C#將dataGridView中顯示的資料匯出到Excel(大資料量超實用版)
阿新 • • 發佈:2019-01-03
開發中很多情況下需要將dataGridView控制元件中顯示的資料結果以Excel或者Word的形式匯出來,本例就來實現這個功能。由於從資料庫中查找出某些資料列可能沒必要顯示出來,在dataGridView中將對應的列隱藏了,這時匯出時就會將隱藏的列匯出來,顯然不是我們所預期的。做法是先將dataGridView中顯示的部分存進DataTable,然後就DataTable匯出到Excel,程式碼如下:
第一步:新增Excel引用
第二步:建立類
第三步:呼叫using System; using System.Collections; using System.Text; using System.Data; using System.Threading; using System.Windows.Forms; using System.Collections.Generic; using Microsoft.Office.Core; using Excel = Microsoft.Office.Interop.Excel; public class ExportToExcel { public Excel.Application m_xlApp = null; public void OutputAsExcelFile(DataGridView dataGridView) { if (dataGridView.Rows.Count <= 0) { MessageBox.Show("無資料!","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning); return; } string filePath=""; SaveFileDialog s = new SaveFileDialog(); s.Title = "儲存Excel檔案"; s.Filter = "Excel檔案(*.xls)|*.xls"; s.FilterIndex = 1; if (s.ShowDialog() == DialogResult.OK) filePath = s.FileName; else return; //第一步:將dataGridView轉化為dataTable,這樣可以過濾掉dataGridView中的隱藏列 DataTable tmpDataTable = new DataTable("tmpDataTable"); DataTable modelTable = new DataTable("ModelTable"); for (int column = 0; column < dataGridView.Columns.Count; column++) { if (dataGridView.Columns[column].Visible == true) { DataColumn tempColumn = new DataColumn(dataGridView.Columns[column].HeaderText, typeof(string)); tmpDataTable.Columns.Add(tempColumn); DataColumn modelColumn = new DataColumn(dataGridView.Columns[column].Name, typeof(string)); modelTable.Columns.Add(modelColumn); } } for (int row = 0; row < dataGridView.Rows.Count; row++) { if (dataGridView.Rows[row].Visible == false) continue; DataRow tempRow = tmpDataTable.NewRow(); for (int i = 0; i < tmpDataTable.Columns.Count; i++) tempRow[i] = dataGridView.Rows[row].Cells[modelTable.Columns[i].ColumnName].Value; tmpDataTable.Rows.Add(tempRow); } if (tmpDataTable == null) { return; } //第二步:匯出dataTable到Excel long rowNum = tmpDataTable.Rows.Count;//行數 int columnNum = tmpDataTable.Columns.Count;//列數 Excel.Application m_xlApp = new Excel.Application(); m_xlApp.DisplayAlerts = false;//不顯示更改提示 m_xlApp.Visible = false; Excel.Workbooks workbooks = m_xlApp.Workbooks; Excel.Workbook workbook = workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet); Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Worksheets[1];//取得sheet1 try { string[,] datas = new string[rowNum + 1, columnNum]; for (int i = 0; i < columnNum; i++) //寫入欄位 datas[0, i] = tmpDataTable.Columns[i].Caption; //Excel.Range range = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[1, columnNum]); Excel.Range range = m_xlApp.Range[worksheet.Cells[1, 1], worksheet.Cells[1, columnNum]]; range.Interior.ColorIndex = 15;//15代表灰色 range.Font.Bold = true; range.Font.Size = 10; int r = 0; for (r = 0; r < rowNum; r++) { for (int i = 0; i < columnNum; i++) { object obj = tmpDataTable.Rows[r][tmpDataTable.Columns[i].ToString()]; datas[r + 1, i] = obj == null ? "" : "'" + obj.ToString().Trim();//在obj.ToString()前加單引號是為了防止自動轉化格式 } System.Windows.Forms.Application.DoEvents(); //新增進度條 } //Excel.Range fchR = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]); Excel.Range fchR = m_xlApp.Range[worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]]; fchR.Value2 = datas; worksheet.Columns.EntireColumn.AutoFit();//列寬自適應。 //worksheet.Name = "dd"; //m_xlApp.WindowState = Excel.XlWindowState.xlMaximized; m_xlApp.Visible = false; // = worksheet.get_Range(worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]); range = m_xlApp.Range[worksheet.Cells[1, 1], worksheet.Cells[rowNum + 1, columnNum]]; //range.Interior.ColorIndex = 15;//15代表灰色 range.Font.Size = 9; range.RowHeight = 14.25; range.Borders.LineStyle = 1; range.HorizontalAlignment = 1; workbook.Saved = true; workbook.SaveCopyAs(filePath); } catch (Exception ex) { MessageBox.Show("匯出異常:" + ex.Message, "匯出異常", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { EndReport(); } m_xlApp.Workbooks.Close(); m_xlApp.Workbooks.Application.Quit(); m_xlApp.Application.Quit(); m_xlApp.Quit(); MessageBox.Show("匯出成功!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } private void EndReport() { object missing = System.Reflection.Missing.Value; try { //m_xlApp.Workbooks.Close(); //m_xlApp.Workbooks.Application.Quit(); //m_xlApp.Application.Quit(); //m_xlApp.Quit(); } catch { } finally { try { System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp.Workbooks); System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp.Application); System.Runtime.InteropServices.Marshal.ReleaseComObject(m_xlApp); m_xlApp = null; } catch { } try { //清理垃圾程序 this.killProcessThread(); } catch { } GC.Collect(); } } private void killProcessThread() { ArrayList myProcess = new ArrayList(); for (int i = 0; i < myProcess.Count; i++) { try { System.Diagnostics.Process.GetProcessById(int.Parse((string)myProcess[i])).Kill(); } catch { } } } }
ExportToExcel d = new ExportToExcel();
d.OutputAsExcelFile(dataGridView1);