C# implements hundreds of thousands of levels of data export to Excel and detailed explanation of various Excel operation example codes

This article mainly introduces C# to implement hundreds of thousands of data exports to Excel and various Excel operation examples. The detailed code is compiled here. Friends in need can refer to it.

First export the code

##

  /// <summary> 
      /// 导出速度最快 
      /// </summary> 
      /// <param name="list"><列名，数据></param> 
      /// <param name="filepath"></param> 
      /// <returns></returns> 
      public bool NewExport(List<DictionaryEntry> list, string filepath) 
      { 
        bool bSuccess = true; 
        Microsoft.Office.Interop.Excel.Application appexcel = new Microsoft.Office.Interop.Excel.Application(); 
        System.Reflection.Missing miss = System.Reflection.Missing.Value; 
        appexcel = new Microsoft.Office.Interop.Excel.Application(); 
        Microsoft.Office.Interop.Excel.Workbook workbookdata = null; 
        Microsoft.Office.Interop.Excel.Worksheet worksheetdata = null; 
        Microsoft.Office.Interop.Excel.Range rangedata; 
   
        workbookdata = appexcel.Workbooks.Add(); 
   
        //设置对象不可见 
        appexcel.Visible = false; 
        appexcel.DisplayAlerts = false; 
        try 
        { 
          foreach (var lv in list) 
          { 
            var keys = lv.Key as List<string>; 
            var values = lv.Value as List<IList<object>>; 
            worksheetdata = (Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets.Add(miss, workbookdata.ActiveSheet); 
   
            for (int i = 0; i < keys.Count-1; i++) 
            { 
              //给工作表赋名称 
              worksheetdata.Name = keys[0];//列名的第一个数据位表名 
              worksheetdata.Cells[1, i + 1] = keys[i+1]; 
            } 
   
            //因为第一行已经写了表头，所以所有数据都应该从a2开始 
            rangedata = worksheetdata.get_Range("a2", miss); 
            Microsoft.Office.Interop.Excel.Range xlrang = null; 
   
            //irowcount为实际行数，最大行 
            int irowcount = values.Count; 
            int iparstedrow = 0, icurrsize = 0; 
   
            //ieachsize为每次写行的数值，可以自己设置 
            int ieachsize = 10000; 
   
            //icolumnaccount为实际列数，最大列数 
            int icolumnaccount = keys.Count-1; 
   
            //在内存中声明一个ieachsize×icolumnaccount的数组，ieachsize是每次最大存储的行数，icolumnaccount就是存储的实际列数 
            object[,] objval = new object[ieachsize, icolumnaccount]; 
            icurrsize = ieachsize; 
   
            while (iparstedrow < irowcount) 
            { 
              if ((irowcount - iparstedrow) < ieachsize) 
                icurrsize = irowcount - iparstedrow; 
   
              //用for循环给数组赋值 
              for (int i = 0; i < icurrsize; i++) 
              { 
                for (int j = 0; j < icolumnaccount; j++) 
                { 
                  var v = values[i + iparstedrow][j]; 
                  objval[i, j] = v != null ? v.ToString() : ""; 
                } 
              } 
              string X = "A" + ((int)(iparstedrow + 2)).ToString(); 
              string col = ""; 
              if (icolumnaccount <= 26) 
              { 
                col = ((char)(&#39;A&#39; + icolumnaccount - 1)).ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString(); 
              } 
              else 
              { 
                col = ((char)(&#39;A&#39; + (icolumnaccount / 26 - 1))).ToString() + ((char)(&#39;A&#39; + (icolumnaccount % 26 - 1))).
                ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString(); 
              } 
              xlrang = worksheetdata.get_Range(X, col); 
              xlrang.NumberFormat = "@"; 
              // 调用range的value2属性，把内存中的值赋给excel 
              xlrang.Value2 = objval; 
              iparstedrow = iparstedrow + icurrsize; 
            } 
          } 
          ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet1"]).Delete(); 
          ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet2"]).Delete(); 
          ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet3"]).Delete(); 
          //保存工作表 
          workbookdata.SaveAs(filepath, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss); 
          workbookdata.Close(false, miss, miss); 
          appexcel.Workbooks.Close(); 
          appexcel.Quit(); 
   
