使用EPPLUS操作EXcel

1 下载Epplus最新版：http://epplus.codeplex.com/

2 在项目中添加引用 EEPULS.dll（测试环境Win7+V2010旗舰）

3 添加using引用

　　using OfficeOpenXml;
　　using OfficeOpenXml.Drawing;
　　using OfficeOpenXml.Drawing.Chart;
　　using OfficeOpenXml.Style;

4 read Excel文件

readExcel文件到Datatable

        private void button2_Click(object sender, EventArgs e)
        {
            string pfilePath = "";
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "*.xls|*.xlsx";
            if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                pfilePath = ofd.FileName;
            }
            if (string.IsNullOrEmpty(pfilePath))
            {
                MessageBox.Show("没有选中文件");
                return;
            }

            FileInfo existingFile = new FileInfo(pfilePath);
            try
            {
                ExcelPackage package = new ExcelPackage(existingFile);
                int vSheetCount = package.Workbook.Worksheets.Count; //获取总Sheet页

                ExcelWorksheet worksheet = package.Workbook.Worksheets[1];//选定 指定页

                int maxColumnNum = worksheet.Dimension.End.Column;//最大列
                int minColumnNum = worksheet.Dimension.Start.Column;//最小列

                int maxRowNum = worksheet.Dimension.End.Row;//最小行
                int minRowNum = worksheet.Dimension.Start.Row;//最大行

                DataTable vTable = new DataTable();
                DataColumn vC;
                for (int j = 1; j <= maxColumnNum; j++)
                {
                    vC = new DataColumn("A_" + j, typeof(string));
                    vTable.Columns.Add(vC);
                }
                if (maxRowNum > 200)
                {
                    maxRowNum = 200;
                }
                for (int n = 1; n <= maxRowNum; n++)
                {
                    DataRow vRow = vTable.NewRow();
                    for (int m = 1; m <= maxColumnNum; m++)
                    {
                        vRow[m - 1] = worksheet.Cells[n, m].Value;
                    }
                    vTable.Rows.Add(vRow);
                }
                this.dataGridView1.DataSource = vTable;
            }
            catch (Exception vErr)
            {
                MessageBox.Show(vErr.Message);
            }
        }

5 write Excel文件

5.1 直接生成EXcel示例

private void button1_Click(object sender, EventArgs e)
{
          
    OfficeOpenXml.ExcelPackage ep = new OfficeOpenXml.ExcelPackage();
    OfficeOpenXml.ExcelWorkbook wb = ep.Workbook;
    OfficeOpenXml.ExcelWorksheet ws = wb.Worksheets.Add("我的工作表");
    //配置文件属性 
    wb.Properties.Category = "类别";
    wb.Properties.Author = "作者";
    wb.Properties.Comments = "备注";
    wb.Properties.Company = "公司";
    wb.Properties.Keywords = "关键字";
    wb.Properties.Manager = "管理者";
    wb.Properties.Status = "内容状态";
    wb.Properties.Subject = "主题";
    wb.Properties.Title = "标题";
    wb.Properties.LastModifiedBy = "最后一次保存者";
    //写数据 
    ws.Cells[1, 1].Value = "Hello";
 
    ws.Column(1).Width=40;//修改列宽 
    ws.Cells["B1"].Value = "World";
    ws.Cells[3, 3, 3, 5].Merge = true;
    ws.Cells[3, 3].Value = "Cells[3, 3, 3, 5]合并";
    ws.Cells["A4:D5"].Merge = true;
    ws.Cells["A4"].Value = "Cells["A4:D5"]合并";
 
    SaveFileDialog sfd = new SaveFileDialog();
    sfd.Filter = "*.xls|*.xlsx";
    if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
    {
        FileInfo file = new FileInfo(sfd.FileName);
        ep.File = file;
        ep.Save();
        MessageBox.Show("保存成功");
    }
    else
    {
        MessageBox.Show("取消保存");
    }
}

5.2 从DataGridView导出至Excel

将DataGridView显示内容导出至Excel（DataTable只需小改动即可）

            OfficeOpenXml.ExcelPackage ep = new OfficeOpenXml.ExcelPackage();
            OfficeOpenXml.ExcelWorkbook wb = ep.Workbook;
            OfficeOpenXml.ExcelWorksheet ws = wb.Worksheets.Add("我的工作表");
            //配置文件属性，可以不注释掉  
            //wb.Properties.Category = "类别";
            //wb.Properties.Author = "作者";
            //wb.Properties.Comments = "备注";
            //wb.Properties.Company = "公司";
            //wb.Properties.Keywords = "关键字";
            //wb.Properties.Manager = "管理者";
            //wb.Properties.Status = "内容状态";
            //wb.Properties.Subject = "主题";
            //wb.Properties.Title = "标题";
            //wb.Properties.LastModifiedBy = "最后一次保存者";

            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                for (int j = 1; j < dataGridView1.Columns.Count; j++)
                {
                    if (dataGridView1.Columns[j-1].Visible == true)
                    {
                        if (dataGridView1.Rows[i].Cells[j-1].Value == null)
                        {
                            ws.Cells[i+1, j].Value = " ";
                        }
                        else
                        {
                            string rowstr = dataGridView1.Rows[i].Cells[j-1].Value.ToString();
                            if (rowstr.IndexOf("
") > 0)
                                rowstr = rowstr.Replace("
", " ");
                            if (rowstr.IndexOf("	") > 0)
                                rowstr = rowstr.Replace("	", " ");
                            ws.Cells[i+1, j].Value = rowstr;
                        }
                    }
                }
            } 

            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "*.xls|*.xlsx";
            if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                FileInfo file = new FileInfo(sfd.FileName);
                ep.File = file;
                ep.Save();
                MessageBox.Show("保存成功");
            }
            else
            {
                MessageBox.Show("取消保存");
            }

/// <summary>
        /// 读取sheet 内的数据进入实体
        /// </summary>
        /// <param name="worksheet"></param>
        /// <returns></returns>
        public List<Person> GetSheetValues(string filepath)
        {
            FileInfo file = new FileInfo(filepath);
            if (file != null)
            {
                using (ExcelPackage package = new ExcelPackage(file))
                {

                    ExcelWorksheet worksheet = package.Workbook.Worksheets[0];
                    //获取表格的列数和行数
                    int rowCount = worksheet.Dimension.Rows;
                    int ColCount = worksheet.Dimension.Columns;
                    var persons = new List<Person>();
                    for (int row = 1; row <= rowCount; row++)
                    {
                        Person person = new Person();
                        person.Name = worksheet.Cells[row, 1].Value.ToString();
                        person.Sex = worksheet.Cells[row, 2].Value.ToString();
                        persons.Add(person);
                    }
                    return persons;
                }
            }
             return null;
        }

上述代码大部分来源网络，只进行过小改动，下面是原文和资料地址：

http://blog.csdn.net/jimmy2248/article/details/8363697

http://blog.csdn.net/zhoufoxcn/article/details/14112473

http://www.cnblogs.com/liudeyun/p/3535740.html

http://blog.163.com/china__xuhua/blog/static/19972316920136335721285/

http://www.cnblogs.com/xiaotan68/archive/2008/03/20/1114796.html