如何适用c#将大量字符串导入excel
1、/// <summary> /// 导出速度最快 /// </summary> /// <param name="list"><列名，数据></param> /// <param name="filepath"></param> /// <returns></returns> public bool NewExport(List<DictionaryEntry> list, string filepath) { bool bSuccess = true; Microsoft.Office.Interop.Excel.Application appexcel = new Microsoft.Office.Interop.Excel.Application(); System.Reflection.Missing miss = System.Reflection.Missing.Value; appexcel = new Microsoft.Office.Interop.Excel.Application(); Microsoft.Office.Interop.Excel.Workbook workbookdata = null; Microsoft.Office.Interop.Excel.Worksheet worksheetdata = null; Microsoft.Office.Interop.Excel.Range rangedata; workbookdata = appexcel.Workbooks.Add();
2、//设置对象不可见 appexcel.Visible = false; appexcel.DisplayAlerts = false; try { foreach (var lv in list) { var keys = lv.Key as List<string>; var values = lv.Value as List<IList<object>>; worksheetdata = (Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets.Add(miss, workbookdata.ActiveSheet); for (int i = 0; i < keys.Count-1; i++) { //给工作表赋名称 worksheetdata.Name = keys[0];//列名的第一个数据位表名 worksheetdata.Cells[1, i + 1] = keys[i+1]; } //因为第一行已经写了表头，所以所有数据都应该从a2开始 rangedata = worksheetdata.get_Range("a2", miss); Microsoft.Office.Interop.Excel.Range xlrang = null; //irowcount为实际行数，最大行 int irowcount = values.Count; int iparstedrow = 0, icurrsize = 0; //ieachsize为每次写行的数值，可以自己设置 int ieachsize = 10000; //icolumnaccount为实际列数，最大列数 int icolumnaccount = keys.Count-1; //在内存中声明一个ieachsize×icolumnaccount的数组，ieachsize是每次最大存储的行数，icolumnaccount就是存储的实际列数 object[,] objval = new object[ieachsize, icolumnaccount]; icurrsize = ieachsize; while (iparstedrow < irowcount) { if ((irowcount - iparstedrow) < ieachsize) icurrsize = irowcount - iparstedrow; //用for循环给数组赋值 for (int i = 0; i < icurrsize; i++)
3、 { for (int j = 0; j < icolumnaccount; j++) { var v = values[i + iparstedrow][j]; objval[i, j] = v != null ? v.ToString() : ""; } } string X = "A" + ((int)(iparstedrow + 2)).ToString(); string col = ""; if (icolumnaccount <= 26) { col = ((char)('A' + icolumnaccount - 1)).ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString(); } else { col = ((char)('A' + (icolumnaccount / 26 - 1))).ToString() + ((char)('A' + (icolumnaccount % 26 - 1))).ToString() + ((int)(iparstedrow + icurrsize + 1)).ToString(); } xlrang = worksheetdata.get_Range(X, col); xlrang.NumberFormat = "@"; // 调用range的value2属性，把内存中的值赋给excel xlrang.Value2 = objval; iparstedrow = iparstedrow + icurrsize; } } ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet1"]).Delete();
4、 ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet2"]).Delete(); ((Microsoft.Office.Interop.Excel.Worksheet)workbookdata.Worksheets["Sheet3"]).Delete(); //保存工作表 workbookdata.SaveAs(filepath, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss); workbookdata.Close(false, miss, miss); appexcel.Workbooks.Close(); appexcel.Quit();
5、 System.Runtime.InteropServices.Marshal.ReleaseComObject(workbookdata); System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel.Workbooks); System.Runtime.InteropServices.Marshal.ReleaseComObject(appexcel);
6、 GC.Collect(); } catch (Exception ex) { ErrorMsg = ex.Message; bSuccess = false; } finally { if (appexcel != null) { ExcelImportHelper.KillSpecialExcel(appexcel); } } return bSuccess; }
range.NumberFormatLocal = "@"; //设置单元格格式为文本