          System.Runtime.InteropServices.Marshal.ReleaseComObject(workbookdata); 
          System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel.Workbooks); 
          System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel); 
          GC.Collect(); 
        } 
        catch (Exception ex) 
        { 
          ErrorMsg = ex.Message; 
          bSuccess = false; 
        } 
        finally 
        { 
          if (appexcel != null) 
          { 
            ExcelImportHelper.KillSpecialExcel(appexcel); 
          } 
        } 
        return bSuccess; 
      }

range.NumberFormatLocal = "@";   //设置单元格格式为文本   
  
range = (Range)worksheet.get_Range("A1", "E1");   //获取Excel多个单元格区域：本例做为Excel表头   
  
range.Merge(0);   //单元格合并动作   
  
worksheet.Cells[1, 1] = "Excel单元格赋值";   //Excel单元格赋值   
  
range.Font.Size = 15;   //设置字体大小   
  
range.Font.Underline=true;   //设置字体是否有下划线   
  
range.Font.Name="黑体";    设置字体的种类   
  
range.HorizontalAlignment=XlHAlign.xlHAlignCenter;   //设置字体在单元格内的对其方式   
  
range.ColumnWidth=15;   //设置单元格的宽度   
  
range.Cells.Interior.Color=System.Drawing.Color.FromArgb(255,204,153).ToArgb();   //设置单元格的背景色   
  
range.Borders.LineStyle=1;   //设置单元格边框的粗细   
  
range.BorderAround(XlLineStyle.xlContinuous,XlBorderWeight.xlThick,XlColorIndex.xlColorIndexAutomatic,System.Drawing.Color.Black.ToArgb());   
//给单元格加边框   
  
range.Borders.get_Item(Microsoft.Office.Interop.Excel.XlBordersIndex.xlEdgeTop).LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlLineStyleNone; 
//设置单元格上边框为无边框   
  
range.EntireColumn.AutoFit();   //自动调整列宽   
  
Range.HorizontalAlignment= xlCenter;   // 文本水平居中方式   
  
Range.VerticalAlignment= xlCenter   //文本垂直居中方式   
  
Range.WrapText=true;   //文本自动换行   
  
Range.Interior.ColorIndex=39;   //填充颜色为淡紫色   
  
Range.Font.Color=clBlue;   //字体颜色   
  
xlsApp.DisplayAlerts=false;  //对Excel的操作 不弹出提示信息 
ApplicationClass xlsApp = new ApplicationClass(); // 1. 创建Excel应用程序对象的一个实例，相当于我们从开始菜单打开Excel应用程序。 
if (xlsApp == null) 
{ 
//对此实例进行验证，如果为null则表示运行此代码的机器可能未安装Excel 
}

1. Open the existing Excel file

Workbook workbook = xlsApp.Workbooks.Open(excelFilePath, 
Type.Missing, Type.Missing, Type.Missing, 
Type.Missing, Type.Missing, Type.Missing, Type.Missing, 
Type.Missing, Type.Missing, Type.Missing, Type.Missing, 
Type.Missing, Type.Missing, Type.Missing); 
Worksheet mySheet = workbook.Sheets[1] as Worksheet; //第一个sheet页 
mySheet.Name = "testsheet"; //这里修改sheet名称

2. Copy the sheet Page

mySheet.Copy(Type.Missing, workbook.Sheets[1]);
//复制mySheet成一个新的sheet页，复制完后的名称是mySheet页名称后加一个(2)，这里就是testsheet(2)，复制完后，Worksheet的数量增加一个

Note the two parameters of the Copy method here, which means that the new sheet page to be copied is specified In front or behind the sheet page, the above example means that the copied sheet page is behind the first sheet page.

3. Delete the sheet page

xlsApp.DisplayAlerts = false; //如果想删除某个sheet页，首先要将此项设为fasle。 
(xlsApp.ActiveWorkbook.Sheets[1] as Worksheet).Delete();

4. Select the sheet page

Copy code The code is as follows:

(xlsApp.ActiveWorkbook.Sheets[1] as Worksheet).Select( Type.Missing); //Select a sheet

5. Save the excel file

workbook.Saved = true; 
workbook.SaveCopyAs(filepath);

6. Release excel resources

##

workbook.Close(true, Type.Missing, Type.Missing); 
workbook = null; 
xlsApp.Quit(); 
xlsApp = null;

method 2:

##

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Excel;
using System.Data;

namespace ExcelTest
{
  public class ExcelUtil
  {
    System.Data.DataTable table11 = new System.Data.DataTable();

    public void ExportToExcel(System.Data.DataTable table, string saveFileName)
    {

      bool fileSaved = false;

      //ExcelApp xlApp = new ExcelApp();

      Application xlApp = new Application();

      if (xlApp == null)
      {
        return;
      }

      Workbooks workbooks = xlApp.Workbooks;
      Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet);
      Worksheet worksheet = (Worksheet)workbook.Worksheets[1];//取得sheet1

      long rows = table.Rows.Count;

