private VirtualizingList <MessageModel> InvokeLoadMsg()
{
var watcher = new Stopwatch();
watcher.Start();
//邮件总数
var count = DbOperator.GetMessageCount(_dbHelper);
//获取邮件
var mailProvider = new MessageProvider(count, 1000)
{
DbHelper = _dbHelper
};
var list = new VirtualizingList <MessageModel>(mailProvider, 100, 1000);
watcher.Stop();
TotalTime = watcher.ElapsedMilliseconds.ToString(CultureInfo.InvariantCulture);
return(list);
}