c#写入注册表，读取注册表。使用二进制数据

c#写入

private void button4_Click(object sender, EventArgs e)
        {
            try
            {
                RegistryKey a = Registry.LocalMachine;
                RegistryKey b = a.OpenSubKey("SOFTWARE",true);
                RegistryKey c = b.CreateSubKey("dsoa\\regdate", RegistryKeyPermissionCheck.ReadWriteSubTree);
                c.SetValue("date", charToBinary(System.DateTime.Now.ToShortDateString()), RegistryValueKind.Binary);
               
            }
            catch (Exception eq)
            {
                MessageBox.Show(eq.ToString());
            }
        }

        #region 把字符串转化为二进制
        private byte[] charToBinary(string str)
        {
            ASCIIEncoding encoding = new ASCIIEncoding();
            byte[] tag = encoding.GetBytes(str);
            return tag;
        }
        #endregion

读取

 try
            {
                RegistryKey regkey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\dsoa\regdate");

                string value = ConvertBytes((byte[])regkey.GetValue("date"));
                DateTime dt1 = Convert.ToDateTime(value);
                System.TimeSpan dayspan = System.DateTime.Today - dt1;
                BLL.Login login=new OASolution.BLL.Login();
                if (dayspan.Days >= 31 || login.GetCurrentIsExpire() == false)
                {
                    Page.Response.Redirect("end.htm",false);
                              }

            }
            catch (Exception eq)
            {
                Page.Response.Redirect("instalerror.htm", false);
           
            }

 #region 由字节转化为字符串
        private string ConvertBytes(byte[] data)
        {
            ASCIIEncoding encoding = new ASCIIEncoding();
            Char[] dataChars = encoding.GetChars(data);

            // 使用StringBuilder来转化成字符串
            StringBuilder builder = new StringBuilder();
            builder.Append(dataChars);

            // 得到字符串
            string dataString = builder.ToString();

            // 提取左右两边的空格
            dataString = dataString.Trim();
            // 返回
            return dataString;

        }
        #endregion

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