      /*下边注释的两行代码当数据行数超过行时，出现异常：异常来自HRESULT:0x800A03EC。因为：Excel 2003每个sheet只支持最大行数据

      //Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[table.Rows.Count+2, gridview.Columns.View.VisibleColumns.Count+1]);

      //fchR.Value2 = datas;*/

      if (rows > 65535)
      {

        long pageRows = 60000;//定义每页显示的行数,行数必须小于

        int scount = (int)(rows / pageRows);

        if (scount * pageRows < table.Rows.Count)//当总行数不被pageRows整除时，经过四舍五入可能页数不准
        {
          scount = scount + 1;
        }

        for (int sc = 1; sc <= scount; sc++)
        {
          if (sc > 1)
          {

            object missing = System.Reflection.Missing.Value;

            worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets.Add(

            missing, missing, missing, missing);//添加一个sheet

          }

          else
          {
            worksheet = (Worksheet)workbook.Worksheets[sc];//取得sheet1
          }

          string[,] datas = new string[pageRows + 1, table.Columns.Count+ 1];

for (int i = 0; i < table.Columns.Count; i++) //写入字段
          {
            datas[0, i] = table.Columns[i].Caption;
          }

          Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, table.Columns.Count]);
          range.Interior.ColorIndex = 15;//15代表灰色
          range.Font.Bold = true;
          range.Font.Size = 9;

          int init = int.Parse(((sc - 1) * pageRows).ToString());
          int r = 0;
          int index = 0;
          int result;

          if (pageRows * sc >= table.Rows.Count)
          {
            result = table.Rows.Count;
          }
          else
          {
            result = int.Parse((pageRows * sc).ToString());
          }
          for (r = init; r < result; r++)
          {
            index = index + 1;
            for (int i = 0; i < table.Columns.Count; i++)
            {
              if (table.Columns[i].DataType == typeof(string) || table.Columns[i].DataType == typeof(Decimal) || table.Columns[i].DataType == typeof(DateTime))
              {
                object obj = table.Rows[r][table.Columns[i].ColumnName];
                datas[index, i] = obj == null ? "" : "&#39;" + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式

              }

            }
          }

          Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[index + 2, table.Columns.Count + 1]);

          fchR.Value2 = datas;
          worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。

          range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[index + 1, table.Columns.Count]);

          //15代表灰色

          range.Font.Size = 9;
          range.RowHeight = 14.25;
          range.Borders.LineStyle = 1;
          range.HorizontalAlignment = 1;

        }

      }

      else
      {

        string[,] datas = new string[table.Rows.Count + 2, table.Columns.Count + 1];
        for (int i = 0; i < table.Columns.Count; i++) //写入字段     
        {
          datas[0, i] = table.Columns[i].Caption;
        }

        Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, table.Columns.Count]);
        range.Interior.ColorIndex = 15;//15代表灰色
        range.Font.Bold = true;
        range.Font.Size = 9;

        int r = 0;
        for (r = 0; r < table.Rows.Count; r++)
        {
          for (int i = 0; i < table.Columns.Count; i++)
          {
            if (table.Columns[i].DataType == typeof(string) || table.Columns[i].DataType == typeof(Decimal) || table.Columns[i].DataType == typeof(DateTime))
            {
              object obj = table.Rows[r][table.Columns[i].ColumnName];
              datas[r + 1, i] = obj == null ? "" : "&#39;" + obj.ToString().Trim();//在obj.ToString()前加单引号是为了防止自动转化格式

            }

          }

          //System.Windows.Forms.Application.DoEvents();

}

        Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[table.Rows.Count + 2, table.Columns.Count + 1]);

        fchR.Value2 = datas;
        
        worksheet.Columns.EntireColumn.AutoFit();//列宽自适应。

        range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[table.Rows.Count + 1, table.Columns.Count]);

        //15代表灰色

        range.Font.Size = 9;
        range.RowHeight = 14.25;
        range.Borders.LineStyle = 1;
        range.HorizontalAlignment = 1;
      }

      if (saveFileName != "")
      {
        try
        {
          workbook.Saved = true;
          workbook.SaveCopyAs(saveFileName);
          fileSaved = true;

        }

        catch (Exception ex)
        {
          fileSaved = false;
        }

      }

      else
      {

        fileSaved = false;

      }

      xlApp.Quit();

      GC.Collect();//强行销毁 
  
    }
  }
}

##Method 3:

Go first Official website: http://www.php.cn/ To download, you need to introduce the dll (you can choose .net2.0 or .net4.0 dll), and then add a reference to the website. Export code:

NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("test_01");

// 第一列
NPOI.SS.UserModel.IRow row = sheet.CreateRow(0);
row.CreateCell(0).SetCellValue("第一列第一行");

// 第二列
NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(1);
row2.CreateCell(0).SetCellValue("第二列第一行");

// ...

