frmmain.cs

这是可以加密&解密字符串

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using GTT;

namespace EncryptDecrypt
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (dlgOpenLicense.ShowDialog() == DialogResult.OK)
            {
                EncryptedLicenseProvider licenseProvider = new EncryptedLicenseProvider();
                licenseProvider.Key = this.txbkey.Text;
                ServerLicense license = (ServerLicense)licenseProvider.LoadLicense(dlgOpenLicense.FileName);
                if (license == null)
                {
                    MessageBox.Show("Can not get license, may be your key is invalid.");
                    return;
                }
                this.dtpStartTime.Value = new DateTime(license.StartTicks);
                this.dtpEndTime.Value = new DateTime(license.EndTicks);
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            if (dlgSaveLicense.ShowDialog() == DialogResult.OK)
            {
                EncryptedLicenseProvider licenseProvider = new EncryptedLicenseProvider();
                licenseProvider.Key = this.txbkey.Text;
                ServerLicense license = new ServerLicense(this.dtpStartTime.Value.Ticks, this.dtpEndTime.Value.Ticks);
                licenseProvider.SaveLicense(dlgSaveLicense.FileName, license);
            }
        }
    }
}