我正在将我在 Windows Phone 中发布的应用程序移植到 Win 8。在尝试写入 IsolatedStorage
等效项 ApplicationDataContainer
时,我遇到了异常。异常说
Error : The size of the state manager setting has exceeded the limit
我不确定这是否是使用 ApplicationDataContainer
的正确方法。
public void WriteToIsolatedStorage()
{
try
{
ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
ApplicationDataCompositeValue composite = new ApplicationDataCompositeValue();
if (localSettings.Containers.ContainsKey("LoveCycleSetting"))
{
localSettings.DeleteContainer("LoveCycleSetting");
}
composite["GetWeekStart"] = m_bWeekStart;
composite["iHistCount"] = m_iHistCount;
composite["dtHistory"] = this.DateTimeToString(m_dtHistory);
composite["avgCycleTime"] = m_iAvgCycleTime;
}
}
异常发生在倒数第二行。 m_dtHistory 是一个大小为 400 的字符串数组。那么 ApplicationDataCompositeValue
是否具有固定大小?或者我是否必须将 m_dtHistory 数组写入文件?因为在 WindowsPhone 中我可以直接将数组写入 IsolatedStorageSettings
。
如果有人可以在这方面指导我或提供链接,那将非常有帮助。
阿尔法
最佳答案
是的,具有讽刺意味的是,手机上的设置存储比 WinRT 更容易。您可以只序列化到一个文件。这是我所做的(部分复制自 SuspensionManager.cs
中的代码),它适用于值类型和引用类型。
internal static async Task<bool> SaveSetting(string Key, Object value)
{
var ms = new MemoryStream();
DataContractSerializer serializer = new DataContractSerializer(value.GetType());
serializer.WriteObject(ms, value);
await ms.FlushAsync();
// Uncomment this to preview the contents being written
/*char[] buffer = new char[ms.Length];
ms.Seek(0, SeekOrigin.Begin);
var sr = new StreamReader(ms);
sr.Read(buffer, 0, (int)ms.Length);*/
ms.Seek(0, SeekOrigin.Begin);
StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync(Key, CreationCollisionOption.ReplaceExisting);
using (Stream fileStream = await file.OpenStreamForWriteAsync())
{
await ms.CopyToAsync(fileStream);
await fileStream.FlushAsync();
}
return true;
}
// Necessary to pass back both the result and status from an async function since you can't pass by ref
internal class ReadResults
{
public bool Success { get; set; }
public Object Result { get; set; }
}
internal async static Task<ReadResults> ReadSetting<type>(string Key, Type t)
{
var rr = new ReadResults();
try
{
var ms = new MemoryStream();
DataContractSerializer serializer = new DataContractSerializer(t);
StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync(Key);
using (IInputStream inStream = await file.OpenSequentialReadAsync())
{
rr.Result = (type)serializer.ReadObject(inStream.AsStreamForRead());
}
rr.Success = true;
}
catch (FileNotFoundException)
{
rr.Success = false;
}
return rr;
}
关于c# - ApplicationDataCompositeValue 的大小,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11114912/