C import Xls data method summary II (save the uploaded file to the DataTable instance object)

C# Import .xls Data method summary II （ Save the uploaded file to DataTable In the instance object ）

Create database instance objects , And create a studentVo Entity class records all uploaded data

// Query out   college , major , grade , class   Information about ： It is used to get the corresponding ID
List<SYS_Academe> dbAcademe = myModel.SYS_Academe.ToList();
List<SYS_Specialty> dbSpecialty = myModel.SYS_Specialty.ToList();
List<SYS_Grade> dbGrade = myModel.SYS_Grade.ToList();
List<SYS_Class> dbClass = myModel.SYS_Class.ToList();

// establish studentVo The object list -》 Used to store imported students / User data 
List<studentVo> listStudentVo = new List<studentVo>();

Get the first payroll . And judge whether there is data in the worksheet, and then carry out the following operations

// Get the first sheet 
ISheet sheet = workbook.GetSheetAt(0);
// Determine whether there is data in the worksheet 
//PhysicalNumberOfRows  Number of physical rows obtained , Not including those empty lines （ Interlace ） The situation of 
if (sheet.PhysicalNumberOfRows > 0){
    
}else{
    
	returnJson.Text = " The worksheet is empty , Please check ！";
}

1、 Create a DataTable Object instances
DataTable() A table representing data in memory

// Load data into datatable in 
//  Definition datatable
DataTable dtExcel = new DataTable();

2、 Get the header information of the uploaded file

The first line is generally the description of the imported data template , It's not header data

// Gets the second row in the worksheet （ The first line is the description , The index for 0）
IRow rowHeader = sheet.GetRow(1);

3、 The basic methods used are as follows

FirstCellNum： Gets the subscript of the first cell in a row
LastCellNum： Get the number of columns in a row
FirstRowNum： Get the subscript of the first actual row
LastRowNum： Get the subscript of the last actual line

4、 Get the number of columns and rows of the uploaded file

The picture above shows 9 Column 3 That's ok

// Get the number of table columns 
int cellCount = rowHeader.LastCellNum;
// Get the number of table rows 
int rowCount = sheet.LastRowNum + 1;

Get the number of lines +1 It means to skip the header data in the second row and start counting

5、 Get the header of the second line of the file circularly and give it to DataTable Set the same header

First get the name of the header column of the uploaded file , Then add the obtained name to DataTable As header
The number of cycles is the number of file columns obtained

// Cycle through the values of each cell in the header row  --  It is equivalent to defining the fields of the database table 
for (var i = rowHeader.FirstCellNum; i < cellCount; i++)
{
    
     // establish dataTable Column in 
     // By traversing each cell in the row , Get the data of each cell in the header row 
     DataColumn dtColumn = new DataColumn(rowHeader.GetCell(i).StringCellValue);
     // Put the data of the obtained Title row into datatable in ;
     dtExcel.Columns.Add(dtColumn);
}

6、 Get the data content of the uploaded file

The number of cycles is ; The number of rows of uploaded data , The description line and header line are not included
Judge that there is one isNull Boolean variables The main function of is to record whether there is empty data in the uploaded file , Empty is true Will not be added to the created DataTable Inside , As a result, a lot of blank data comes out

// Query out   college , major , grade , class   Information about ： It is used to get the corresponding ID
List<SYS_Academe> dbAcademe = myModel.SYS_Academe.ToList();
List<SYS_Specialty> dbSpecialty = myModel.SYS_Specialty.ToList();
List<SYS_Grade> dbGrade = myModel.SYS_Grade.ToList();
List<SYS_Class> dbClass = myModel.SYS_Class.ToList();

// establish studentVo The object list -》 Used to store imported students / User data 
List<studentVo> listStudentVo = new List<studentVo>();

// Get the first sheet 
ISheet sheet = workbook.GetSheetAt(0);
// Determine whether there is data in the worksheet 
//PhysicalNumberOfRows  Number of physical rows obtained , Not including those empty lines （ Interlace ） The situation of 
if (sheet.PhysicalNumberOfRows > 0){
    
// obtain Excel Data rows in the table 
//(sheet.FirstRowNum)  The first line is the description ; The second line is the title ; The third line starts with the data information 
for (var j = sheet.FirstRowNum + 2; j < rowCount; j++)
{
    
    // Get data row （3,4,5,6,......） data 
    IRow row = sheet.GetRow(j);

    // establish DataTable That's ok 
    DataRow dtRow = dtExcel.NewRow();

    if (row != null)
    {
    
       //  De blank line variable 
       bool isNull = true;
      // Traverse all cells in a row , fill dtRow in 
      for (var n = row.FirstCellNum; n < cellCount; n++)
      {
    
          if (row.GetCell(n) != null)
          {
    
               string cellVal = row.GetCell(n).ToString();
               dtRow[n] = cellVal;
               // Go to the airport , If there are non empty cells in the row , Variable isNull by false, Otherwise true
               if (!string.IsNullOrEmpty(cellVal))
               {
    
                    isNull = false;
               }
          }
    	}
        if (!isNull)
        {
    
           // take b Non empty data row dtRow fill dtExcel in 
           dtExcel.Rows.Add(dtRow);
        }
     }
}

7、 Complete will Excel Table data into DataTable In the code

#region  take Excel Table data into DataTable in 

// Load data into datatable in 
//  Definition datatable
DataTable dtExcel = new DataTable();

// Gets the second row in the worksheet （ The first line is the description , The index for 0）
IRow rowHeader = sheet.GetRow(1);

// Get the number of table columns 
int cellCount = rowHeader.LastCellNum;
// Get the number of table rows 
int rowCount = sheet.LastRowNum + 1;

// Cycle through the values of each cell in the header row  --  It is equivalent to defining the fields of the database table 
for (var i = rowHeader.FirstCellNum; i < cellCount; i++)
{
    
         // establish dataTable Column in 
         // By traversing each cell in the row , Get the data of each cell in the header row 
         DataColumn dtColumn = new DataColumn(rowHeader.GetCell(i).StringCellValue);
         // Put the data of the obtained Title row into datatable in ;
         dtExcel.Columns.Add(dtColumn);
}

       // obtain Excel Data rows in the table 
       //(sheet.FirstRowNum)  The first line is the description ; The second line is the title ; The third line starts with the data information 
for (var j = sheet.FirstRowNum + 2; j < rowCount; j++)
{
    
      // Get data row （3,4,5,6,......） data 
      IRow row = sheet.GetRow(j);

      // establish DataTable That's ok 
      DataRow dtRow = dtExcel.NewRow();

     if (row != null)
     {
    
         //  De blank line variable 
         bool isNull = true;
         // Traverse all cells in a row , fill dtRow in 
         for (var n = row.FirstCellNum; n < cellCount; n++)
         {
    
              if (row.GetCell(n) != null)
              {
    
                  string cellVal = row.GetCell(n).ToString();
                  dtRow[n] = cellVal;
                  // Go to the airport , If there are non empty cells in the row , Variable isNull by false, Otherwise true
                  if (!string.IsNullOrEmpty(cellVal))
                  {
    
                       isNull = false;
                  }
              }
          }
          if (!isNull)
          {
    
              // take b Non empty data row dtRow fill dtExcel in 
              dtExcel.Rows.Add(dtRow);
           }
	  }
}
#endregion
}
else {
    
      returnJson.Text = " The worksheet is empty , Please check ！";
}