C#代码实现把Excel文件转化为DataTable，根据Excel的文件后缀名不同，用不同的方法来进行实现，下面通过根据Excel文件的两种后缀名（*.xlsx和*.xls）分别来实现。获取文件后缀名的方法是：Path.GetExtension(fileName)方法，通过引用：using System.IO;实现代码如下：（其中以下代码中出现的filename都是带盘符的绝对路径）
根据Excel文件的后缀名不同调用的主方法
private DataTable FileToDataTable(string fileName)
{
DataTable dt = new DataTable(); string extendName = Path.GetExtension(fileName);//获取文件的后缀名
switch (extendName.ToLower())
{ case ".xls":
dt = XlsToDataTable(fileName); break; case ".xlsx":
dt = XlsxToDataTable(fileName); break; default: break;
} return dt;
}
XlsToDataTable()
private DataTable XlsToDataTable(string fileName)
{
DataTable dataTable = new DataTable();
Stream stream = null; try
{
stream = File.OpenRead(fileName);
HSSFWorkbook hssfworkbook = new HSSFWorkbook(stream);
HSSFSheet hssfsheet = (HSSFSheet)hssfworkbook.GetSheetAt(hssfworkbook.ActiveSheetIndex);
HSSFRow hssfrow = (HSSFRow)hssfsheet.GetRow(0); int lastCellNum = (int)hssfrow.LastCellNum; for (int i = (int)hssfrow.FirstCellNum; i < lastCellNum; i++)
{
DataColumn column = new DataColumn(hssfrow.GetCell(i).StringCellValue);
dataTable.Columns.Add(column);
}
dataTable.TableName = hssfsheet.SheetName; int lastRowNum = hssfsheet.LastRowNum; //列名后,从TABLE第二行开始进行填充数据
for (int i = hssfsheet.FirstRowNum + 1; i < hssfsheet.LastRowNum; i++)// {
HSSFRow hssfrow2 = (HSSFRow)hssfsheet.GetRow(i);
DataRow dataRow = dataTable.NewRow(); for (int j = (int)hssfrow2.FirstCellNum; j < lastCellNum; j++)// {
dataRow[j] = hssfrow2.GetCell(j);// }
dataTable.Rows.Add(dataRow);
}
stream.Close();
} catch (Exception ex)
{
ScriptManager.RegisterStartupScript(Page, GetType(), "alertForm", "alert(' Xls to DataTable: " + ex.Message + "');", true);
} finally
{ if (stream != null)
{
stream.Close();
}
} return dataTable;
}
XlsxToDataTable()
public DataTable XlsxToDataTable(string vFilePath)
{
DataTable dataTable = new DataTable(); try
{
SLDocument sldocument = new SLDocument(vFilePath);
dataTable.TableName = sldocument.GetSheetNames()[0];
SLWorksheetStatistics worksheetStatistics = sldocument.GetWorksheetStatistics(); int startColumnIndex = worksheetStatistics.StartColumnIndex; int endColumnIndex = worksheetStatistics.EndColumnIndex; int startRowIndex = worksheetStatistics.StartRowIndex; int endRowIndex = worksheetStatistics.EndRowIndex; for (int i = startColumnIndex; i <= endColumnIndex; i++)
{
SLRstType cellValueAsRstType = sldocument.GetCellValueAsRstType(1, i);
dataTable.Columns.Add(new DataColumn(cellValueAsRstType.GetText(), typeof(string)));
} for (int j = startRowIndex + 1; j <= endRowIndex; j++)
{
DataRow dataRow = dataTable.NewRow(); for (int i = startColumnIndex; i <= endColumnIndex; i++)
{
dataRow[i - 1] = sldocument.GetCellValueAsString(j, i);
}
dataTable.Rows.Add(dataRow);
}
} catch (Exception ex)
{ throw new Exception("Xlsx to DataTable: \n" + ex.Message);
} return dataTable;
}
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