/// <summary>
        /// 统计全校学员考试信息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void BtnStart_Click(object sender, EventArgs e)
        {
            this.gbInfo.Text = "全校考试成绩统计";
            var scoreList = scoreListService.QueryStudentScore();

            if (scoreList.Count == 0)
            {
                MessageBox.Show("成绩查询结果为空!", "提示信息");
                return;
            }
            this.dgvScoreList.DataSource = null;
            this.dgvScoreList.DataSource = scoreList;

            //总信息展示
            var scoureInfo = scoreListService.GetScoureInfo();

            this.lblCount.Text       = scoureInfo["absentCount"];
            this.LblCSharpAvg.Text   = scoureInfo["avgCsharp"];
            this.LblDBAvg.Text       = scoureInfo["avgDB"];
            this.lblAttendCount.Text = scoureInfo["stuCount"];

            //缺考人员展示
            var absentStudeltList = scoreListService.GetAbsentStudentName();

            this.lblList.Items.Clear();
            this.lblList.Items.AddRange(absentStudeltList.ToArray());
        }