/// <summary>
/// 记录查询=>查询按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button3_Click(object sender, EventArgs e)
{
var data = _cos.JlCx(txtKey2.Text);
var datainfo = _cos.Str2JlList(data);
dataGridView2.DataSource = datainfo;
}