private void Export(object sender, RoutedEventArgs e)
{
exportbtn.IsEnabled = true;
var win = MessageService.GetInstance();
win.ShowMessage("正在导出.....");
var task = Task.Factory.StartNew(() => model.HandleDbToFile());
task.GetAwaiter().OnCompleted(() =>
{
win.CloseMessage();
MessageBox.Show("完成导出");
exportbtn.IsEnabled = true;
});
}