安装
Install-Package NPOI
ExcelHelper
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.Data;
using System.IO;
namespace ConsoleApp1
{
public class ExcelHelper
{
/// <summary>
/// 根据Excel文件类型返回IWorkbook
/// </summary>
/// <param name="fileName">文件路径</param>
/// <returns></returns>
private IWorkbook GetWorkbook(string fileName)
{
if (File.Exists(fileName))
{
using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
if (Path.GetExtension(fileName).Equals(".xlsx")) return new XSSFWorkbook(fs);
else return new HSSFWorkbook(fs);
}
}
else
{
if (Path.GetExtension(fileName).Equals(".xlsx")) return new XSSFWorkbook();
else return new HSSFWorkbook();
}
}
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="fileName">excel文件路径</param>
/// <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 = null)
{
DataTable data = new DataTable();
IWorkbook workbook = GetWorkbook(fileName);
ISheet sheet;
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(0);
}
}
else
{
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
if (firstRow != null)
{
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
int startRow;
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 + 1;
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(i.ToString());
data.Columns.Add(column);
}
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;
}
/// <summary>
/// 将DataTable中的数据导入到excel中
/// </summary>
/// <param name="dt">DataTable</param>
/// <param name="path">文件路径</param>
public void DataTableToExcel(DataTable dt, string path)
{
IWorkbook workbook = GetWorkbook(path);
ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(dt.TableName);//创建工作表
#region 标题
IRow row = sheet.CreateRow(0);//在工作表中添加一行
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);//在行中添加一列
cell.SetCellValue(dt.Columns[i].ColumnName);//设置列的内容
}
#endregion
#region 填充数据
for (int i = 1; i <= dt.Rows.Count; i++)//遍历DataTable行
{
DataRow dataRow = dt.Rows[i - 1];
row = sheet.CreateRow(i);//在工作表中添加一行
for (int j = 0; j < dt.Columns.Count; j++)//遍历DataTable列
{
ICell cell = row.CreateCell(j);//在行中添加一列
cell.SetCellValue(dataRow[j].ToString());//设置列的内容
}
}
#endregion
#region 输出Excel
MemoryStream ms = new MemoryStream();
workbook.Write(ms);
using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
byte[] bArr = ms.ToArray();
fs.Write(bArr, 0, bArr.Length);
fs.Flush();
}
#endregion
}
/// <summary>
/// 将excel中的数据导入到DataSet中
/// </summary>
/// <param name="fileName">excel文件路径</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public DataSet ExcelToDataSet(string fileName, bool isFirstRowColumn = true)
{
DataSet ds = new DataSet();
IWorkbook workbook = GetWorkbook(fileName);
for (int e = 0; e < workbook.NumberOfSheets; e++)
{
DataTable data = new DataTable();
ISheet sheet = workbook.GetSheetAt(e);
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
if (firstRow != null)
{
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
int startRow;
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 + 1;
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(i.ToString());
data.Columns.Add(column);
}
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);
}
ds.Tables.Add(data);
}
}
}
return ds;
}
/// <summary>
/// 将DataSet中的数据导入到excel中
/// </summary>
/// <param name="dt">DataTable</param>
/// <param name="path">文件路径</param>
public void DataSetToExcel(DataSet ds, string path)
{
IWorkbook workbook = GetWorkbook(path);
for (int d = 0; d < ds.Tables.Count; d++)
{
DataTable dt = ds.Tables[d];
ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("Sheet" + d) : workbook.CreateSheet(dt.TableName);//创建工作表
#region 标题
IRow row = sheet.CreateRow(0);//在工作表中添加一行
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);//在行中添加一列
cell.SetCellValue(dt.Columns[i].ColumnName);//设置列的内容
}
#endregion
#region 填充数据
for (int i = 1; i <= dt.Rows.Count; i++)//遍历DataTable行
{
DataRow dataRow = dt.Rows[i - 1];
row = sheet.CreateRow(i);//在工作表中添加一行
for (int j = 0; j < dt.Columns.Count; j++)//遍历DataTable列
{
ICell cell = row.CreateCell(j);//在行中添加一列
cell.SetCellValue(dataRow[j].ToString());//设置列的内容
}
}
}
#endregion
#region 输出Excel
MemoryStream ms = new MemoryStream();
workbook.Write(ms);
using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write))
{
byte[] bArr = ms.ToArray();
fs.Write(bArr, 0, bArr.Length);
fs.Flush();
}
#endregion
}
}
}
调用
DataSet ds = new DataSet();
DataTable md = new DataTable("table1");
DataTable mdtb = new DataTable("table2");
md.Columns.Add("ID", Type.GetType("System.String"));
md.Columns.Add("Name", Type.GetType("System.String"));
mdtb.Columns.Add("TableName", Type.GetType("System.String"));
mdtb.Columns.Add("ProductName", Type.GetType("System.String"));
DataRow newRow, mdtbRow;
newRow = md.NewRow();
newRow["ID"] = Guid.NewGuid().ToString();
newRow["Name"] = Guid.NewGuid().ToString();
md.Rows.Add(newRow);
mdtbRow = mdtb.NewRow();
mdtbRow["TableName"] = Guid.NewGuid().ToString();
mdtbRow["ProductName"] = Guid.NewGuid().ToString();
mdtb.Rows.Add(mdtbRow);
ds.Tables.Add(md);
ds.Tables.Add(mdtb);
var excelPath = Path.Combine(Environment.CurrentDirectory, $"{Guid.NewGuid()}.xlsx");
new ExcelHelper().DataSetToExcel(ds, excelPath);
