private void btn_WriteStringToBDB_Click(object sender, RoutedEventArgs e)
        {
            string        guid = this.tbox_Key.Text;
            string        url  = this.tbox_Value.Text;
            DatabaseEntry key  = new DatabaseEntry();

            key.Data = Encoding.ASCII.GetBytes(guid);
            DatabaseEntry value = new DatabaseEntry();

            value.Data = Encoding.ASCII.GetBytes(url);
            bdb.Put(key, value);
            EMessageBox.Show("写入成功");
        }