https://www.cnblogs.com/XinruiIIiiiii/p/14308381.html
首先安装NPOI ，点击VS的—>工具—>NuGet包管理器—>管理解决方案的NuGet程序包
导出Excel如下:
/// <summary>
/// 导出Excel
/// </summary>
/// <param name="TableName"></param>
public static void ExportDataToExcel(DataTable TableName)
{
string FileName= DateTime.Now.GetHashCode().ToString();
SaveFileDialog saveFileDialog = new SaveFileDialog();
//设置文件标题
saveFileDialog.Title = "导出Excel文件";
//设置文件类型
saveFileDialog.Filter = "Excel 工作簿(*.xlsx)|*.xlsx|Excel 97-2003 工作簿(*.xls)|*.xls";
//设置默认文件类型显示顺序
saveFileDialog.FilterIndex = 1;
//是否自动在文件名中添加扩展名
saveFileDialog.AddExtension = true;
//是否记忆上次打开的目录
saveFileDialog.RestoreDirectory = true;
//设置默认文件名
saveFileDialog.FileName = FileName;
//按下确定选择的按钮
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
//获得文件路径
string localFilePath = saveFileDialog.FileName.ToString();
//数据初始化
int TotalCount; //总行数
int RowRead = 0; //已读行数
int Percent = 0; //百分比
TotalCount = TableName.Rows.Count;
//NPOI
IWorkbook workbook;
string FileExt = Path.GetExtension(localFilePath).ToLower();
if (FileExt == ".xlsx")
{
workbook = new XSSFWorkbook();
}
else if (FileExt == ".xls")
{
workbook = new HSSFWorkbook();
}
else
{
workbook = null;
}
if (workbook == null)
{
return;
}
ISheet sheet = string.IsNullOrEmpty(FileName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(FileName);
//秒钟
Stopwatch timer = new Stopwatch();
timer.Start();
try
{
//读取标题
IRow rowHeader = sheet.CreateRow(0);
for (int i = 0; i < TableName.Columns.Count; i++)
{
ICell cell = rowHeader.CreateCell(i);
cell.SetCellValue(TableName.Columns[i].ColumnName);
}
//读取数据
for (int i = 0; i < TableName.Rows.Count; i++)
{
IRow rowData = sheet.CreateRow(i + 1);
for (int j = 0; j < TableName.Columns.Count; j++)
{
ICell cell = rowData.CreateCell(j);
cell.SetCellValue(TableName.Rows[i][j].ToString());
}
//状态栏显示
RowRead++;
Percent = (int)(100 * RowRead / TotalCount);
Application.DoEvents();
}
Application.DoEvents();
//转为字节数组
MemoryStream stream = new MemoryStream();
workbook.Write(stream);
var buf = stream.ToArray();
//保存为Excel文件
using (FileStream fs = new FileStream(localFilePath, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
fs.Close();
}
Application.DoEvents();
//关闭秒钟
timer.Reset();
timer.Stop();
//成功提示
if (MessageBox.Show("导出成功，是否立即打开？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
{
System.Diagnostics.Process.Start(localFilePath);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
//关闭秒钟
timer.Reset();
timer.Stop();
}
}
}
/// <summary>
/// 导出Excel模板
/// </summary>
public static void ExportExampleToExcel()
{
DataTable TableName = new DataTable();
TableName.Columns.Add("字段1", typeof(string));
TableName.Columns.Add("字段2", typeof(string));
TableName.Columns.Add("字段3", typeof(string));
TableName.Columns.Add("字段4", typeof(string));
TableName.Columns.Add("字段5", typeof(string));
TableName.Columns.Add("字段6", typeof(string));
TableName.Columns.Add("字段7", typeof(string));
TableName.Columns.Add("字段8", typeof(string));
TableName.Columns.Add("字段9", typeof(string));
TableName.Columns.Add("字段10", typeof(string));
TableName.Columns.Add("字段12", typeof(string));
TableName.Columns.Add("字段13", typeof(string));
TableName.Columns.Add("字段14", typeof(string));
TableName.Columns.Add("字段15", typeof(string));
string FileName = "模板信息导入Excel模板";
SaveFileDialog saveFileDialog = new SaveFileDialog();
//设置文件标题
saveFileDialog.Title = "导出Excel文件";
//设置文件类型
saveFileDialog.Filter = "Excel 工作簿(*.xlsx)|*.xlsx|Excel 97-2003 工作簿(*.xls)|*.xls";
//设置默认文件类型显示顺序
saveFileDialog.FilterIndex = 1;
//是否自动在文件名中添加扩展名
saveFileDialog.AddExtension = true;
//是否记忆上次打开的目录
saveFileDialog.RestoreDirectory = true;
//设置默认文件名
saveFileDialog.FileName = FileName;
//按下确定选择的按钮
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
//获得文件路径
string localFilePath = saveFileDialog.FileName.ToString();
//数据初始化
int TotalCount; //总行数
int RowRead = 0; //已读行数
int Percent = 0; //百分比
TotalCount = 15;
//NPOI
IWorkbook workbook;
string FileExt = Path.GetExtension(localFilePath).ToLower();
if (FileExt == ".xlsx")
{
workbook = new XSSFWorkbook();
}
else if (FileExt == ".xls")
{
workbook = new HSSFWorkbook();
}
else
{
workbook = null;
}
if (workbook == null)
{
return;
}
ISheet sheet = string.IsNullOrEmpty(FileName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(FileName);
