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导出excel我用的是nuget 的NPOI，直接在项目中添加的，引用到项目中，下面是截图：
下面我把ExcelHelper贴出来
public static class ExcelHelper
{
public static void ExportToExcel(DataTable dt)
{
ExportToExcelData(dt);
}
public static DataTable ToDataTable(this DataGridView myDGV)
{
DataTable dt = new DataTable();
for (int i = 0; i < myDGV.ColumnCount; i++)
{
dt.Columns.Add(myDGV.Columns[i].HeaderText);
}
//写入数值
for (int r = 0; r < myDGV.Rows.Count; r++)
{
List<object> values = new List<object>();
for (int i = 0; i < myDGV.ColumnCount; i++)
{
values.Add(myDGV.Rows[r].Cells[i].Value);
}
dt.Rows.Add(values .ToArray());
}
return dt;
}
#region 导出
/// <summary>
/// 数据导出
/// </summary>
/// <param name="data"></param>
/// <param name="sheetName"></param>
public static void ExportToExcelData(this DataTable data)
{
ExportToExcel(data, "Sheet1");
}
/// <summary>
/// 数据导出
/// </summary>
/// <param name="data"></param>
/// <param name="sheetName"></param>
public static void ExportToExcel(this DataTable data, string sheetName)
{
SaveFileDialog fileDialog = new SaveFileDialog();
//fileDialog.Filter = "Excel(97-2003)|*.xls|Excel(2007-2013)|*.xlsx";
fileDialog.Filter = "Excel|*.xls|Excel|*.xlsx";
if (fileDialog.ShowDialog() == System.Windows.Forms.DialogResult.Cancel)
{
return;
}
IWorkbook workbook = new XSSFWorkbook();
ISheet sheet = workbook.CreateSheet(sheetName);
IRow rowHead = sheet.CreateRow(0);
//填写表头
for (int i = 0; i < data.Columns.Count; i++)
{
rowHead.CreateCell(i, CellType.String).SetCellValue(data.Columns[i].ColumnName.ToString());
}
//填写内容
for (int i = 0; i < data.Rows.Count; i++)
{
IRow row = sheet.CreateRow(i + 1);
for (int j = 0; j < data.Columns.Count; j++)
{
row.CreateCell(j, CellType.String).SetCellValue(data.Rows[i][j].ToString());
}
}
for (int i = 0; i < data.Columns.Count; i++)
{
sheet.AutoSizeColumn(i);
}
using (FileStream stream = File.OpenWrite(fileDialog.FileName))
{
workbook.Write(stream);
stream.Close();
}
MessageBox.Show("导出数据成功!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
GC.Collect();
}
#endregion
#region 导入
/// <summary>
/// 导入的文件名
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public static DataSet ExcelToDataSet(string fileName)
{
return ExcelToDataSet(fileName, true);
}
/// <summary>
/// 返回dataset
/// </summary>
/// <param name="fileName"></param>
/// <param name="firstRowAsHeader"></param>
/// <returns></returns>
public static DataSet ExcelToDataSet(string fileName, bool firstRowAsHeader)
{
int sheetCount = 0;
return ExcelToDataSet(fileName, firstRowAsHeader, out sheetCount);
}
/// <summary>
/// 返回dataset
/// </summary>
/// <param name="fileName">文件名</param>
/// <param name="firstRowAsHeader">文件头</param>
/// <param name="sheetCount">内容</param>
/// <returns></returns>
public static DataSet ExcelToDataSet(string fileName, bool firstRowAsHeader, out int sheetCount)
{
using (DataSet ds = new DataSet())
{
using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
{
IWorkbook workbook = WorkbookFactory.Create(fileStream);
IFormulaEvaluator evaluator = WorkbookFactory.CreateFormulaEvaluator(workbook);
sheetCount = workbook.NumberOfSheets;
for (int i = 0; i < sheetCount; ++i)
{
ISheet sheet = workbook.GetSheetAt(i);
DataTable dt = ExcelToDataTable(sheet, evaluator, firstRowAsHeader);
ds.Tables.Add(dt);
}
return ds;
}
}
}
/// <summary>
/// 返回DataTable
/// </summary>
/// <param name="sheet"></param>
/// <param name="evaluator"></param>
/// <param name="firstRowAsHeader"></param>
/// <returns></returns>
private static DataTable ExcelToDataTable(ISheet sheet, IFormulaEvaluator evaluator, bool firstRowAsHeader)
{
if (firstRowAsHeader)
{
