本文为大家分享了C#通过NPOI导入导出数据EXCEL的具体代码，供大家参考。
其实从数据库到服务器导入导出有很多方法，但是比较简单的有NPOI这个方法
准备工作，先增加到相应的lib，同时引用相关的dll
第一从数据库导出数据到Excel里面
首先我设置一个win窗体
第二步写代码
private void button1_Click(object sender, EventArgs e)
{
//查询数据,显示到表格上
ManagerInfoBll miBll = new ManagerInfoBll();
var list = miBll.GetList();
dataGridView1.DataSource = list;
//进行excel 生成创建操作
//1 创建workboook ,不指定参数,表示创建一个新的工作本
HSSFWorkbook workbook = new HSSFWorkbook();
//2创建sheet
HSSFSheet sheet = workbook.CreateSheet("管理员");
//3创建row
HSSFRow row = sheet.CreateRow(0);
//4创建cell
HSSFCell cell0 = row.CreateCell(0);
cell0.SetCellValue("管理员表");
//5设置合并单元格
sheet.AddMergedRegion(new NPOI.HSSF.Util.Region(0, 0, 0, 3));
//6设置居中
HSSFCellStyle styleTitle = workbook.CreateCellStyle();
styleTitle.Alignment = 2;
cell0.CellStyle = styleTitle;
//6.1设置字体
HSSFFont fontTitle = workbook.CreateFont();
fontTitle.FontHeightInPoints = 14;
styleTitle.SetFont(fontTitle);
//7创建标题行
//7.1创建行
HSSFRow rowTitle = sheet.CreateRow(1);
//7.2创建单元格
HSSFCell cellTitle0 = rowTitle.CreateCell(0);
cellTitle0.SetCellValue("编号");
cellTitle0.CellStyle = styleTitle;
HSSFCell cellTitle1 = rowTitle.CreateCell(1);
cellTitle1.SetCellValue("姓名");
cellTitle1.CellStyle = styleTitle;
HSSFCell cellTitle2 = rowTitle.CreateCell(2);
cellTitle2.SetCellValue("密码");
cellTitle2.CellStyle = styleTitle;
HSSFCell cellTitle3 = rowTitle.CreateCell(3);
cellTitle3.SetCellValue("类型");
cellTitle3.CellStyle = styleTitle;
int rowIndex = 2;
//8.1遍历集合
foreach (var mi in list)
{//8.2创建行
HSSFRow rowData = sheet.CreateRow(rowIndex++);
//8.3创建单元格
HSSFCell cellData0 = rowData.CreateCell(0);
cellData0.SetCellValue(mi.MId);
HSSFCell cellData1 = rowData.CreateCell(1);
cellData1.SetCellValue(mi.MName);
HSSFCell cellData2 = rowData.CreateCell(2);
cellData2.SetCellValue(mi.MPwd);
HSSFCell cellData3 = rowData.CreateCell(3);
cellData0.SetCellValue(mi.MType==1?"经理":"店员");
}
//8 保持文本
FileStream stream = new FileStream("", FileMode.Create);
workbook.Write(stream);//
stream.Close();
stream.Dispose();
}
最后效果
第二从Excel导入到数据库中
private void button2_Click(object sender, EventArgs e)
{
//1读取excel 数据,存入list
List<ManagerInfo> list = new List<ManagerInfo>();
//1.1读取文件 路径
using (FileStream stream= new FileStream("",FileMode.Open))
{
//1.2创建workbook
HSSFWorkbook workbook = new HSSFWorkbook(stream);
//1.3读取sheet
HSSFSheet sheet = workbook.GetSheetAt(0);
//1.4读取正文数据主要从表格开始看起 第三行开始
int rowindex = 2;
HSSFRow row = sheet.GetRow(10);
while ( row==null)
{
//1.5读到数据返回行对象
ManagerInfo mi = new ManagerInfo();
mi.MId = (int)row.GetCell(0).NumericCellValue;
mi.MName = row.GetCell(1).StringCellValue;
mi.MPwd = row.GetCell(2).StringCellValue;
mi.MType=row.GetCell(3).StringCellValue=="经理"?1 : 0;
list.Add(mi);
row = sheet.GetRow(rowindex++);
}
}
//2将list赋值给dataGridview
dataGridView1.DataSource = list;
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/liuweiqiang11188/article/details/72082019