//秒钟
Stopwatch timer = new Stopwatch();
timer.Start();
try
{
//读取标题
IRow rowHeader = sheet.CreateRow(0);
for (int i = 0; i < TableName.Columns.Count; i++)
{
ICell cell = rowHeader.CreateCell(i);
cell.SetCellValue(TableName.Columns[i].ColumnName);
}
Application.DoEvents();
//转为字节数组
MemoryStream stream = new MemoryStream();
workbook.Write(stream);
var buf = stream.ToArray();
//保存为Excel文件
using (FileStream fs = new FileStream(localFilePath, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
fs.Close();
}
Application.DoEvents();
//关闭秒钟
timer.Reset();
timer.Stop();
//成功提示
if (MessageBox.Show("导出成功，是否立即打开？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
{
System.Diagnostics.Process.Start(localFilePath);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
//关闭秒钟
timer.Reset();
timer.Stop();
}
}
}
导入方法如下:
/// <summary>
/// 将excel导入到datatable
/// </summary>
/// <param name="nosqllist">存放数据库取出的编号list</param>
/// <param name="msge">返回结果</param>
/// <returns>返回datatable</returns>
public static DataTable ExcelToDataTable(List<string> nosqllist,out string msge)
{
bool isColumnName = true;//第一行是否是列名
msge = "0";
string filePath = "";//excel路径
List<string> NoList = new List<string>();//储存编号，防止重复
//打开文件对话框选择文件
OpenFileDialog file = new OpenFileDialog();
file.Filter = "Excel(*.xlsx)|*.xlsx|Excel(*.xls)|*.xls";
file.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
file.Multiselect = false;
if (file.ShowDialog() == DialogResult.OK)
{
filePath = file.FileName;
}
DataTable dataTable = null;
FileStream fs = null;
DataColumn column = null;
DataRow dataRow = null;
IWorkbook workbook = null;
ISheet sheet = null;
IRow row = null;
ICell cell = null;
IRow rowisrepeat = null;
ICell cellisrepeat = null;
int startRow = 0;
try
{
using (fs = File.OpenRead(filePath))
{
// 2007版本
if (filePath.IndexOf(".xlsx") > 0)
workbook = new XSSFWorkbook(fs);
// 2003版本
else if (filePath.IndexOf(".xls") > 0)
workbook = new HSSFWorkbook(fs);
if (workbook != null)
{
sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheet
dataTable = new DataTable();
if (sheet != null)
{
int rowCount = sheet.LastRowNum;//总行数
if (rowCount > 0)
{
IRow firstRow = sheet.GetRow(0);//第一行
#region 判断列名是否一致
string[] exlist = GetStringNum();//得到定义的标题
for(int i=0;i< exlist.Length;i++)
{
if(Convert.ToString(firstRow.Cells[i])!= exlist[i])
{
msge = "第"+i+1+"列标题不是"+exlist[i]+",列标题错误！";
return dataTable;
}
}
#endregion
int cellCount = firstRow.LastCellNum;//列数
//构建datatable的列
if (isColumnName)
{
startRow = 1;//如果第一行是列名，则从第二行开始读取
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
cell = firstRow.GetCell(i);
if (cell != null)
{
if (cell.StringCellValue != null)
{
column = new DataColumn(cell.StringCellValue);
dataTable.Columns.Add(column);
}
}
}
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
column = new DataColumn("column" + (i + 1));
dataTable.Columns.Add(column);
}
}
#region 判断编号是否有重复
NoList = nosqllist;
for (int i=startRow;i<=rowCount;++i)
{
rowisrepeat = sheet.GetRow(i);
if (rowisrepeat == null) continue;
cellisrepeat = rowisrepeat.GetCell(13);
string noisrpt = Convert.ToString(cellisrepeat);
if (!NoList.Contains(noisrpt))
{
NoList.Add(noisrpt);
}
else
{
msge = "编号:"+ noisrpt+"重复，插入失败，请确定编号唯一、无重复！";
return dataTable;
}
}
#endregion
//填充行
for (int i = startRow; i <= rowCount; ++i)
{
row = sheet.GetRow(i);
if (row == null) continue;
dataRow = dataTable.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
cell = row.GetCell(j);
if (cell == null)
{
dataRow[j] = "";
}
else
{
//CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
//对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理
if (format == 14 || format == 31 || format == 57 || format == 58)
dataRow[j] = cell.DateCellValue;
else
dataRow[j] = cell.NumericCellValue;
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
break;
}
}
}
dataTable.Rows.Add(dataRow);
}
}
}
}
}
return dataTable;
}
catch (Exception e)
{
msge = e.Message;
if (fs != null)
{
fs.Close();
}
return null;
}
}
/// <summary>
/// 定义待验证的Excel标题
/// </summary>
/// <returns></returns>
private static string[] GetStringNum()
{
string[] ExcelHeadList=new string[15] { "字段1", "字段2" , "字段3" , "字段4" , "字段5", "字段6","字段7", "字段8", "字段9", "字段10", "字段11", "字段12", "字段13", "字段14", "字段15" };
return ExcelHeadList;
}
