C# 如何获取excel文件中的数据（使用NPOI）

我做这个功能是为了在发送电子邮件时嵌入数据。所以我可以在邮件正文中调用这个函数

private static string getHTML(DataTable dt)
{
    StringBuilder myBuilder = new StringBuilder();

    myBuilder.AppendLine("see attached for the updated list.");
    myBuilder.AppendLine("");

    myBuilder.Append("<table border='1px' cellpadding='5' cellspacing='0' ");
    myBuilder.Append("style='border: solid 1px Silver; font-size: x-small;'>");

    myBuilder.Append("<tr align='left' valign='top'>");


    foreach (DataColumn myColumn in dt.Columns)
    {
        myBuilder.Append("<td align='left' valign='top'>");
        myBuilder.Append(myColumn.ColumnName);
        myBuilder.Append("</td>");
    }

    myBuilder.Append("</tr>");

    int a = 1;

    foreach (DataRow myRow in dt.Rows)
    {
        myBuilder.Append("<tr align='left' valign='top'>");

        foreach (DataColumn myColumn in dt.Columns)
        {
            myBuilder.Append("<td align='left' valign='top'>");
            myBuilder.Append(myRow[myColumn.ColumnName].ToString());
            myBuilder.Append("</td>");
        }

        myBuilder.Append("</tr>");
        a++;

        if (a > 4)
            break;
    }

    myBuilder.Append("</table>");

    return myBuilder.ToString();
}

这是发送电子邮件的代码：

private void email()
{
    // [...]        

    using (var ms = new MemoryStream())
    {
        workbook.Write(ms);
        ms.Position = 0;

        using (MailMessage mm = new MailMessage())
        {
            mm.From = new MailAddress("abcd@gmail.com");
            mm.Bcc.Add("abcd@gmail.com");

            SmtpClient smtp = new SmtpClient();
            mm.Subject = "Task List";

            StringBuilder sb = new StringBuilder();
            mm.Body = getHTML(data);
            mm.Attachments.Add(new Attachment(ms, "Task.xls", "application/vnd.ms-excel"));
            mm.IsBodyHtml = true;
            smtp.Host = "smtp.gmail.com";
            smtp.EnableSsl = true;
            System.Net.NetworkCredential credentials = new System.Net.NetworkCredential();
            credentials.UserName = "abc@gmail.com";
            credentials.Password = "1234";
            smtp.UseDefaultCredentials = true;
            smtp.Credentials = credentials;
            smtp.Port = 587;
            smtp.Send(mm);
        }
    }
}

workbook.RemoveSheetAt(0);
}

---

我认为最好的选择是将工作簿对象转换为html。您可以看到转换的预期结果。您可以转换工作簿的内容并将其嵌入电子邮件，如下所示：

private string ConvertXlsToHtml(IWorkbook workbook)
{
    ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter();

    // Set output parameters 
    excelToHtmlConverter.OutputColumnHeaders = false;
    excelToHtmlConverter.OutputHiddenColumns = true;
    excelToHtmlConverter.OutputHiddenRows = true;
    excelToHtmlConverter.OutputLeadingSpacesAsNonBreaking = false;
    excelToHtmlConverter.OutputRowNumbers = true;
    excelToHtmlConverter.UseDivsToSpan = true;

    // Process the Excel file 
    excelToHtmlConverter.ProcessWorkbook(workbook);

    return excelToHtmlConverter.Document.ToString();
}

....

using (var ms = new MemoryStream())
{
    workbook.Write(ms);
    ms.Position = 0;

    string mailBody = getHTML(data) + ConvertXlsToHtml(workbook);

    using (MailMessage mm = new MailMessage())
    {
        mm.From = new MailAddress("abcd@gmail.com");

        mm.Bcc.Add("abcd@gmail.com");

        SmtpClient smtp = new SmtpClient();
        mm.Subject = "Task List";

        StringBuilder sb = new StringBuilder();
        mm.Body = mailBody;
        mm.Attachments.Add(new Attachment(ms, "Task.xls", "application/vnd.ms-excel"));
        mm.IsBodyHtml = true;
        smtp.Host = "smtp.gmail.com";
        smtp.EnableSsl = true;
        System.Net.NetworkCredential credentials = new System.Net.NetworkCredential();
        credentials.UserName = "abc@gmail.com";
        credentials.Password = "1234";
        smtp.UseDefaultCredentials = true;
        smtp.Credentials = credentials;
        smtp.Port = 587;
        smtp.Send(mm);

    }
}

---

@安娜·卡罗莱纳·曼赞（Ana Carolina Manzan）非常接近于提供一个有效的解决方案。您必须将Excel工作簿转换为HTML，以便将数据嵌入电子邮件中

我所做的：

• 使用一些数据和样式创建工作簿：

  CreateWorkbook

• 将工作簿转换为HTML:

  ConvertExcelToHTML

• 获取一个带有标记

  {excel}

  的HTML表，以在特定位置显示嵌入的工作簿：

  GetHTML

• 用HTML工作簿替换

  {excel}

  发送邮件

参考文献：

---

请尝试以下工作代码（已测试）：

使用：

using NPOI.HSSF.UserModel;
using NPOI.SS.Converter;
using System.IO;
using System.Net;
using System.Net.Mail;

