private void block_2_MouseDown(object sender, MouseButtonEventArgs e)
{
if (UserLogIn.UserName == "")
{
MessageBox.Show("请先登录系统。若为新用户，请先注册。");
}
else
{
if (e.LeftButton == MouseButtonState.Pressed)
{
if (DocumentEditor_Object == null)
{
DocumentEditor doc = new DocumentEditor();
DocumentEditor_Object = doc;
doc.Show();
}
else
{
DocumentEditor_Object.Activate();
}
}
}
}