得到一個空值，則使其「」。所以這裏是我運行時得到的錯誤。 PS：如果我做URL靜態應用程序的工作原理 enter image description here