C# 小票打印

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using SLDESS.Helper;
using System.Drawing.Printing;

namespace zc_pos_client
{
    public class pos_printer
    {
        public string header_ = frmSystemSet.get_value（frmSystemSet.key_title_ “中储万能POS“）;
        public string foot_ = frmSystemSet.get_value（frmSystemSet.key_foot_ ““）;
        public string saild_id_ = “201210220001“;
        public string date_ = DateTime.Now.ToString（）;
        public List> datas_ = new List>（）;

        public string num_ = “5“;
        public string total_ = “0.00“;

        public string discount_ = “5.00“;
        public string amount_ = “43.00“; // 应收金额
        public string recv_cash_ = “45.00“;  // 收款金额
        public string ret_cash = “2.00“; // 找零金额

        public string card_no_ = “350104198311155470“; // 会员卡号
        public string mark_in_ = “43“; // 本次积分
        public string mark_available_  = “5000“; // 可用积分
        public string car_use_ = “0.00“; // 卡 消 费
        public string car_available_ = “300.00“; // 可用余额

        private System.Windows.Forms.PrintPreviewDialog printv_pos = null;
        private System.Drawing.Printing.PrintDocument printd_pos = null;

        public pos_printer（）
        {
            this.printv_pos = new System.Windows.Forms.PrintPreviewDialog（）;
            this.printd_pos = new System.Drawing.Printing.PrintDocument（）;


            this.printv_pos.AutoScrollMargin = new System.Drawing.Size（0 0）;
            this.printv_pos.AutoScrollMinSize = new System.Drawing.Size（0 0）;
            this.printv_pos.ClientSize = new System.Drawing.Size（400 300）;
            this.printv_pos.Document = this.printd_pos;
            this.printv_pos.Enabled = true;
           // this.printv_pos.Icon = （（System.Drawing.Icon）（resources.Getobject（“printv_pos.Icon“）））;
            this.printv_pos.Name = “printPreviewDialog1“;
            this.printv_pos.Visible = false;
            // 
            // printd_pos
            // 
            this.printd_pos.DocumentName = “中储POS小票“;
            this.printd_pos.OriginAtMargins = true;
            this.printd_pos.PrintPage += new System.Drawing.Printing.PrintPageEventHandler（this.printd_pos_PrintPage）;


           datas_.Clear（）;

           for （int i = 0; i < 5; i++）
           {
                List item1 = new List（）;
                this.datas_.Add（item1）;
                item1.Add（“商品名称“）;
                item1.Add（“6913027817039“）; 
                item1.Add（“1.0“）;
                item1.Add（“25.00“）;
                item1.Add（“25.00“）;
           }
        }

        private int getYc（double cm）
        {
            return （int）（cm / 25.4） * 100;
        }

        public string GetPrintStr（）
        {
            StringBuilder sb = new StringBuilder（）