C# NPOI Export DataTable C# NPOI导出DataTable 单元格自适应大小

1.Install-Package NPOI -v 2.4.0

2.

using NPOI.XSSF;
using NPOI.XSSF.UserModel;
using NPOI.SS.UserModel;
using System.IO;
static void ExportDataTable(DataTable dt)
        {
            string exportedExcelFullName = Directory.GetCurrentDirectory() + "//" + DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".xlsx";
            if(dt!=null && dt.Rows.Count>)
            {
                XSSFWorkbook workBook = new XSSFWorkbook();
                ISheet firstSheet = workBook.CreateSheet("First Sheet");
                IRow headerRow = firstSheet.CreateRow();

                for(int i=;i<dt.Columns.Count;i++)
                {
                    ICell headerCell = headerRow.CreateCell(i);
                    headerCell.SetCellValue(dt.Columns[i].ColumnName?.ToString());
                }                

                for (int i = ; i < dt.Rows.Count; i++)
                {
                    IRow dataRow = firstSheet.CreateRow(i + );
                    for(int j=;j<dt.Columns.Count;j++)
                    {
                        ICell dataCell = dataRow.CreateCell(j);
                        dataCell.SetCellValue(dt.Rows[i][j]?.ToString());
                    }
                }
                for(int i=;i<dt.Columns.Count;i++)
                {
                    firstSheet.AutoSizeColumn(i);
                }                

                using (FileStream excelStream = File.Create(exportedExcelFullName))
                {
                    workBook.Write(excelStream);
                }
            }
        }

3.让Excel单元格自适应单元格大小

for(int i=0;i<dt.Columns.Count;i++)
{
firstSheet.AutoSizeColumn(i);
}

最后效果：