.Net core using NPOI directly into Excel to a database (Excel that is not saved to the server first and then read the file into the database)

Original: .Net Core using NPOI directly into Excel to a database (Excel that is not saved to the server first and then read the file into the database)

  1         /// <summary>
  2         /// 导入信息
  3         /// </summary>
  4         /// <param name="file"></param>
  5         /// <returns></returns>
  6         /// /Public/PublicPool/ImportCustomer
  7         public ResultData ImportCustomer(IFormFile file)
  8         {
  9             ResultData resultData = new ResultData();
 10             if (file.Length > 0)
 11             {
 12                 DataTable dt = new DataTable();
13 is                  String strMsg;
 14                  // use IFormFile inside OpenReadStream () method to directly read the file stream 
15                  dt = ExcelHelper.ExcelToDatatable (file.OpenReadStream (), Path.GetExtension (file.FileName), OUT strMsg);
 16                  IF (! String .IsNullOrEmpty (strMsg))
 . 17                  {
 18 is                      resultData.Code = - . 1 ;
 . 19                      resultData.Msg = strMsg;
 20 is                      return resultData;
 21 is                  }
 22 is                  IF (dt.Rows.Count> 0 )
 23                 {
 24                 }
 25                 else
 26                 {
 27                     resultData.Code = -1;
 28                     resultData.Msg = "Excel导入表无数据!";
 29                 }
 30             return resultData;
 31         }
 32 
 33 using NPOI.HSSF.UserModel;
 34 using NPOI.SS.UserModel;
 35 using NPOI.XSSF.UserModel;
 36 using System;
 37 using System.Collections.Generic;
 38 using System.Data;
 39 using System.IO;
 40 using System.Text;
 41 
 42 namespace CRM.Common
 43 {
 44     public static class ExcelHelper
 45     {
 46         /// <summary>
 47         /// 将Excel单表转为Datatable
 48         /// </summary>
 49         /// <param name="stream"></param>
 50         /// <param name="fileType"></param>
 51         /// <param name="strMsg"></param>
 52         /// <param name="sheetName"></param>
 53         /// <returns></returns>
 54         public static DataTable ExcelToDatatable(Stream stream, string fileType, out string strMsg, string sheetName = null)
 55         {
 56             strMsg = "";
 57             DataTable dt = new DataTable();
 58             ISheet sheet = null;
 59             IWorkbook workbook = null;
 60              the try 
61 is              {
 62 is                  #region Analyzing excel version
 63                  // 2007+ excel 
64                  IF (fileType == " .xlsx " )
 65                  {
 66                      Workbook new new = (Stream) XSSFWorkbook;
 67                  }
 68                  // 2007 or lower excel 
69                  the else  IF (fileType == " * .xls " )
 70                  {
 71 is                    Workbook = new new HSSFWorkbook (Stream); 72                 }
  
  73                 else
 74                 {
 75                     throw new Exception("传入的不是Excel文件！");
 76                 }
 77                 #endregion
 78                 if (!string.IsNullOrEmpty(sheetName))
 79                 {
 80                     sheet = workbook.GetSheet(sheetName);
 81                     if (sheet == null)
 82                     {
 83                         sheet = workbook.GetSheetAt(0);
 84                     }
 85                 }
 86                 else
 87                 {
 88                     sheet = workbook.GetSheetAt(0);
 89                 }
 90                 if (sheet != null)
 91                 {
 92                     IRow firstRow = sheet.GetRow(0);
 93                     int cellCount = firstRow.LastCellNum;
 94                     for (int i = firstRow.FirstCellNum; i < cellCount; i++)
 95                     {
 96                         ICell cell = firstRow.GetCell(i);
 97                         if (cell != null)
 98                         {
 99                            string cellValue = cell.StringCellValue.Trim();
100                             if (!string.IsNullOrEmpty(cellValue))
101                             {
102                                 DataColumn dataColumn = new DataColumn(cellValue);
103                                 dt.Columns.Add(dataColumn);
104                             }
105                         }
106                     }
107                     DataRow dataRow = null;
108                     //遍历行
109                     for (int j = sheet.FirstRowNum + 1; j <= sheet.LastRowNum; j++)
110                     {
111                         IRow row = sheet.GetRow(j);
112                         dataRow = dt.NewRow();
113                         if (row == null || row.FirstCellNum < 0)
114                         {
115                             continue;
116                         }
 117                          // iterate column 
1 18                          for ( int I = row.FirstCellNum; I <CellCount; I ++ )
 119                          {
 120                              ICell CellData = row.GetCell (I);
 121                              IF (! CellData = null )
 122                              {
 123                                  // determines whether a digital type, the following must be added to the determined date is determined otherwise abnormally 
124                                  iF (cellData.CellType == CellType.Numeric)
 125                                  {
 126                                      // determines whether or not the date type 
127                                      iF (DateUtil.IsCellDateFormatted(cellData))
128                                     {
129                                         dataRow[i] = cellData.DateCellValue;
130                                     }
131                                     else
132                                     {
133                                         dataRow[i] = cellData.ToString().Trim();
134                                     }
135                                 }
136                                 else
137                                 {
138                                     dataRow[i] =cellData.ToString () Trim ();.
 139                                  }
 140                              }
 141 is                          }
 142                          dt.Rows.Add (DataRow);
 143                      }
 144                  }
 145                  the else 
146                  {
 147                      the throw  new new Exception ( " not acquired data tables in Excel! " );
 148                  }
 149              }
 150              the catch (Exception EX)
 151              {
 152                 strMsg = ex.Message;
153             }
154             return dt;
155         }
156     }
157 }

After the Internet to find a lot of methods do not lead directly to save the database, their own research IFormFile class tried it did not expect the unexpected success of the ~~~~~~~~~~