IsolatedStorageFile 本地数据缓存 xml dataset 读写

IsolatedStorageFile：包含文件和数据的独立存储区
dataset数据存储到本地xml文档，代码处理如下
public static void WriteDataToXML(DataSet dataset, string dataname)
{
try
{
IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForAssembly(); // 获取与调用代码的程序集标识对应的用户范围的独立存储
string fileName = "";
fileName = dataname.ToUpper() + ".xml";
using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream(fileName, FileMode.Create, isoStore))
{
using (StreamWriter writer = new StreamWriter(isoStream))
{
dataset.WriteXml(writer, XmlWriteMode.WriteSchema);
}
}
}
catch
{ }
} 
相对应的处理方式为：按照给定的文件名称（xml）读取数据到当前的dataset中以备后续的数据操作处理
代码如下：
public static void ReadDatafromXML(DataSet dataset, string dataname)
{
try
{
IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForAssembly();
string fileName = "";
fileName = dataname.ToUpper() + ".xml";
if (IsolatedStorageFile.GetUserStoreForAssembly().GetFileNames(fileName).Length == 0)
{
dataset = null;
}
else
{
using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream(fileName, FileMode.Open, isoStore))
{
using (StreamReader reader = new StreamReader(isoStream))
{
dataset.ReadXml(reader, XmlReadMode.ReadSchema);
}
}
}
}
catch
{ }
}