独立存储不工作在Windows Phone应用程序

我有这样的独立存储功能写入到存储：独立存储不工作在Windows Phone应用程序

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); 
    } 

}

然后这里是我的功能，从这个存储获得：

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，而且那么这里是我如何从m前端调用这些方法，然后viemodel，我正在使用mvvm fr这款手机应用程序。前端电话：

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

这里是在后端的公共财产：

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

好了，所以来这里的怪异的一部分，我知道当我开始完全关闭独立存储后的仿真器（缓存）是完全干净的，所以如果这个函数被调用，我会得到一个空的回报......你可以看到在我的前端叫我做了一个内联，如果，如果我得到一个空值，则使其“”。所以这里是我运行时得到的错误。 PS：如果我做URL静态应用程序的工作原理 enter image description here