excel to datatable (c#用NPOI将excel文件内容读取到datatable数据表中)

将excel文件内容读取到datatable数据表中,支持97-2003和2007两种版本的excel

1.第一种是根据excel文件路径读取excel并返回datatable

/// <summary>
/// 将excel文件内容读取到DataTable数据表中
/// </summary>
/// <param name="fileName">文件完整路径名</param>
/// <param name="sheetName">指定读取excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名：true=是，false=否</param>
/// <returns>DataTable数据表</returns>
public static DataTable ReadExcelToDataTable(string fileName, string sheetName = null, bool isFirstRowColumn = true)
{
//定义要返回的datatable对象
DataTable data = new DataTable();
//excel工作表
Npoi.SS.UserModel.ISheet sheet = null;
//数据开始行(排除标题行)
int startRow = 0;
try
{
if (!File.Exists(fileName))
{
return null;
}
//根据指定路径读取文件
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
//根据文件流创建excel数据结构
Npoi.SS.UserModel.IWorkbook workbook = Npoi.SS.UserModel.WorkbookFactory.Create(fs);
//IWorkbook workbook = new HSSFWorkbook(fs);
//如果有指定工作表名称
if (!string.IsNullOrEmpty(sheetName))
{
sheet = workbook.GetSheet(sheetName);
//如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
if (sheet == null)
{
sheet = workbook.GetSheetAt(0);
}
}
else
{
//如果没有指定的sheetName，则尝试获取第一个sheet
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
Npoi.SS.UserModel.IRow firstRow = sheet.GetRow(0);
//一行最后一个cell的编号 即总的列数
int cellCount = firstRow.LastCellNum;
//如果第一行是标题列名
if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
Npoi.SS.UserModel.ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
Npoi.SS.UserModel.IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null　　　　　　　

DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
}
return data;
}
catch (Exception ex)
{
throw ex;
}
}

/// <summary>
/// 将文件流读取到DataTable数据表中
/// </summary>
/// <param name="fileStream">文件流</param>
/// <param name="sheetName">指定读取excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名：true=是，false=否</param>
/// <returns>DataTable数据表</returns>
public static DataTable ReadStreamToDataTable(Stream fileStream, string sheetName = null, bool isFirstRowColumn = true)
{
//定义要返回的datatable对象
DataTable data = new DataTable();
//excel工作表
Npoi.SS.UserModel.ISheet sheet = null;
//数据开始行(排除标题行)
int startRow = 0;
try
{
//根据文件流创建excel数据结构,NPOI的工厂类WorkbookFactory会自动识别excel版本，创建出不同的excel数据结构
Npoi.SS.UserModel.IWorkbook workbook = Npoi.SS.UserModel.WorkbookFactory.Create(fileStream);
//如果有指定工作表名称
if (!string.IsNullOrEmpty(sheetName))
{
sheet = workbook.GetSheet(sheetName);
//如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
if (sheet == null)
{
sheet = workbook.GetSheetAt(0);
}
}
else
{
//如果没有指定的sheetName，则尝试获取第一个sheet
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
Npoi.SS.UserModel.IRow firstRow = sheet.GetRow(0);
//一行最后一个cell的编号 即总的列数
int cellCount = firstRow.LastCellNum;
//如果第一行是标题列名
if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
Npoi.SS.UserModel.ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + 1;
}
else
{
startRow = sheet.FirstRowNum;
}
//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
Npoi.SS.UserModel.IRow row = sheet.GetRow(i);
if (row == null || row.FirstCellNum < 0) continue; //没有数据的行默认是null　　　　　　　

DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
//同理，没有数据的单元格都默认是null
Npoi.SS.UserModel.ICell cell = row.GetCell(j);
if (cell != null)
{
if (cell.CellType == Npoi.SS.UserModel.CellType.Numeric)
{
//判断是否日期类型
if (Npoi.SS.UserModel.DateUtil.IsCellDateFormatted(cell))
{
dataRow[j] = row.GetCell(j).DateCellValue;
}
else
{
dataRow[j] = row.GetCell(j).ToString().Trim();
}
}
else
{
dataRow[j] = row.GetCell(j).ToString().Trim();
}
}
}
data.Rows.Add(dataRow);
}
}
return data;
}
catch (Exception ex)
{
throw ex;
}
}