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();  
           }