NPOI利用多任务模式分批写入多个Excel

接上文NPOI大数据分批写入同个Excel，这次是利用task多任务同时写入到多个Excel。

Form2.cs

    private void btnExport_Click(object sender, EventArgs e)
           {
               try
               {
                   txtSql.SafeCall(() =>
                   {
                       txtSql.AppendText("开始处理...\r\n");
                   });  

                   string sqlCount = Sql.GetRecordSql(GetBusinessType(), "");
                   recordCount = db.ExecuteScalar(sqlCount);
                   rowIndex = 0;  

                   string[] sqlWhereArray = Sql.SqlWhereArray;
                   TaskFactory taskFactory = new TaskFactory();
                   Task[] tasks = new Task[sqlWhereArray.Length];
                   for (int k = 0; k < sqlWhereArray.Length; k++)
                   {
                       string sqlWhere = sqlWhereArray[k];
                       int sqlIndex = k;  

                       tasks[sqlIndex] = new Task(Export, sqlIndex);
                       tasks[sqlIndex].Start();
                   }
                   taskFactory.ContinueWhenAll(tasks, TaskEnded, TaskContinuationOptions.None);  

               }
               catch (Exception ex)
               {
                   MessageBox.Show("发生异常，错误提示：" + ex.Message);
               }
           }  

           private void Export(object state)
           {
               BusinessType businessType = GetBusinessType();
               string[] DateRemarkArray = Sql.DateRemarkArray;
               string sql = "";
               string sqlWhere = "";
               int sqlIndex = (int)state;
               DataTable dt = null;
               lock (moniter)
               {
                   sqlIndex = (int)state;
                   sqlWhere = Sql.SqlWhereArray[sqlIndex];
                   sql = Sql.GetDataSql(businessType, sqlWhere);
                   dt = db.GetDataSet(sql).Tables[0];
               }  

               IWorkbook workbook = new XSSFWorkbook();
               ISheet sheet = workbook.CreateSheet();
               txtSql.SafeCall(() =>
               {
                   txtSql.AppendText("条件" + (sqlIndex + 1).ToString() + "：" + DateRemarkArray[sqlIndex] + "\r\n");
               });  

               IRow row0 = sheet.CreateRow(0);
               for (int m = 0; m < dt.Columns.Count; m++)
               {
                   DataColumn dc = dt.Columns[m];
                   row0.CreateCell(m).SetCellValue(dc.ColumnName);
               }  

               for (int i = 0; i < dt.Rows.Count; i++)
               {
                   System.Threading.Interlocked.Increment(ref rowIndex);  

                   DataRow dr = dt.Rows[i];
                   IRow row = sheet.CreateRow(i+1);
                   for (int j = 0; j < dt.Columns.Count; j++)
                   {
                       row.CreateCell(j).SetCellValue(dr[j].ToString());
                   }  

                   Label lbl = GetLabel(sqlIndex + 1);
                   lbl.SafeCall(() =>
                   {
                       if (i == (dt.Rows.Count - 1))
                       {
                           txtSql.AppendText("条件" + (sqlIndex + 1).ToString() + "完成，行数：" + (i + 1).ToString() + "\r\n");
                           lbl.Text = "条件" + (sqlIndex + 1).ToString() + "完成";
                       }
                       else
                       {
                           lbl.Text = string.Format("正在导出第{0}个条件，第{1}行", (sqlIndex + 1).ToString(), (i + 1).ToString());
                       }
                       double x = rowIndex * 1.0 / recordCount * 100;
                       lblProgress.Text = string.Format("总行数：{0}, 当前完成总{1}行，百分占比：{2} %", recordCount.ToString(), rowIndex.ToString(), x.ToString("#0.0"));
                   });
               }
               string fileName = string.Format("{0}_{1}.xlsx", businessType.ToString(), DateRemarkArray[sqlIndex]);
               FileStream outFs = new FileStream(fileName, FileMode.Create);
               workbook.Write(outFs);
               outFs.Close();
           }