//分组去重

Tag_data = Tag_data.GroupBy(p => p.epc).Select(g => g.First()).OrderBy(o=>o.epc).ToList();    

//去除字符串的空格

string trim = Regex.Replace(epc.epc, @"\s", "");

　　　　　　　　　　//datagridviews手动添加行

　　　　　　　　　 DataGridViewRow row = new DataGridViewRow();
                                DataGridViewTextBoxCell textboxcell = new DataGridViewTextBoxCell();        
                                textboxcell.Value = trim;                                     
                                row.Cells.Add(textboxcell);
                                //下拉框
                                //DataGridViewComboBoxCell comboxcell = new DataGridViewComboBoxCell();
                                //row.Cells.Add(comboxcell);
                                // dgvScanChip.Rows.Add(row);

　　　　　　　　　　//向主线程中操作
                                ControlInvoker.Invoke(this, delegate
                                {
                                    //dgvScanChip.Rows.Add(row);
                                    dgvScanChip.Rows.Insert(0, row);
                                    dgvScanChip.Rows[0].Selected = true;
                                    //居中显示
                                    DataGridViewCellStyle dataGridViewCellStyle1 = new System.Windows.Forms.DataGridViewCellStyle();
                                    dataGridViewCellStyle1.Alignment = DataGridViewContentAlignment.MiddleCenter;
                                    dgvScanChip.DefaultCellStyle = dataGridViewCellStyle1;
                                   
                                });
                                
//读取配置文件

 <appSettings>
    <!-- 系统的com串口配置项 -->
    <add key="School" value="1" />
 
  </appSettings>

private static int chool_id =Convert.ToInt32( ConfigUtil.GetAppConfig("School"))

//清除datagridview

dgvScanChip.Rows.Clear();

dgvScanChip.SelectedRows[0].Cells[0].Value?.ToString()//可为空

dgvScanChip.Rows.Remove(dgvScanChip.SelectedRows[0]);

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