private void btnQuery_Click(object sender, EventArgs e)

{

    // 查询按钮点击后，按钮文本由"查询"改为"加载中",并把按钮状态改为不可点击

    btnQuery.Text = "加载中...";

    btnQuery.Enabled = false;

    // 使用匿名方法定义一个委托事件，委托事件主要操作数据库查询，并返回查询的结果，不涉及任何UI操作

    Func<DataTable> act = () =>

    {

        string sqlstmt = GetQuerySQL();

        DbParams dbpara = new DbParams(DbFactory.Instance.ProviderName);

        dbpara.AddInputDateTime("@beginTime", dtpStart.Value);

        dbpara.AddInputDateTime("@endTime", dtpEnd.Value);

        DataTable dtUserList = DbFactory.Instance.ExecuteDataTable(sqlstmt, dbpara.ToArray());

        return dtUserList;

    };

    // 异步调用委托事件，在委托事件回调方法中，使用任意控件的异步方法把查询结果绑定到数据表控件中

    act.BeginInvoke((result) =>

    {

        DataTable dtResult = act.EndInvoke(result);

        // this是当前WinForm窗口的实例，也可以替换为界面中的任意控件示例，如dgvMain.BeginInvoke

        this.BeginInvoke(new Action<DataTable>((DataTable dtList) =>

        {

            dgvMain.DataSource = dtList;

            btnQuery.Text = "查询(&Q)";

            btnQuery.Enabled = true;

        }), dtResult);

    }, null);

}

this.dgvMain.RowPostPaint += (object sender, DataGridViewRowPostPaintEventArgs e) =>

{

    DataGridView dgv = sender as DataGridView;

    SolidBrush b = new SolidBrush(dgv.RowHeadersDefaultCellStyle.ForeColor);

    e.Graphics.DrawString((e.RowIndex + ).ToString(System.Globalization.CultureInfo.CurrentUICulture), dgv.DefaultCellStyle.Font, b, e.RowBounds.Location.X + , e.RowBounds.Location.Y + );

};