采用的是以DataGridView的形式导出，使用NPOI.dll
1.由于使用的是DataGridView，所以类需要创建在From的Project下，DLL导入NPOI
2.代码如下
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms; using NPOI.SS.UserModel; //NPOI using NPOI.HSSF.Util; //NPOI using NPOI.HSSF.UserModel; //NPOI using NPOI.XSSF.UserModel; //NPOI using System.IO; namespace ESMT { public class ExportExcel { /// <summary> /// /// </summary> /// <param name="grdview">数据表</param> /// <param name="sheetName">工作簿名字</param> /// <param name="FilePath">文件路径</param> /// <param name="columnTitle">列头</param> public void ExportToExcel(DataGridView grdview, string sheetName, string FilePath, string[] columnTitle) { //不允许dataGridView显示添加行，负责导出时会报最后一行未实例化错误 grdview.AllowUserToAddRows = false; HSSFWorkbook workbook = new HSSFWorkbook(); ISheet sheet = workbook.CreateSheet(sheetName);//创建工作簿 //设置表头 IRow headerRow = sheet.CreateRow(0);//创建第一行 headerRow.HeightInPoints = 40; headerRow.CreateCell(0).SetCellValue("出库表单");//单元格赋值 ICellStyle headStyle = workbook.CreateCellStyle(); headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//格式居中 IFont font = workbook.CreateFont(); font.Boldweight = 500; font.FontHeightInPoints = 20; headStyle.SetFont(font); headerRow.GetCell(0).CellStyle = headStyle; sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, grdview.ColumnCount - 2));//单元格合并 最后个参数是合并个数 IRow headerRow2 = sheet.CreateRow(1);//创建第二行列头 ICellStyle headStyle2 = workbook.CreateCellStyle(); headStyle2.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center; IFont font2 = workbook.CreateFont(); font2.FontHeightInPoints = 10; font2.Boldweight = 700; headStyle2.SetFont(font2); for (int l = 0; l < grdview.ColumnCount - 1; l++) //列头填值 { headerRow2.CreateCell(l).SetCellValue(columnTitle[l]); headerRow2.GetCell(l).CellStyle = headStyle2; } //设置列宽 for (int l = 0; l < grdview.Columns.Count; l++) { sheet.DefaultColumnWidth = 15; } //填写内容 for (int i = 0; i < grdview.Rows.Count; i++) { IRow row = sheet.CreateRow(i + 2); for (int j = 1; j < grdview.Columns.Count; j++) { row.CreateCell(j - 1, CellType.String).SetCellValue(grdview.Rows[i].Cells[j].Value.ToString());//j-1表示哪个单元格 } } using (FileStream stream = File.OpenWrite(FilePath))//创建Excel并写入数据 { workbook.Write(stream); stream.Close(); } GC.Collect(); } } }
PS：openwtrie 打开或者创建新的文件写入
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms; using NPOI.SS.UserModel; //NPOI using NPOI.HSSF.Util; //NPOI using NPOI.HSSF.UserModel; //NPOI using NPOI.XSSF.UserModel; //NPOI using System.IO; namespace ESMT { public class ExportExcel { /// <summary> /// ExportToExcel /// </summary> /// <param name="grdview">数据表</param> /// <param name="sheetName">工作簿名字</param> /// <param name="FilePath">文件路径</param> /// <param name="columnTitle">列头</param> public bool ExportToExcel(DataGridView grdview, string sheetName, string FilePath, string[] columnTitle, bool ischeckbox) { try { //不允许dataGridView显示添加行，负责导出时会报最后一行未实例化错误 grdview.AllowUserToAddRows = false; HSSFWorkbook workbook = new HSSFWorkbook(); ISheet sheet = workbook.CreateSheet(sheetName);//创建工作簿 //设置表头 IRow headerRow = sheet.CreateRow(0);//创建第一行 headerRow.HeightInPoints = 40; headerRow.CreateCell(0).SetCellValue("出库表单");//单元格赋值 ICellStyle headStyle = workbook.CreateCellStyle();// headStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//格式居中 headStyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//格式居中 IFont font = workbook.CreateFont(); font.Boldweight = 500; font.FontHeightInPoints = 20; headStyle.SetFont(font);//设置了第一行样式的字体 headerRow.GetCell(0).CellStyle = headStyle; sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, grdview.ColumnCount - 2));//单元格合并 最后个参数是合并个数 IRow headerRow2 = sheet.CreateRow(1);//创建第二行列头 ICellStyle headStyle2 = workbook.CreateCellStyle();//设置第二行的样式 headStyle2.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center; IFont font2 = workbook.CreateFont(); font2.FontHeightInPoints = 10; font2.Boldweight = 700; headStyle2.SetFont(font2); ICellStyle headStyle3 = workbook.CreateCellStyle();//内容的样式 headStyle3.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//格式居中 headStyle3.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//格式居中 for (int l = 0; l < grdview.ColumnCount - 1; l++) //列头填值 { headerRow2.CreateCell(l).SetCellValue(columnTitle[l]); headerRow2.GetCell(l).CellStyle = headStyle2; } //设置默认列宽 //sheet.DefaultColumnWidth = 15; //设置列宽 AutoColumnWidth(sheet, grdview.ColumnCount); //填写内容 for (int i = 0; i < grdview.Rows.Count; i++) { IRow row = sheet.CreateRow(i + 2); for (int j = 1; j < grdview.Columns.Count; j++) { if (ischeckbox) {//带checkbox的DataGrid row.CreateCell(j - 1, CellType.String).SetCellValue(grdview.Rows[i].Cells[j].Value.ToString()); row.GetCell(j - 1).CellStyle = headStyle3; }//j-1表示哪个单元格 else { row.CreateCell(j - 1, CellType.String).SetCellValue(grdview.Rows[i].Cells[j - 1].Value.ToString());//j-1表示哪个单元格 row.GetCell(j - 1).CellStyle = headStyle3; } } } using (FileStream stream = File.OpenWrite(FilePath))//创建Excel并写入数据 { workbook.Write(stream); stream.Close(); } GC.Collect(); return true;//导出成功 } catch (Exception) { return false;//导出失败 } } /// <summary> /// 自适应列宽 /// </summary> /// <param name="sheet"></param> /// <param name="cols"></param> public void AutoColumnWidth(ISheet sheet, int cols) { for (int col = 0; col < cols - 1; col++)//个数和列头个数统一 { sheet.AutoSizeColumn(col);//自适应宽度，但是其实还是比实际文本要宽 int columnWidth = sheet.GetColumnWidth(col) / 256;//获取当前列宽度 for (int rowIndex = 1; rowIndex <= sheet.LastRowNum; rowIndex++) { IRow row = sheet.GetRow(rowIndex); ICell cell = row.GetCell(col); int contextLength = Encoding.UTF8.GetBytes(cell.ToString()).Length;//获取当前单元格的内容宽度 columnWidth = columnWidth < contextLength ? contextLength : columnWidth; } sheet.SetColumnWidth(col, columnWidth * 400);//设置列宽 } } } }
3.From窗口点击导出按钮
string[] columnTitle = { "序号", "仓位", "Facility", "供应商料号", "料号", "料卷ID", "料卷数量", "储位号", "Date Code/Lot", "生产日期", "供应商编码", "入仓时间" }; string localFilePath = "";// fileNameExt, newFileName, FilePath; SaveFileDialog sfd = new SaveFileDialog();//保存文件窗口 //设置文件类型 sfd.Filter = "Excel(97-2003)|*.xls";//保存类型为EXCEL //保存对话框是否记忆上次打开的目录 sfd.RestoreDirectory = true; //点了保存按钮进入 if (sfd.ShowDialog() == DialogResult.OK) { localFilePath = sfd.FileName.ToString(); //获得文件路径 ex.ExportToExcel(grdData, "出库表单", localFilePath, columnTitle); }
通过以上三步，完成点击导出按钮，后选择保存位置并命名，调用EportExcel方法完成导出Excel。
PS：使用DataTable的操作是一样，只是赋值的时候取DataTable的值。GC 是自动垃圾收集 如果没有Checkbox的时候可以加入一个判断标记为 传参的时候加入，根据标记为来改变赋值情况。