C#根據當前DataGridView查詢數據導出Excel

        private void btnsuggestinfo_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("單號", typeof(string));
            dt.Columns.Add("項次", typeof(decimal));
            dt.Columns.Add("項次預約數量", typeof(decimal));
            dt.Columns.Add("廠別", typeof(string));
            dt.Columns.Add("料號", typeof(string));
            dt.Columns.Add("倉碼", typeof(string));
            dt.Columns.Add("BATCH", typeof(string));          
            dt.Columns.Add("棧板", typeof(string));
            dt.Columns.Add("入庫日期", typeof(string));// add by chao 
            dt.Columns.Add("儲位", typeof(string));
            dt.Columns.Add("數量", typeof(decimal));

            foreach (DataGridViewRow dgvr in dgvdnitem.Rows)
            {
                var docitem = dgvr.DataBoundItem as Wms_doc_item;

                var stockpallets = WmsEntity.Select<Wms_stock_pallet_v>(x => x.PLANT == docitem.PLANT_FROM &
                   x.SLOC == docitem.SLOC_FROM & x.MATERIAL == docitem.MATERIAL &x.BATCH==docitem.BATCH&
                   x.STOCK_FLAG == (int)Step_Type.None & x.LOCK_FLAG == 0 & x.WH == Basic.WorkingWH).OrderBy(x => x.IN_DATE);

                decimal? remain_qty = (decimal?)(docitem.REQUEST_QTY - docitem.OPERATION_QTY - docitem.RESERVED_QTY);

                foreach (var pallet in stockpallets)
                {
                    DataRow dr = dt.NewRow();
                    dr.SetField<string>("單號", docitem.DOC_NO);
                    dr.SetField<decimal>("項次", docitem.DOC_ITEM.Value);
                    dr.SetField<decimal>("項次預約數量", docitem.REQUEST_QTY.Value);
                    dr.SetField<string>("廠別", pallet.PLANT);
                    dr.SetField<string>("料號", pallet.MATERIAL);
                    dr.SetField<string>("倉碼", pallet.SLOC);
                    dr.SetField<string>("BATCH", docitem.BATCH);
                    dr.SetField<string>("棧板", pallet.PALLET_ID);
                    dr.SetField<string>("入庫日期",pallet.IN_DATE.ToString());// add by chao 
                    dr.SetField<string>("儲位", pallet.BIN);
                    dr.SetField<decimal>("數量", pallet.PANEL_QTY.Value);
                    dt.Rows.Add(dr);

                    remain_qty -= pallet.PANEL_QTY;
                    if (remain_qty <= 0)
                    {
                        break;
                    }
                }
            }
            DataTableToExcel(dt);
        }
        public static void DataTableToExcel(DataTable table)
        {
            SaveFileDialog dlg = new SaveFileDialog();
            dlg.Filter = "Execl files (*.xls)|*.xls";
            dlg.FilterIndex = 0;
            dlg.RestoreDirectory = true;
            dlg.Title = "保存為Excel文件";

            if (dlg.ShowDialog() == DialogResult.OK)
            {
                Stream myStream;
                myStream = dlg.OpenFile();
                StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.Default);
                string columnTitle = "";
                try
                {
                    //寫入標題列 
                    for (int i = 0; i < table.Columns.Count; i++)
                    {
                        if (columnTitle == "")
                        {
                            columnTitle = """ + table.Columns[i].ColumnName + """;
                        }
                        else
                        {
                            columnTitle += "	" + """ + table.Columns[i].ColumnName + """;
                        }
                    }
                    sw.WriteLine(columnTitle);

                    //寫入內容列  
                    for (int j = 0; j < table.Rows.Count; j++)
                    {
                        string columnValue = "";
                        for (int i = 0; i < table.Columns.Count; i++)
                        {
                            string cellValue = table.Rows[j][i] == DBNull.Value ? "" : table.Rows[j][i].ToString().Replace(""", "'");
                            if (columnValue == "")
                            {
                                columnValue = """ + cellValue + """;
                            }
                            else
                            {
                                columnValue += "	" + """ + cellValue + """;
                            }
                        }
                        sw.WriteLine(columnValue);
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
                finally
                {
                    sw.Close();
                    myStream.Close();
                }
            }
        }