主要代码：

HSSFWorkbook workbook = CreateWorkbook();

string excelEmbedded = string.Empty;

using (MemoryStream ms = new MemoryStream())
{
    workbook.Write(ms);
    ms.Position = 0;

    excelEmbedded = ConvertExcelToHTML(workbook);
}

using (MailMessage message = new MailMessage())
{
    message.Body = GetHTML().Replace("{excel}", excelEmbedded);
    message.Subject = "Embedded Excel";
    message.From = new MailAddress("abcd@gmail.com");
    message.To.Add("abc@gmail.com");
    message.IsBodyHtml = true;

    using (SmtpClient client = new SmtpClient())
    {
        NetworkCredential credentials = new NetworkCredential();
        credentials.UserName = "abc@gmail.com";
        credentials.Password = "1234";

        client.Host = "smtp.gmail.com";
        client.UseDefaultCredentials = true;
        client.Credentials = credentials;
        client.Port = 587;

        client.Send(message);
    }
}

方法

private HSSFWorkbook createWorkbook()
{
    HSSFWorkbook workbook = new HSSFWorkbook();

    HSSFSheet sheet1 = (HSSFSheet)workbook.CreateSheet("Sheet 1");

    HSSFCellStyle style1 = (HSSFCellStyle)workbook.CreateCellStyle();
    style1.BorderLeft = NPOI.SS.UserModel.BorderStyle.Medium;
    style1.BorderRight = NPOI.SS.UserModel.BorderStyle.Medium;
    style1.BorderTop = NPOI.SS.UserModel.BorderStyle.Medium;
    style1.BorderBottom = NPOI.SS.UserModel.BorderStyle.Medium;

    HSSFRow row1 = (HSSFRow)sheet1.CreateRow(0);

    HSSFCell cell1 = (HSSFCell)row1.CreateCell(0);
    cell1.SetCellValue("Header 1");
    cell1.CellStyle = style1;

    HSSFCell cell2 = (HSSFCell)row1.CreateCell(1);
    cell2.SetCellValue("Header 2");
    cell2.CellStyle = style1;

    HSSFCell cell3 = (HSSFCell)row1.CreateCell(2);
    cell3.SetCellValue("Header 3");
    cell3.CellStyle = style1;

    HSSFRow row2 = (HSSFRow)sheet1.CreateRow(1);
    row2.CreateCell(0).SetCellValue("Data 1");
    row2.CreateCell(1).SetCellValue("Data 2");
    row2.CreateCell(2).SetCellValue("Data 3");

    return workbook;
}

private string ConvertExcelToHTML(HSSFWorkbook workbook)
{
    ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter();

    // Set output parameter
    excelToHtmlConverter.OutputColumnHeaders = false;
    excelToHtmlConverter.OutputHiddenColumns = false;
    excelToHtmlConverter.OutputHiddenRows = true;
    excelToHtmlConverter.OutputLeadingSpacesAsNonBreaking = false;
    excelToHtmlConverter.OutputRowNumbers = true;
    excelToHtmlConverter.UseDivsToSpan = true;

    // Process the Excel file
    excelToHtmlConverter.ProcessWorkbook(workbook);

    // Return the HTML
    return excelToHtmlConverter.Document.InnerXml;
}

private string GetHTML()
{
    StringBuilder myBuilder = new StringBuilder();

    myBuilder.AppendLine("see attached for the updated list.");
    myBuilder.AppendLine("");

    myBuilder.AppendLine("<table style='border:1px solid black'>");
    myBuilder.AppendLine("<tr><td>Cell Text</td></tr>");
    myBuilder.AppendLine("<tr><td>{excel}</td></tr>");
    myBuilder.AppendLine("</table>");

