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("\r\n") > 0)
rowstr = rowstr.Replace("\r\n", " ");
if (rowstr.IndexOf("\t") > 0)
rowstr = rowstr.Replace("\t", " ");
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");
}

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/