DataTable Excel

这里是使用Microsoft.Office.Interop.Excel类进行Excel表格操作，核心代码就这些了。麻烦的是服务器上的一些关于access的权限配置。             

   string file = System.AppDomain.CurrentDomain.BaseDirectory + "对账单\\" + filename;



                if (ExcelHelper.DataTableToCSV(dt, file + System.Web.HttpContext.Current.Session["us_Name"] + ".csv", new string[] { "rowId" }))

                {

                    HttpResponse resp;

                    resp = System.Web.HttpContext.Current.Response;

                    resp.Clear();

                    resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");

                    resp.ContentType = "application/vnd.ms-excel";

                    resp.Charset = "GB2312";



                    resp.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename, Encoding.UTF8) + ".csv");

                    resp.WriteFile(file + System.Web.HttpContext.Current.Session["us_Name"] + ".csv");

                }

 

        public static bool DataTableToCSV(System.Data.DataTable excelTable, string filePath,string[] removeFileds)

        {



            Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.ApplicationClass();

            app.Visible = false;



            Workbooks workBooks = app.Workbooks; //创建Excel工作簿

            Workbook wBook = workBooks.Add(XlWBATemplate.xlWBATWorksheet);



            Worksheet wSheet = wBook.Worksheets[1] as Worksheet;



            foreach (string item in removeFileds)

            {

                if (excelTable.Columns.Contains(item))

                {

                    excelTable.Columns.Remove(item);

                }

            }



            try

            {





                if (excelTable.Rows.Count > 0)

                {

                    int row = 0;

                    row = excelTable.Rows.Count;

                    int col = excelTable.Columns.Count;



                    //关键性代码，直接关系到性能问题

　　　　　　　　　　　　Array arr = Array.CreateInstance(typeof(String), row, col);



                    for (int i = 0; i < row; i++)

                    {



                        for (int j = 0; j < col; j++)

                        {



                            arr.SetValue(excelTable.Rows[i][j].ToString(), i, j);



                        }



                    }



                    Microsoft.Office.Interop.Excel.Range range = wSheet.get_Range(wSheet.Cells[2, 1], wSheet.Cells[row + 1, col]);

                    range.Value2 = arr; 

                }



                int size = excelTable.Columns.Count;

                for (int k = 0; k < size; k++)

                {



                    wSheet.Cells[1, 1 + k] = excelTable.Columns[k].ColumnName;

                    Range xlsRang = (Range)wSheet.Cells[1, 1 + k];

                    xlsRang.EntireColumn.AutoFit();

                }



                //设置禁止弹出保存和覆盖的询问提示框   

                app.DisplayAlerts = false;

                app.AlertBeforeOverwriting = false;

                //保存工作簿   



                wBook.Save();

                wBook.SaveCopyAs(filePath); //自定义保存的文件名称



            }

            catch (Exception err)

            {

                return false;

            }

            finally

            {



                workBooks.Close(); //关闭工作簿

                if (app != null)

                {

                    app.Workbooks.Close();

                    app.Quit(); //退出Excel

                    int intGenerate = System.GC.GetGeneration(app);

                    System.Runtime.InteropServices.Marshal.ReleaseComObject(app); //将XLSAPP从内存托管堆中移除

                    app = null;

                    System.GC.Collect(intGenerate);

                }

                GC.Collect(); //强行退出Excel

                app = null;



            }



            return true;

        }