利用NPOI解析Excel的通用类
2024-10-21 05:53:43
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System; public class ExcelHelp
{
public class x2003
{
#region Excel2003
/// <summary>
/// 将Excel文件中的数据读出到DataTable中(xls)
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public static DataTable ExcelToTableForXLS(string file)
{
DataTable dt = new DataTable();
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
{
HSSFWorkbook hssfworkbook = new HSSFWorkbook(fs);
ISheet sheet = hssfworkbook.GetSheetAt(); //表头
IRow header = sheet.GetRow(sheet.FirstRowNum);
List<int> columns = new List<int>();
for (int i = ; i < header.LastCellNum; i++)
{
object obj = GetValueTypeForXLS(header.GetCell(i) as HSSFCell);
if (obj == null || obj.ToString() == string.Empty)
{
dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
//continue;
}
else
dt.Columns.Add(new DataColumn(obj.ToString()));
columns.Add(i);
}
//数据
for (int i = sheet.FirstRowNum + ; i <= sheet.LastRowNum; i++)
{
DataRow dr = dt.NewRow();
bool hasValue = false;
foreach (int j in columns)
{
dr[j] = GetValueTypeForXLS(sheet.GetRow(i).GetCell(j) as HSSFCell);
if (dr[j] != null && dr[j].ToString() != string.Empty)
{
hasValue = true;
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
}
}
return dt;
} /// <summary>
/// 将DataTable数据导出到Excel文件中(xls)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static void TableToExcelForXLS(DataTable dt, string file)
{
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
ISheet sheet = hssfworkbook.CreateSheet("Test"); //表头
IRow row = sheet.CreateRow();
for (int i = ; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
} //数据
for (int i = ; i < dt.Rows.Count; i++)
{
IRow row1 = sheet.CreateRow(i + );
for (int j = ; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
} //转为字节数组
MemoryStream stream = new MemoryStream();
hssfworkbook.Write(stream);
var buf = stream.ToArray(); //保存为Excel文件
using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, , buf.Length);
fs.Flush();
}
} /// <summary>
/// 获取单元格类型(xls)
/// </summary>
/// <param name="cell"></param>
/// <returns></returns>
private static object GetValueTypeForXLS(HSSFCell cell)
{
if (cell == null)
return null;
switch (cell.CellType)
{
case CellType.Blank: //BLANK:
return null;
case CellType.Boolean: //BOOLEAN:
return cell.BooleanCellValue;
case CellType.Numeric: //NUMERIC:
return cell.NumericCellValue;
case CellType.String: //STRING:
return cell.StringCellValue;
case CellType.Error: //ERROR:
return cell.ErrorCellValue;
case CellType.Formula: //FORMULA:
default:
return "=" + cell.CellFormula;
}
}
#endregion
} public class x2007
{
#region Excel2007
/// <summary>
/// 将Excel文件中的数据读出到DataTable中(xlsx)
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public static DataTable ExcelToTableForXLSX(string file)
{
DataTable dt = new DataTable();
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
{
XSSFWorkbook xssfworkbook = new XSSFWorkbook(fs);
ISheet sheet = xssfworkbook.GetSheetAt(); //表头
IRow header = sheet.GetRow(sheet.FirstRowNum);
List<int> columns = new List<int>();
for (int i = ; i < header.LastCellNum; i++)
{
object obj = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell);
if (obj == null || obj.ToString() == string.Empty)
{
dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
//continue;
}
else
dt.Columns.Add(new DataColumn(obj.ToString()));
columns.Add(i);
}
//数据
for (int i = sheet.FirstRowNum + ; i <= sheet.LastRowNum; i++)
{
DataRow dr = dt.NewRow();
bool hasValue = false;
foreach (int j in columns)
{
dr[j] = GetValueTypeForXLSX(sheet.GetRow(i).GetCell(j) as XSSFCell);
if (dr[j] != null && dr[j].ToString() != string.Empty)
{
hasValue = true;
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
}
}
return dt;
} /// <summary>
/// 将DataTable数据导出到Excel文件中(xlsx)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static void TableToExcelForXLSX(DataTable dt, string file)
{
XSSFWorkbook xssfworkbook = new XSSFWorkbook();
ISheet sheet = xssfworkbook.CreateSheet("sheet1"); //表头
IRow row = sheet.CreateRow();
for (int i = ; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
} //数据
for (int i = ; i < dt.Rows.Count; i++)
{
IRow row1 = sheet.CreateRow(i + );
for (int j = ; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
} //转为字节数组
MemoryStream stream = new MemoryStream();
xssfworkbook.Write(stream);
var buf = stream.ToArray(); //保存为Excel文件
using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, , buf.Length);
fs.Flush();
}
} /// <summary>
/// 获取单元格类型(xlsx)
/// </summary>
/// <param name="cell"></param>
/// <returns></returns>
