Epplus导出错误是这样的：'System.Data.DataSet'对象types'System.Data.DataTable'不是实物。

我想转换一个GridView到.xls，但它会抛出错误，当我点击确定它给我“无法导出到Excel。原始错误：'System.Data.DataSet'对象types'System.Data.DataTable'没有采取善良。“这是我的代码;

我的searchbutton

groupBox2.Visible = true; SqlConnection baglanti = new SqlConnection("Data Source=.; Initial Catalog=database; Trusted_Connection=yes; MultipleActiveResultSets=True"); SqlDataAdapter da = new SqlDataAdapter(); SqlCommand cmd = new SqlCommand(); DataSet ds = new DataSet(); baglanti.Open(); cmd.CommandText = "SELECT * FROM hostes_tablo WHERE ayak_no=" + comboBox7.Text + ""; da.SelectCommand = cmd; cmd.Connection = baglanti; da.Fill(ds, "hostes_tablo"); dataGridView1.DataSource = ds; dataGridView1.DataMember = "hostes_tablo"; baglanti.Close(); 

我的导出button

 var saveFileDialog1 = new SaveFileDialog(); saveFileDialog1.Filter = "Excel File (*.xlsx)|*.xlsx"; saveFileDialog1.FilterIndex = 1; if (saveFileDialog1.ShowDialog() == DialogResult.OK) { try { FileInfo file = new FileInfo(saveFileDialog1.FileName); if (file.Exists) { file.Delete(); } using (ExcelPackage pck = new ExcelPackage(file)) { ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Sheet1"); ws.Cells["A1"].LoadFromDataTable(((DataTable)dataGridView1.DataSource), true); ws.Cells.AutoFitColumns(); using (ExcelRange rng = ws.Cells[1, 1, 1, dataGridView1.Columns.Count]) { rng.Style.Font.Bold = true; rng.Style.Fill.PatternType = ExcelFillStyle.Solid; rng.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.FromArgb(79, 129, 189)); rng.Style.Font.Color.SetColor(System.Drawing.Color.White); } pck.Save(); pck.Dispose(); } MessageBox.Show(string.Format("Excel file \"{0}\" generated successfully.", file.Name)); } catch (Exception ex) { MessageBox.Show("Failed to export to Excel. Original error: " + ex.Message); } } 

我search然后当我点击导出button它给我错误。

Answer 1

我认为从DataSet到DataTable的投射给出了错误。 您不能直接将DataSet为DataTable 。

使用下面的代码来做到这一点。

 BindingSource bs = (BindingSource)dataGridView1.DataSource; DataTable dt= (DataTable) bs.DataSource; ws.Cells["A1"].LoadFromDataTable(dt, true); 

Answer 2

你是正确的，我从数据集转换为DataTable

  var saveFileDialog1 = new SaveFileDialog(); saveFileDialog1.Filter = "Excel Dosyası (*.xlsx)|*.xlsx"; saveFileDialog1.FilterIndex = 1; if (saveFileDialog1.ShowDialog() == DialogResult.OK) { try { DataSet ds = dataGridView1.DataSource as DataSet; if (ds != null) { DataTable tbl = ds.Tables["hostes_tablo"]; FileInfo file = new FileInfo(saveFileDialog1.FileName); if (file.Exists) { file.Delete(); } using (ExcelPackage pck = new ExcelPackage(file)) { ExcelWorksheet ws = pck.Workbook.Worksheets.Add("AjansRed Sorgu Sonuç"); ws.Cells["A1"].LoadFromDataTable(tbl, true); ws.Cells.AutoFitColumns(); ws.Cells[1,dataGridView1.Columns.Count+2].Value = label81.Text.ToString(); using (ExcelRange rng = ws.Cells[1, 1, 1, dataGridView1.Columns.Count+1])//ws.cells[from row, from column, to row, to column]. sayıların anlamı { rng.Style.Font.Bold = true; rng.Style.Fill.PatternType = ExcelFillStyle.Solid; rng.Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.FromArgb(79, 129, 189)); rng.Style.Font.Color.SetColor(System.Drawing.Color.White); } pck.Save(); pck.Dispose(); } MessageBox.Show(string.Format(@"Sorgu Sonucunuzu İçeren ""{0}"" Başarıyla Dışarıya Aktarıldı!", file.Name)); } } catch (Exception ex) { MessageBox.Show("Hata! Hata! Hata! Excel Dışarı Aktarma Esnasında Sorun Oluştu. Original error: " + ex.Message); } }