ExcelReadManager.cs
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using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms.VisualStyles;
using TSA_V.Common;
namespace TSA_V
{
public class ExcelReadManager
{/// <summary>
/// 获取单元格类型
/// </summary>
/// <param name="cell">目标单元格</param>
/// <returns></returns>
private static object GetValueType(ICell cell)
{
if (cell == null)
return null;
switch (cell.CellType)
{
case CellType.Blank:
return null;
case CellType.Boolean:
return cell.BooleanCellValue;
case CellType.Numeric:
return cell.NumericCellValue;
case CellType.String:
return cell.StringCellValue;
case CellType.Error:
return cell.ErrorCellValue;
case CellType.Formula:
default:
return "=" + cell.CellFormula;
}
}
/// <summary>
/// Excel导入成DataTble
/// </summary>
/// <param name="file">导入路径(包含文件名与扩展名)</param>
/// <returns></returns>
public static DataTable ExcelToTable(string file)
{
DataTable dt = new DataTable();
IWorkbook workbook;
string fileExt = Path.GetExtension(file).ToLower();
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
{
if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(fs); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(fs); } else { workbook = null; }
if (workbook == null) { return null; }
ISheet sheet = workbook.GetSheetAt(0);
//表头
IRow header = sheet.GetRow(sheet.FirstRowNum);
List<int> columns = new List<int>();
for (int i = 0; i < header.LastCellNum; i++)
{
object obj = GetValueType(header.GetCell(i));
if (obj == null || obj.ToString() == string.Empty)
{
dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
}
else
dt.Columns.Add(new DataColumn(obj.ToString()));
columns.Add(i);
}
//数据
for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
{
DataRow dr = dt.NewRow();
bool hasValue = false;
foreach (int j in columns)
{
dr[j] = GetValueType(sheet.GetRow(i).GetCell(j));
if (dr[j] != null && dr[j].ToString() != string.Empty)
{
hasValue = true;
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
}
}
return dt;
}
public static List<List<string>> ReadFile(string fileName, out List<string> titleList)
{
titleList = new List<string>();
List<List<string>> mapValue = new List<List<string>>();
try
{
DataTable dt = new DataTable();
IWorkbook workbook;
string fileExt = Path.GetExtension(fileName).ToLower();
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
if (fileExt == ".xlsx")
{
workbook = new XSSFWorkbook(fs);
}
else if (fileExt == ".xls")
{
workbook = new HSSFWorkbook(fs);
}
else { workbook = null; }
if (workbook == null)
{
return null;
}
ISheet sheet = workbook.GetSheetAt(0);
//表头
IRow header = sheet.GetRow(sheet.FirstRowNum);
List<int> columns = new List<int>();
for (int i = 0; i < header.LastCellNum; i++)
{
object obj = GetValueType(header.GetCell(i));
if (obj == null || obj.ToString() == string.Empty)
{
dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
titleList.Add("Columns" + i.ToString());
}
else
{
dt.Columns.Add(new DataColumn(obj.ToString()));
titleList.Add(obj.ToString());
}
columns.Add(i);
}
//数据
for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
{
List<string> data = new List<string>();
DataRow dr = dt.NewRow();
bool hasValue = false;
foreach (int j in columns)
{
dr[j] = GetValueType(sheet.GetRow(i).GetCell(j));
if (dr[j] != null && dr[j].ToString() != string.Empty)
{
hasValue = true;
data.Add(dr[j].ToString());
}
else
{
data.Add("");
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
mapValue.Add(data);
}
}
return mapValue;
}
catch (Exception ex)
{
LogUtil.error("read file " + fileName + " error :" + ex.ToString());
}
return mapValue;
}
}
}