c# Aes加解密和对象序列化

aes加解密

public class AesCryptto
    {
        private string key = "hjyf57468jhmuist";
        private string iv = "ud547io0d98eddl2d";

        /// <summary>
        /// aes加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public string Encrpty(string str)
        {
            try
            {
                AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
                aes.Key = Encoding.UTF8.GetBytes(key);
                aes.IV = Encoding.UTF8.GetBytes(iv);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.Zeros;

                MemoryStream memory = new MemoryStream();

                using (CryptoStream stream = new CryptoStream(memory, aes.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    byte[] buffer = Encoding.UTF8.GetBytes(str);
                    stream.Write(buffer, , buffer.Length);
                    stream.FlushFinalBlock();
                }

                string result = Convert.ToBase64String(memory.ToArray());

                //对url参数进行编码，会把"/"等转码
                result = Uri.EscapeDataString(result);

                //对url地址进行编码，不会对"/"编码，对空格和中文编码
                //result = Uri.EscapeDataString(result);

                return result;
            }
            catch
            {
                return str;
            }
        }

        /// <summary>
        /// aes解密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public string DeEncrpty(string str)
        {
            try
            {
                AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
                aes.Key = Encoding.UTF8.GetBytes(key);
                aes.IV = Encoding.UTF8.GetBytes(iv);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.Zeros;

                str = Uri.UnescapeDataString(str);
                byte[] buffer = Convert.FromBase64String(str);
                MemoryStream memory = new MemoryStream(buffer);

                using (CryptoStream stream = new CryptoStream(memory, aes.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    stream.Write(buffer, , buffer.Length);
                    stream.FlushFinalBlock();

                }

                return Encoding.UTF8.GetString(memory.ToArray());
            }
            catch
            {
                return str;
            }
        }
    }

对象序列化

public class SerializeHelper
    {
        /// <summary>
        /// 把对象序列化为字符串
        /// </summary>
        /// <param name="user"></param>
        /// <returns></returns>
        public string Serialize<T>(T entity)
        {
            try
            {
                BinaryFormatter formatter = new BinaryFormatter();

                MemoryStream memory = new MemoryStream();

                formatter.Serialize(memory, entity);

                return Encoding.Default.GetString(memory.ToArray());
            }
            catch
            {
                return "";
            }
        }

        /// <summary>
        /// 将序列化后的字符串反序列化为对象
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public T DeSerialize<T>(string str)
        {
            try
            {
                BinaryFormatter formatter = new BinaryFormatter();
                MemoryStream memory = new MemoryStream(Encoding.Default.GetBytes(str));

                return (T)formatter.Deserialize(memory);
            }
            catch
            {
                return default(T);
            }
        }
    }

对象序列化时，必须在类前面加上[Serializable()]，想让某个字段不可序列化时，需要在该字段前加上[NonSerialized()]，对属性无效。

[Serializable()]
    public class User
    {
        public string LoginName { get; set; }

        public string Password { get; set; }

        [NonSerialized()]
        private DateTime regTime;

        public DateTime RegTime
        {
            get { return regTime; }
            set { regTime = value; }
        }
    }

这两个功能一起使用时可以用来在cookie中存储登陆信息等。