private static void SaveFingerPrint(String destFileName, FingerPrint fingerPrint)
{
String fingerPrintFileName = FileDownloadHelper.MakeFingerPrintFilePath(destFileName);
SecurityElement finger_print = new SecurityElement("finger_print");
finger_print.AddAttribute("time_stamp", fingerPrint.timeStamp);
finger_print.AddAttribute("file_size", fingerPrint.fileSize.ToString());
File.WriteAllText(fingerPrintFileName, finger_print.ToString());
}
private static FingerPrint LoadFingerPrint(String destFileName)
{
String fingerPrintFileName = FileDownloadHelper.MakeFingerPrintFilePath(destFileName);
if (!File.Exists(fingerPrintFileName)) //记录文件尚未创建
{
return new FingerPrint {
timeStamp = "", fileSize = 0
}
}
;
try
{
SecurityElement xmlDoc = SecurityElement.FromString(File.ReadAllText(fingerPrintFileName));
String timeStamp = xmlDoc.Attributes["time_stamp"].ToString();
Int64 fileSize = Int64.Parse(xmlDoc.Attributes["file_size"].ToString());
return(new FingerPrint {
timeStamp = timeStamp, fileSize = fileSize
});
}
catch (IOException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (System.IO.IsolatedStorage.IsolatedStorageException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (XmlSyntaxException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (FormatException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
catch (NullReferenceException)
{
return(new FingerPrint {
timeStamp = "", fileSize = 0
});
}
}
private static void DeleteDestFile(String destFileName)
{
File.Delete(FileDownloadHelper.MakeFingerPrintFilePath(destFileName));
File.Delete(destFileName);
}