// 写入到客户端 
System.IO.MemoryStream ms = new System.IO.MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();

Import code:

##

HSSFWorkbook hssfworkbook; 
#region 
public DataTable ImportExcelFile(string filePath) 
{ 
  #region//初始化信息 
  try 
  { 
    using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read)) 
    { 
      hssfworkbook = new HSSFWorkbook(file); 
    } 
  } 
  catch (Exception e) 
  { 
    throw e; 
  } 
  #endregion 
 
  NPOI.SS.UserModel.Sheet sheet = hssfworkbook.GetSheetAt(0); 
  System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); 
  DataTable dt = new DataTable(); 
  for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++) 
  { 
    dt.Columns.Add(Convert.ToChar(((int)&#39;A&#39;) + j).ToString()); 
  } 
  while (rows.MoveNext()) 
  { 
    HSSFRow row = (HSSFRow)rows.Current; 
    DataRow dr = dt.NewRow(); 
    for (int i = 0; i < row.LastCellNum; i++) 
    { 
      NPOI.SS.UserModel.Cell cell = row.GetCell(i); 
      if (cell == null) 
      { 
        dr[i] = null; 
      } 
      else 
      { 
        dr[i] = cell.ToString(); 
      } 
    } 
    dt.Rows.Add(dr); 
  } 
  return dt; 
} 
#endregion

Usage:

First create a blank workbook for testing, create a blank worksheet in it, and create a blank in the table Row, create a cell in the row and fill in the content:

//建立空白工作簿
IWorkbook workbook = new HSSFWorkbook();
//在工作簿中：建立空白工作表
ISheet sheet = workbook.CreateSheet();
//在工作表中：建立行，参数为行号，从0计
IRow row = sheet.CreateRow(0);
//在行中：建立单元格，参数为列号，从0计
ICell cell = row.CreateCell(0);
//设置单元格内容
cell.SetCellValue("实习鉴定表");

Set cell style: Required when setting cell style Note that you must create a new style object for setting, otherwise the styles of all cells in the worksheet will be set together. They should share a style object:

ICellStyle style = workbook.CreateCellStyle();
//设置单元格的样式：水平对齐居中
style.Alignment = HorizontalAlignment.CENTER;
//新建一个字体样式对象
IFont font = workbook.CreateFont();
//设置字体加粗样式
font.Boldweight = short.MaxValue;
//使用SetFont方法将字体样式添加到单元格样式中 
style.SetFont(font);
//将新的样式赋给单元格
cell.CellStyle = style;

Set the cell width and height:

Setting the height of the cell actually sets the height of the row where the cell is located, so it must be in the row where the cell is located. Set the row height on, the row height setting value seems to be 1/20 of the pixel, so *20 to achieve the setting effect;

Setting the width of the cell actually sets the width of the column where it is located, so To set it on the column where the cell is located (the column setting is on the worksheet), the width value seems to be 1/256 of the character, so *256 is used to achieve the setting effect.

//设置单元格的高度
row.Height = 30 * 20;
//设置单元格的宽度
sheet.SetColumnWidth(0, 30 * 256);

Merge cells:

Merge cells actually declare a range and the cells in the range The cells will be merged, and the merged content and style will be based on the cell in the upper left corner of the area.

//设置一个合并单元格区域，使用上下左右定义CellRangeAddress区域
//CellRangeAddress四个参数为：起始行，结束行，起始列，结束列
sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, 10));

Add formula:

Use Cell's CellFormula to set the formula. It is a string. There is no prefix before the formula. Need to add = sign.

//通过Cell的CellFormula向单元格中写入公式
//注：直接写公式内容即可，不需要在最前加'='
ICell cell2 = sheet.CreateRow(1).CreateCell(0);
cell2.CellFormula = "HYPERLINK(\"测试图片.jpg\",\"测试图片.jpg\")";

Write the workbook to a file to view the effect:

//将工作簿写入文件
using (FileStream fs = new FileStream("生成效果.xls", FileMode.Create, FileAccess.Write))
{
 workbook.Write(fs);
}

The above is the detailed explanation of the example code of C# to export hundreds of thousands of data to Excel and various Excel operations. For more related content, please pay attention to the PHP Chinese website (www.php .cn)!