    return myBuilder.ToString();
}

private HSSFWorkbook createWorkbook（）
{
HSSFWorkbook=新的HSSFWorkbook（）；
HSSFSheet sheet1=（HSSFSheet）工作簿。创建工作表（“工作表1”）；
HSSFCellStyle1=（HSSFCellStyle）工作簿。CreateCellStyle（）；
style1.BorderLeft=NPOI.SS.UserModel.BorderStyle.Medium；
style1.BorderRight=NPOI.SS.UserModel.BorderStyle.Medium；
style1.BorderTop=NPOI.SS.UserModel.BorderStyle.Medium；
style1.BorderBottom=NPOI.SS.UserModel.BorderStyle.Medium；
HSSFRow行1=（HSSFRow）表1.创建行（0）；
HSSFCell cell1=（HSSFCell）行1.CreateCell（0）；
cell1.SetCellValue（“标题1”）；
cell1.CellStyle=style1；
HSSFCell cell2=（HSSFCell）行1.CreateCell（1）；
cell2.SetCellValue（“标题2”）；
cell2.CellStyle=style1；
HSSFCell cell3=（HSSFCell）行1.CreateCell（2）；
cell3.SetCellValue（“标题3”）；
cell3.CellStyle=style1；
HSSFRow行2=（HSSFRow）表1.创建行（1）；
行2.CreateCell（0.SetCellValue（“数据1”）；
行2.CreateCell（1.SetCellValue（“数据2”）；
行2.CreateCell（2.SetCellValue（“数据3”）；
返回工作簿；
}
私有字符串转换ExcelToHTML（HSSF工作簿）
{
ExcelToHtmlConverter ExcelToHtmlConverter=新的ExcelToHtmlConverter（）；
//设置输出参数
excelToHtmlConverter.OutputColumnHeaders=false；
excelToHtmlConverter.OutputHiddenColumns=false；
excelToHtmlConverter.OutputHiddenRows=true；
excelToHtmlConverter.OutputLeadingSpacessNonBreaking=false；
excelToHtmlConverter.OutputLownNumber=true；
excelToHtmlConverter.UseDivsToSpan=true；
//处理Excel文件
excelToHtmlConverter.ProcessWorkbook（工作簿）；
//返回HTML
返回excelToHtmlConverter.Document.InnerXml；
}
私有字符串GetHTML（）
{
StringBuilder myBuilder=新建StringBuilder（）；
AppendLine（“更新列表见附件”）；
myBuilder.AppendLine（“”）；
myBuilder.AppendLine（“”）；
myBuilder.AppendLine（“单元格文本”）；
myBuilder.AppendLine（“{excel}”）；
myBuilder.AppendLine（“”）；
返回myBuilder.ToString（）；
}

您要做的是使用DataTable对象中的数据创建一个文件？@Ana Carolina Manzan No.我想在电子邮件中嵌入sheet1数据。我已经使用NPOI创建了一个sheet1 xls文件，数据在我的DataTable对象中。您是否已经使用任何代码尝试发送电子邮件？你能给我看看吗？@Ana Carolina Manzan是的，我添加了发送电子邮件的代码！哦，那不是我的问题！该文件是附加在电子邮件中很好，但我也想嵌入在电子邮件正文的部分数据。这就是我创建函数getHtml（）的原因。我成功地嵌入了dataTable数据，但我无法将sheet1数据嵌入到电子邮件正文中。

private HSSFWorkbook createWorkbook()
{
    HSSFWorkbook workbook = new HSSFWorkbook();

    HSSFSheet sheet1 = (HSSFSheet)workbook.CreateSheet("Sheet 1");

    HSSFCellStyle style1 = (HSSFCellStyle)workbook.CreateCellStyle();
    style1.BorderLeft = NPOI.SS.UserModel.BorderStyle.Medium;
    style1.BorderRight = NPOI.SS.UserModel.BorderStyle.Medium;
    style1.BorderTop = NPOI.SS.UserModel.BorderStyle.Medium;
    style1.BorderBottom = NPOI.SS.UserModel.BorderStyle.Medium;

    HSSFRow row1 = (HSSFRow)sheet1.CreateRow(0);

    HSSFCell cell1 = (HSSFCell)row1.CreateCell(0);
    cell1.SetCellValue("Header 1");
    cell1.CellStyle = style1;

    HSSFCell cell2 = (HSSFCell)row1.CreateCell(1);
    cell2.SetCellValue("Header 2");
    cell2.CellStyle = style1;

    HSSFCell cell3 = (HSSFCell)row1.CreateCell(2);
    cell3.SetCellValue("Header 3");
    cell3.CellStyle = style1;

    HSSFRow row2 = (HSSFRow)sheet1.CreateRow(1);
    row2.CreateCell(0).SetCellValue("Data 1");
    row2.CreateCell(1).SetCellValue("Data 2");
    row2.CreateCell(2).SetCellValue("Data 3");

    return workbook;
}

private string ConvertExcelToHTML(HSSFWorkbook workbook)
{
    ExcelToHtmlConverter excelToHtmlConverter = new ExcelToHtmlConverter();

    // Set output parameter
    excelToHtmlConverter.OutputColumnHeaders = false;
    excelToHtmlConverter.OutputHiddenColumns = false;
    excelToHtmlConverter.OutputHiddenRows = true;
    excelToHtmlConverter.OutputLeadingSpacesAsNonBreaking = false;
    excelToHtmlConverter.OutputRowNumbers = true;
    excelToHtmlConverter.UseDivsToSpan = true;

    // Process the Excel file
    excelToHtmlConverter.ProcessWorkbook(workbook);

    // Return the HTML
    return excelToHtmlConverter.Document.InnerXml;
}

private string GetHTML()
{
    StringBuilder myBuilder = new StringBuilder();

    myBuilder.AppendLine("see attached for the updated list.");
    myBuilder.AppendLine("");

    myBuilder.AppendLine("<table style='border:1px solid black'>");
    myBuilder.AppendLine("<tr><td>Cell Text</td></tr>");
    myBuilder.AppendLine("<tr><td>{excel}</td></tr>");
    myBuilder.AppendLine("</table>");

    return myBuilder.ToString();
}