MemberManagement/FrmRecharge.cs

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using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using NPOI.OpenXml4Net.OPC;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MemberManagement
{
    public partial class FrmRecharge : Form
    {
        private member Member;
        private decimal RechargeValue = 0;
        private string PrinterName = "";
        private string config = Application.StartupPath + @"\config.json";
        public FrmRecharge()
        {
            InitializeComponent();
            this.GetPrinterName();
        }

        private void FrmRecharge_Load(object sender, EventArgs e)
        {
            this.txtCard1.Focus();
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            ((Button)sender).Enabled = false;
            this.RechargeValue = this.nudRecharge.Value;
            if (this.UpdateMember())
            {
                MessageBox.Show("充值成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                this.GetMember(this.txtCard1.Text.Trim());
                this.nudRecharge.Value = 0;
                this.printDocument1.PrinterSettings.PrinterName = this.PrinterName;
                this.printDocument1.Print();
            }
            ((Button)sender).Enabled = true;
        }

        private bool UpdateMember()
        {
            try
            {
                using (var db = new MemberManagementEntities())
                {
                    var m = db.member.FirstOrDefault(o => o.cardNumber == this.txtCard1.Text.Trim());
                    m.balance += this.nudRecharge.Value;
                    db.recharge.Add(new recharge()
                    {
                        memberId = m.id,
                        type = 0,