多表导出

   public void Export(DataSet ds)
        {

            using (ExcelPackage pck = new ExcelPackage())//创建文件
            {
                foreach (DataTable sourceTable in ds.Tables)
                {
                   
                    


                    //Create the worksheet
                    string sheetName = string.IsNullOrEmpty(sourceTable.TableName) ? "Sheet1" : sourceTable.TableName;
                    //1.创建sheet
                    ExcelWorksheet ws = pck.Workbook.Worksheets.Add(sheetName);
                    //填充数据
                    //Load the datatable into the sheet, starting from cell A1. Print the column names on row 1
                    ws.Cells["A1"].LoadFromDataTable(sourceTable, true);

                    //Format the row
                    ExcelBorderStyle borderStyle = ExcelBorderStyle.Thin;
                    Color borderColor = Color.FromArgb(155, 155, 155);

                    using (ExcelRange rng = ws.Cells[1, 1, sourceTable.Rows.Count + 1, sourceTable.Columns.Count])
                    {
                        rng.Style.Font.Name = "宋体";
                        rng.Style.Font.Size = 10;
                        rng.Style.Fill.PatternType = ExcelFillStyle.Solid;                      //Set Pattern for the background to Solid
                        rng.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(255, 255, 255));

                        rng.Style.Border.Top.Style = borderStyle;
                        rng.Style.Border.Top.Color.SetColor(borderColor);

                        rng.Style.Border.Bottom.Style = borderStyle;
                        rng.Style.Border.Bottom.Color.SetColor(borderColor);

                        rng.Style.Border.Right.Style = borderStyle;
                        rng.Style.Border.Right.Color.SetColor(borderColor);
                    }

                    //Format the header row
                    using (ExcelRange rng = ws.Cells[1, 1, 1, sourceTable.Columns.Count])
                    {
                        rng.Style.Font.Bold = true;
                        rng.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
                        rng.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(234, 241, 246));  //Set color to dark blue
                        rng.Style.Font.Color.SetColor(Color.FromArgb(51, 51, 51));
                    }



                }
                //导出Excel
                //Write it back to the client
                HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment;  filename={0}.xlsx", HttpUtility.UrlEncode("事件报告分类清单", Encoding.UTF8)));
                HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;

                HttpContext.Current.Response.BinaryWrite(pck.GetAsByteArray());
                HttpContext.Current.Response.End();
            }
        }