我需要將哪些屬性保存到RoamingSettings？

Question

我需要將哪些屬性保存到RoamingSettings？

就像我序列化我的數據時，它需要一個DataContract和DataMember屬性。我可以序列我的類XML，但我需要它RoamingSettings保存：

roamingSettings.Values["MyType"] = _mytype; 

調試時，我收到此錯誤信息：

不支持

這種類型的數據。
WinRT的信息：錯誤試圖序列的值寫入到應用數據存儲

我想我需要一個屬性，但哪一個？

Answer 1

處理這種情況的最佳方法是將對象序列化爲字符串並存儲它。

將存儲的字符串值反序列化爲目標對象。

Answer 2

使用正確的StorageFolder ApplicationData.Current.RoamingFolder

public static class RoamingStorage<T> { 

    public static async void SaveData(string filename, T data) 
    { 
     try 
     { 
      StorageFile file = await ApplicationData.Current.RoamingFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting); 
      using (IRandomAccessStream raStream = await file.OpenAsync(FileAccessMode.ReadWrite)) 
      { 
       using (IOutputStream outStream = raStream.GetOutputStreamAt(0)) 
       { 
        DataContractSerializer serializer = new DataContractSerializer(typeof(List<Item>)); 
        serializer.WriteObject(outStream.AsStreamForWrite(), data); 
        await outStream.FlushAsync(); 
       } 
      } 
     } 
     catch (Exception exc) 
     { 
      throw exc; 
     } 
    } 

    public static async System.Threading.Tasks.Task<T> LoadData(string filename) 
    { 
     T data = default(T); 
     try 
     { 
      StorageFile file = await ApplicationData.Current.RoamingFolder.GetFileAsync(filename); 
      using (IInputStream inStream = await file.OpenSequentialReadAsync()) 
      { 
       DataContractSerializer serializer = new DataContractSerializer(typeof(T)); 
       data = (T)serializer.ReadObject(inStream.AsStreamForRead()); 
      } 
     } 
     catch (FileNotFoundException ex) 
     { 
      throw ex; 
     } 
     catch (Exception ex) 
     { 
      throw ex; 
     } 
     return data; 
    } 
} 

例如調用

RoamingStorage<List<Item>>.SaveData(FILENAME,Items); 

List<Item> data = await RoamingStorage<List<Item>>.LoadData(FILENAME);