private static object GetValueTypeForXLSX(XSSFCell cell)
{
if (cell == null)
return null;
switch (cell.CellType)
{
case CellType.Blank: //BLANK:
return null;
case CellType.Boolean: //BOOLEAN:
return cell.BooleanCellValue;
case CellType.Numeric: //NUMERIC:
return cell.NumericCellValue;
case CellType.String: //STRING:
return cell.StringCellValue;
case CellType.Error: //ERROR:
return cell.ErrorCellValue;
case CellType.Formula: //FORMULA:
default:
return "=" + cell.CellFormula;
}
}
#endregion
} public static DataTable GetDataTable(string filepath)
{
try
{
var dt = new DataTable("xls");
if (filepath.Last() == 's')
{
dt = x2003.ExcelToTableForXLS(filepath);
}
else
{
dt = x2007.ExcelToTableForXLSX(filepath);
}
return dt;
}
catch (Exception ex)
{
return null;
}
} /// <summary>
/// 将Excel文件中的数据读出到DataTable中
/// </summary>
/// <param name="file">文件路径</param>
/// <param name="sheetName">工作表名称</param>
/// <param name="columnTypeDic">列名与列类型字典</param>
/// <returns>DataTable</returns>
public static DataTable ImportToTable(string file, string sheetName = "", Dictionary<string, Type> columnTypeDic = null)
{
DataTable dt = null;
FileStream fs = null;
try
{
fs = new FileStream(file, FileMode.Open, FileAccess.Read);
IWorkbook workbook = WorkbookFactory.Create(fs);
ISheet sheet = string.IsNullOrEmpty(sheetName) ? workbook.GetSheetAt() : workbook.GetSheet(sheetName);
if (sheet == null) return null;
dt = SheetToDataTable(sheet, columnTypeDic);
fs.Close();
return dt;
}
catch (Exception ex)
{
if (fs != null)
{
fs.Close();
}
return dt;
}
}
/// <summary>
/// 将Excel文件中的数据读出到DataSet中
/// </summary>
/// <param name="file">Excel文件路径</param>
/// <param name="columnTypeDic">列名与列类型字典</param>
/// <returns>DataSet</returns>
public static DataSet ImportToDataSet(string file, Dictionary<string, Type> columnTypeDic = null)
{
DataSet ds = new DataSet();
FileStream fs = null;
try
{
fs = new FileStream(file, FileMode.Open, FileAccess.Read);
IWorkbook workbook = WorkbookFactory.Create(fs);
int sheetCount = workbook.NumberOfSheets;
for (int i = ; i < sheetCount; i++)
{
ISheet sheet = workbook.GetSheetAt(i);
if (sheet == null) continue;
DataTable dt = SheetToDataTable(sheet, columnTypeDic);
ds.Tables.Add(dt);
}
fs.Close();
return ds;
}
catch (Exception ex)
{
if (fs != null)
{
fs.Close();
}
return ds;
}
}
/// <summary>
/// 将Sheet中的数据读出到DataTable中
/// </summary>
/// <param name="sheet">ISheet</param>
/// <param name="columnTypeDic">列名与列类型字典</param>
/// <returns>DataTable</returns>
private static DataTable SheetToDataTable(ISheet sheet, Dictionary<string, Type> columnTypeDic)
{
DataTable dt = new DataTable(sheet.SheetName);
//表头
IRow header = sheet.GetRow(sheet.FirstRowNum);
if (header == null) return dt;
for (int i = ; i < header.LastCellNum; i++)
{
ICell cell = header.GetCell(i);
object obj = GetCellValue(cell);
string columnName = "";
if (obj == null || string.IsNullOrEmpty(obj.ToString()) || dt.Columns.Contains(obj.ToString()))
columnName = "Columns" + i;
else
columnName = obj.ToString();
if (obj != null && dt.Columns.Contains(obj.ToString()))
{
}
if (columnTypeDic != null && columnTypeDic.ContainsKey(columnName))
dt.Columns.Add(columnName, columnTypeDic[columnName]);
else
dt.Columns.Add(columnName);
} //数据
int firstRowNum = sheet.FirstRowNum;//耗时操作，只读一次，提升效率
int lastRowNum = sheet.LastRowNum;
for (int i = firstRowNum + ; i <= lastRowNum; i++)
{
DataRow dr = dt.NewRow();
bool hasValue = false;
for (int j = ; j < header.LastCellNum; j++)
{
IRow row = sheet.GetRow(i);
if (row == null) continue;
ICell cell = row.GetCell(j);
if (cell == null) continue;
dr[j] = GetCellValue(cell);
if (dr[j] != null && dr[j].ToString() != string.Empty)
{
hasValue = true;
}
}
if (hasValue)
{
dt.Rows.Add(dr);
}
}
return dt;
}
/// <summary>
/// 获取单元格的值
/// </summary>
/// <param name="cell">ICell</param>
/// <returns>object</returns>
private static object GetCellValue(ICell cell)
{
if (cell == null)
return null;
try
{
CellType cellType = cell.CellType == CellType.Formula ? cell.CachedFormulaResultType : cell.CellType;
switch (cellType)
{
case CellType.Blank: //BLANK:
return null;
case CellType.Boolean: //BOOLEAN:
return cell.BooleanCellValue;
case CellType.Numeric: //NUMERIC:
if (HSSFDateUtil.IsCellDateFormatted(cell))//日期类型
{
return cell.DateCellValue;
}
else//其他数字类型
{
return cell.NumericCellValue;
}
case CellType.String: //STRING:
return cell.StringCellValue;
case CellType.Error: //ERROR:
return cell.ErrorCellValue;
default:
return null;
}
}
catch (Exception ex)
{
return null;
}
}
}
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