/// <summary>
/// 数据表名称标题发生改变时触发的事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Lbl_dbname_TextChanged(object sender, EventArgs e)
{
//获得数据表名称
string shtname = lbl_dbname.Text;
Setting._currentdb = shtname;
//获得该表下数据datatable
string str_sql = $"select * from {shtname}";
mycontroller.SelectDB("default");
DataTable mydt = mycontroller.GetDataFromTable(str_sql);
lbl_shuliang.Text = $"（{mydt.Rows.Count} 条）";
//将数据绑定到dgv_data
CommonMethod.AddXuhao(mydt);
dgv_data.DataSource = null;
dgv_data.DataSource = mydt;
}