return ExcelToDataTableFirstRowAsHeader(sheet, evaluator);
}
else
{
return ExcelToDataTable(sheet, evaluator);
}
}
private static DataTable ExcelToDataTableFirstRowAsHeader(ISheet sheet, IFormulaEvaluator evaluator)
{
try
{
using (DataTable dt = new DataTable())
{
IRow firstRow = sheet.GetRow(0);
int cellCount = GetCellCount(sheet);
for (int i = 0; i < cellCount; i++)
{
if (firstRow.GetCell(i) != null)
{
dt.Columns.Add(firstRow.GetCell(i).StringCellValue ?? string.Format("F{0}", i + 1), typeof(string));
}
else
{
dt.Columns.Add(string.Format("F{0}", i + 1), typeof(string));
}
}
for (int i = 1; i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
DataRow dr = dt.NewRow();
FillDataRowByRow(row, evaluator, ref dr);
dt.Rows.Add(dr);
}
dt.TableName = sheet.SheetName;
return dt;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return null;
}
}
private static DataTable ExcelToDataTable(ISheet sheet, IFormulaEvaluator evaluator)
{
using (DataTable dt = new DataTable())
{
if (sheet.LastRowNum != 0)
{
int cellCount = GetCellCount(sheet);
for (int i = 0; i < cellCount; i++)
{
dt.Columns.Add(string.Format("F{0}", i), typeof(string));
}
for (int i = 0; i < sheet.FirstRowNum; ++i)
{
DataRow dr = dt.NewRow();
dt.Rows.Add(dr);
}
for (int i = sheet.FirstRowNum; i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
DataRow dr = dt.NewRow();
FillDataRowByRow(row, evaluator, ref dr);
dt.Rows.Add(dr);
}
}
dt.TableName = sheet.SheetName;
return dt;
}
}
/// <summary>
/// 填充数据
/// </summary>
/// <param name="row"></param>
/// <param name="evaluator"></param>
/// <param name="dr"></param>
private static void FillDataRowByRow(IRow row, IFormulaEvaluator evaluator, ref DataRow dr)
{
if (row != null)
{
for (int j = 0; j < dr.Table.Columns.Count; j++)
{
ICell cell = row.GetCell(j);
if (cell != null)
{
switch (cell.CellType)
{
case CellType.Blank:
{
dr[j] = DBNull.Value;
break;
}
case CellType.Boolean:
{
dr[j] = cell.BooleanCellValue;
break;
}
case CellType.Numeric:
{
if (DateUtil.IsCellDateFormatted(cell))
{
dr[j] = cell.DateCellValue;
}
else
{
dr[j] = cell.NumericCellValue;
}
break;
}
case CellType.String:
{
dr[j] = cell.StringCellValue;
break;
}
case CellType.Error:
{
dr[j] = cell.ErrorCellValue;
break;
}
case CellType.Formula:
{
cell = evaluator.EvaluateInCell(cell) as HSSFCell;
dr[j] = cell.ToString();
break;
}
default:
throw new NotSupportedException(string.Format("Unsupported format type:{0}", cell.CellType));
}
}
}
}
}
/// <summary>
/// 获取单元格
/// </summary>
/// <param name="sheet"></param>
/// <returns></returns>
private static int GetCellCount(ISheet sheet)
{
int firstRowNum = sheet.FirstRowNum;
int cellCount = 0;
for (int i = sheet.FirstRowNum; i <= sheet.LastRowNum; ++i)
{
IRow row = sheet.GetRow(i);
if (row != null && row.LastCellNum > cellCount)
{
cellCount = row.LastCellNum;
}
}
return cellCount;
}
#endregion
}
如果DataGridview的数据源有多余的列，我们可以用扩展方法，把dataGridView转成DataTable，ExcelHelper中有，但是我拿出来，需要自己注意下。
/// <summary>
/// DataGridView转DataTable的扩展方法
/// </summary>
/// <param name="myDGV"></param>
/// <returns></returns>
public static DataTable ToDataTable(this DataGridView myDGV)
{
DataTable dt = new DataTable();
for (int i = 0; i < myDGV.ColumnCount; i++)
{
dt.Columns.Add(myDGV.Columns[i].HeaderText);
}
//写入数值
for (int r = 0; r < myDGV.Rows.Count; r++)
{
List<object> values = new List<object>();
for (int i = 0; i < myDGV.ColumnCount; i++)
{
values.Add(myDGV.Rows[r].Cells[i].Value);
}
dt.Rows.Add(values .ToArray());
}
return dt;
}
#endregion
导出按钮事件，可以直接写：
if (dgBoxInData.Rows.Count > 0)
{
ExcelHelper.ExportToExcel(dgBoxInData.ToDataTable());//Run
}
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