C# 使用NPOI 处理Excel（Datable与Excel相互转换）
2024-10-18 23:29:43
VS上有自带的程序集可以读取，但是总是会出现这样或那样的问题，让人恨得牙疼！而且效率太慢了。用NPOI就好多了，比较快，而且稳定，还简单，引用相应的程序集就好了。
Excel转换成Datable
private IWorkbook workbook = null;
private FileStream fs = null;
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public DataTable ExcelToDataTable(string fileName, bool isFirstRowColumn=true)
{
string sheetName = Path.GetFileName(fileName);
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = ;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileName.IndexOf(".xlsx") > ) // 2007版本
workbook = new XSSFWorkbook(fs);
else if (fileName.IndexOf(".xls") > ) // 2003版本
workbook = new HSSFWorkbook(fs); if (sheetName != null)
{
sheet = workbook.GetSheet(sheetName);
if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
{
sheet = workbook.GetSheetAt();
}
}
else
{
sheet = workbook.GetSheetAt();
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow();
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数 if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
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 + ;
}
else
{
startRow = sheet.FirstRowNum;
} //最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
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)
{
log.WriteLog("Exception: " + ex.Message);
return null;
}
}
Datable转换成Excel
private string fileName = null; //文件名
private IWorkbook workbook = null;
private FileStream fs = null;
private bool disposed; /// <summary>
/// 将DataTable数据导入到excel中
/// </summary>
/// <param name="data">要导入的数据</param>
/// <param name="isColumnWritten">DataTable的列名是否要导入</param>
/// <param name="sheetName">要导入的excel的sheet的名称</param>
/// <returns>导入数据行数(包含列名那一行)</returns>
public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
{
fileName = @"E:\11.xlsx";
int i = ;
int j = ;
int count = ;
ISheet sheet = null; FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
if (fileName.IndexOf(".xlsx") > ) // 2007版本
workbook = new XSSFWorkbook();
else if (fileName.IndexOf(".xls") > ) // 2003版本
workbook = new HSSFWorkbook(); try
{
if (workbook != null)
{
sheet = workbook.CreateSheet(sheetName);
}
else
{
return -;
} if (isColumnWritten == true) //写入DataTable的列名
{
IRow row = sheet.CreateRow();
for (j = ; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
}
count = ;
}
else
{
count = ;
} for (i = ; i < data.Rows.Count; ++i)
{
IRow row = sheet.CreateRow(count);
for (j = ; j < data.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
}
++count;
}
workbook.Write(fs); //写入到excel
return count;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return -;
}
}
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