Excel导入导出提示代码

HSSFWorkbook hssfworkbook = new HSSFWorkbook();//工作簿
ISheet sheet1 = hssfworkbook.CreateSheet("第一页");//页
IRow rowHeader = sheet1.CreateRow(0);//行
rowHeader.CreateCell(0, CellType.STRING).SetCellValue("姓名");
rowHeader.CreateCell(1, CellType.STRING).SetCellValue("工资");
rowHeader.CreateCell(2, CellType.STRING).SetCellValue("入职时间");
rowHeader.CreateCell(3, CellType.STRING).SetCellValue("出生日期");
SaveFileDialog openFile = new SaveFileDialog();
openFile.Filter = "Excet文件|*.xls|07Excel|*..xlsx";
if(openFile .ShowDialog ()==true)
{
using (Stream stream= File.OpenWrite(openFile .FileName ))
{
//List<Employee> employee = (List<Employee>)datagrid.ItemsSource;
Employee[] employeeList = (Employee[])datagrid.ItemsSource; ;
//employeeList = employee.ToArray();
for (int i = 0; i < employeeList.Count(); i++)
{
Employee employee1 = employeeList [i];
IRow rowContent=sheet1 .CreateRow (i+1);
rowContent.CreateCell(0, CellType.STRING).SetCellValue(employee1.Name);
rowContent.CreateCell(1, CellType.STRING).SetCellValue(employee1.BaseSalary );
//数据量太大 导致下面无法执行
//ICellStyle styleDate = hssfworkbook.CreateCellStyle();
//IDataFormat format = hssfworkbook.CreateDataFormat();
//styleDate.DataFormat = format.GetFormat("yyyy\"年\"m\"月\"d\"日\"");
//ICell cellInDate = rowContent.CreateCell(2, CellType.NUMERIC);
//cellInDate.CellStyle = styleDate;
//cellInDate.SetCellValue(employee1.InDate);
//ICell cellBirthday = rowContent.CreateCell(3, CellType.NUMERIC);
//cellBirthday.CellStyle = styleDate;
//cellBirthday.SetCellValue(employee1.BirthDay);
}
hssfworkbook.Write(stream);
}

HSSFWorkbook hssfworkbook;
//创建一个Excel簿，并读入一个文件流
public void InitializeWorkbook(string path)
{
using (FileStream file=new FileStream (path ,FileMode .Open ,FileAccess .Read ))
{
hssfworkbook = new HSSFWorkbook(file);
}
}
//将Excel表转换成DataTable表
public DataTable ConverToDataTable()
{
ISheet sheet = hssfworkbook.GetSheetAt(0);//获取Excel簿的页
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
DataTable table = new DataTable("T_Operator");
while (rows.MoveNext())
{
HSSFRow row = (HSSFRow)rows.Current;
DataRow dr = table.NewRow();
for (int j = 0; j < row.LastCellNum; j++)
{
table.Columns.Add(Convert.ToChar(((int)'A') + j).ToString());
}
for (int i = 0; i < row.LastCellNum; i++)
{
ICell cell = row.GetCell(i);
if (cell == null)
{
dr[i] = null;
}
else
{
switch (cell.CellType)
{
case CellType .BLANK:
dr[i] = "[null]";
break;
case CellType.BOOLEAN:
dr[i] = cell.BooleanCellValue;
break;
case CellType.NUMERIC:
dr[i] = cell.ToString();    //This is a trick to get the correct value of the cell. NumericCellValue will return a numeric value no matter the cell value is a date or a number.
break;
case CellType.STRING:
dr[i] = cell.StringCellValue;
break;
case CellType.ERROR:
dr[i] = cell.ErrorCellValue;
break;
case CellType.FORMULA:
default:
dr[i] = "=" + cell.CellFormula;
break;
}
//dr[i] = cell;
}
}
table.Rows.Add(dr);
}
return table;
}
private void btnImpot_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog openfile = new OpenFileDialog();
openfile.Filter = "Excel文件|.xls|07Excel|.xlsx|*|*.*";
if (openfile.ShowDialog() == true)
{
InitializeWorkbook(openfile.FileName);
DataTable table = ConverToDataTable();
foreach (DataRow dr in table.Rows)
{
Operator op = ToOperator (dr);
OperatorDAL opDAL = new OperatorDAL();
opDAL.Insert(op);
}
}
}
private Operator ToOperator(DataRow row)
{
Operator op = new Operator();
//op.Id = (Guid)row[0];
op.UserName = (string)row[1];
op.Password = (string)row[2];
op.IsDeleted = (bool)row[3];
op.RealName = (string)row[4];
op.IsLocked = (bool)row[5];
return op;
}