前端上传excel文件利用npoi读取数据转换成datatable(netcore坑爹啊，用的vs2017竟然不能可视化)
前端界面
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Xlsx</title>
</head>
<body>
<form enctype="multipart/form-data" method="post" asp-action="ImportToDataTable">
<input type="file" name="excelfile" />
<input type="submit" value="上传" />
</form>
</body>
</html>
后台
/// <summary>
/// 导入EXCEL数据
/// </summary>
/// <param name="filePath">文件路径</param>
/// <returns></returns>
public void ImportToDataTable(IFormFile excelfile)
{
DataTable dt = new DataTable();
var filePath = excelfile.FileName.Split(‘.‘);
if (filePath[1].ToLower()==".xls")
{//.xls
#region .xls文件处理:HSSFWorkbook
HSSFWorkbook hssfworkbook;
try
{
using (MemoryStream ms = new MemoryStream())
{
excelfile.CopyTo(ms);
ms.Seek(0, SeekOrigin.Begin);
hssfworkbook = new HSSFWorkbook(ms);
}
ISheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
var maxRowIndex = 0;
while (rows.MoveNext())
{
IRow row = (HSSFRow)rows.Current;
var r = row.Cells.Select(p => p.StringCellValue).ToList();
var _result = row.Cells.Any(t => !string.IsNullOrEmpty(t.StringCellValue));
if (_result)
{
maxRowIndex = row.RowNum;
break;
}
}
HSSFRow headerRow = (HSSFRow)sheet.GetRow(maxRowIndex);//取第二行
var _ColumnIndex = new List<int>();
//一行最后一个方格的编号 即总的列数
for (int j = 0; j < (headerRow.LastCellNum); j++)
{
//SET EVERY COLUMN NAME
HSSFCell cell = (HSSFCell)headerRow.GetCell(j);
if (!string.IsNullOrEmpty(cell.StringCellValue))
{
dt.Columns.Add(cell.ToString());
_ColumnIndex.Add(cell.ColumnIndex);
}
}
while (rows.MoveNext())
{
IRow row = (HSSFRow)rows.Current;
DataRow dr = dt.NewRow();
if (row.RowNum <= headerRow.RowNum) continue;
for (int i = 0; i < _ColumnIndex.Count; i++)
{
if (i >= dt.Columns.Count)
{
break;
}
ICell cell = row.GetCell(_ColumnIndex[i]);
if ((i == 0) && cell == null)//每行第一个cell为空,break
{
break;
}
if (cell == null)
{
dr[i] = null;
}
else
{
switch (cell.CellType)
{
case CellType.String:
dr[i] = cell.StringCellValue;
break;
case CellType.Numeric:
if (DateUtil.IsCellDateFormatted(cell))
{
dr[i] = cell.DateCellValue;
}
else
{
dr[i] = cell.NumericCellValue;
}
break;
default:
dr[i] = null;
break;
}
}
}
dt.Rows.Add(dr);
}
}
catch (Exception e)
{
throw new Exception(e.Message, e);
}
#endregion
}
else
{//.xlsx
#region .xlsx文件处理:XSSFWorkbook
XSSFWorkbook hssfworkbook;
try
{
using (MemoryStream ms = new MemoryStream())
{
excelfile.CopyTo(ms);
ms.Seek(0, SeekOrigin.Begin);
hssfworkbook = new XSSFWorkbook(ms);
}
ISheet sheet = hssfworkbook.GetSheetAt(0);
// ISheet sheet = hssfworkbook.GetSheet(sheetName);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
var maxRowIndex = 0;
while (rows.MoveNext())
{
IRow row = (XSSFRow)rows.Current;
var _result = row.Cells.Any(t => !string.IsNullOrEmpty(t.StringCellValue));
if (_result)
{
maxRowIndex = row.RowNum;
break;
}
}
XSSFRow headerRow = (XSSFRow)sheet.GetRow(maxRowIndex);//取第二行
var _ColumnIndex = new List<int>();
//一行最后一个方格的编号 即总的列数
for (int j = 0; j < (headerRow.LastCellNum); j++)
{
//SET EVERY COLUMN NAME
XSSFCell cell = (XSSFCell)headerRow.GetCell(j);
if (!string.IsNullOrEmpty(cell.StringCellValue))
{
dt.Columns.Add(cell.ToString());
_ColumnIndex.Add(cell.ColumnIndex);
}
}
while (rows.MoveNext())
{
IRow row = (XSSFRow)rows.Current;
DataRow dr = dt.NewRow();
if (row.RowNum == 0) continue;
for (int i = 0; i < _ColumnIndex.Count; i++)
{
if (i >= dt.Columns.Count)
{
break;
}
ICell cell = row.GetCell(_ColumnIndex[i]);
if ((i == 0) && (cell == null))//每行第一个cell为空,break
{
break;
}
if (cell == null)
{
dr[i] = null;
}
else
{
switch (cell.CellType)
{
case CellType.String:
dr[i] = cell.StringCellValue;
break;
case CellType.Numeric:
if (DateUtil.IsCellDateFormatted(cell))
{
dr[i] = cell.DateCellValue;
}
else
{
dr[i] = cell.NumericCellValue;
}
break;
default:
dr[i] = null;
break;
}
}
}
dt.Rows.Add(dr);
}
}
catch (Exception e)
{
throw new Exception(e.Message, e);
}
#endregion
}
var a = dt.Rows.Count;//测试看是否有数据
}
原文地址：https://www.cnblogs.com/macT/p/11613663.html
时间： 2024-11-06 03:52:29