使用反射和Attribute动态显示代码中的注释内容

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WinForm WebForm Linq Security 算法

　　反射和Attribute是.NET的两种技术，可以应用在很多的地方。

　　反射可以反射类中的属性，方法，实现动态调用，也经常在三层工厂中使用，反射接口的实现。

　　Attribute，个人理解，就是一个特性，可以添加在任何自定义类型上面，然后添加一些注释，也是很有用的。

　　本篇就示例讲解一个他们的结合使用：使用反射和Attribute动态显示代码中的注释内容。其中也杂合它一些其他的内容，一个是前几天写的一个C#的加密解密算法，包括Silverlight的MD5算法。还有就是一个商品规格的计算方法，比如给出需要购买的总量，然后计算每种规格需要购买的数量，和总的花费。

　　结果如下图

　　代码如下

代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Security;
using System.Reflection;

namespace ConsoleApplication1
{
    [AttributeUsage(AttributeTargets.Class)]
    class CodeReviewAttribute : System.Attribute
    {
        private string _reviewer;

        public string Reviewer
        {
            get { return _reviewer; }
        }
        private string _date;

        public string Date
        {
            get { return _date; }
        }
        private string _comment;

        public string Comment
        {
            get { return _comment; }
            set { _comment = value; }
        }
        public CodeReviewAttribute(string reviewer, string date)
        {
            this._reviewer = reviewer;
            this._date = date;
        }
    }
    [CodeReview("swb", "2009-9-9", Comment = "代码不好")]
    class MyClass
    {
    }
    [AttributeUsage(AttributeTargets.Enum | AttributeTargets.Field)]
    class NoteAttribute : System.Attribute
    {
        private string _name;

        public string Name
        {
            get { return _name; }
        }
        public NoteAttribute(string name)
        {
            this._name = name;
        }
    }

    enum Log
    {
        [Note("添加用户")]
        AddUser,
        [Note("修改用户")]
        ModifyUser
    }
    class EnumDescription
    {
        public static string Parse(Log type)
        {
            FieldInfo fields = type.GetType().GetField(type.ToString());
            object[] objs = fields.GetCustomAttributes(true);
            return ((NoteAttribute)objs[0]).Name;
        }
    }
    public interface IChinese
    {
        string Speak();
    }
    public class CNSpeaker : IChinese
    {
        #region Chinese Members

        public string Speak()
        {
            return "Chinese";
        }

        #endregion
    }
    public interface IEnglish
    {
        string Speak();
    }
    public class ENSpeaker : IEnglish
    {
        #region English Members

        string IEnglish.Speak()
        {
            return "English";
        }

        #endregion
    }
    class Program
    {
        static void Main(string[] args)
        {
            CNSpeaker cn = new CNSpeaker();
            Console.WriteLine(cn.Speak());
            IEnglish en = new ENSpeaker();
            Console.WriteLine(en.Speak());
            Console.WriteLine("---------------------");
            string str = "123";
            Console.WriteLine(string.Format("123 encrypt result: {0}", WebMD5Provider.WebFormMD5Encrypt(str)));
            Console.WriteLine("---------------------");
            MD5CryptoServiceProvider md5Provider = new MD5CryptoServiceProvider();
            byte[] encryptedBytes = md5Provider.ComputeHash(Encoding.UTF8.GetBytes(str));
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < encryptedBytes.Length; i++)
            {
                sb.AppendFormat("{0:x2}", encryptedBytes[i]);
            }

            Console.WriteLine(string.Format("123 encrypt result: {0}", sb.ToString()));
            Console.WriteLine("---------------------");

            System.Reflection.MemberInfo info = typeof(MyClass);
            CodeReviewAttribute att = (CodeReviewAttribute)Attribute.GetCustomAttribute(info, typeof(CodeReviewAttribute));
            if (att != null)
            {
                Console.WriteLine("MyClass 代码监察人：{0}", att.Reviewer);
                Console.WriteLine("MyClass 检查时间：{0}", att.Date);
                Console.WriteLine("MyClass 备注：{0}", att.Comment);
            }
            Console.WriteLine("---------------------");
            Log log = Log.AddUser;

            Console.WriteLine(string.Format ("Enum Log 的 AddUser 的注释是: {0}",EnumDescription.Parse(log)));

            Console.WriteLine("---------------------");
            Int64? bbb = 0;
            int? aaa = 0;
            Console.WriteLine("---------------------");

            decimal area = 110;
            Console.WriteLine("你的土地面积是：{0}", area);
            decimal amount = 10m;
            Console.WriteLine("你的每亩用量是是：{0}", amount );
            decimal budget = 0;

            List<pkgspec> pkgs = new List<pkgspec>();
            pkgs.Add(new pkgspec() { amount = 200, price = 180, id = 2 });
            pkgs.Add(new pkgspec() { amount = 100, price = 100, id = 1 });

            pkgs.Add(new pkgspec() { amount = 250, price = 250, id = 3 });

            pkgs.Sort(new Comparison<pkgspec>(compareDesc));

            // pkgs.Sort(new Comparison<pkgspec>(compareAsc));

            decimal totalAmount = area * amount;
            Console.WriteLine("你的总共用量是：{0}", totalAmount);
            int num = 0;

            List<pkgselect> select = new List<pkgselect>();

            foreach (pkgspec pkg in pkgs)
            {
                if (totalAmount % pkg.amount == totalAmount)
                {
                    num =1;
                    budget += num * pkg.price;
                    select.Add(new pkgselect() { id = pkg.id, num = num, price=pkg.price  });
                    break;
                }
                else if (totalAmount % pkg.amount == 0)
                {
                    num = (int)(totalAmount / pkg.amount);
                    budget += num * pkg.price;
                    select.Add(new pkgselect() { id = pkg.id, num = (int)(totalAmount / pkg.amount) , price=pkg.price });
                    break;
                }
                else
                {
                    num = (int)(totalAmount / pkg.amount);
                    budget += num * pkg.price;
                    select.Add(new pkgselect() { id = pkg.id, num = num , price=pkg.price });
                    totalAmount = totalAmount - num * pkg.amount;
                    continue;
                }
            }

            foreach (pkgselect s in select)
            {
                Console.WriteLine("你需要购买的包装编号是：{0}, 数量是 {1} 个，单价是 {2}", s.id, s.num, s.price);
            }
            Console.WriteLine("你购买的总价是: {0}", budget);

            Console.ReadLine();
        }
        private static int compareAsc(pkgspec pkg1, pkgspec pkg2)
        {
            if (pkg1.amount > pkg2.amount)
                return 1;
            if (pkg1.amount < pkg2.amount)
                return -1;
            else
                return 0;
        }
        private static int compareDesc(pkgspec pkg1, pkgspec pkg2)
        {
            if (pkg1.amount < pkg2.amount)
                return 1;
            if (pkg1.amount > pkg2.amount)
                return -1;
            else
                return 0;
        }
    }
    /// <summary>
    /// 选中的包装
    /// </summary>
    class pkgselect
    {
        /// <summary>
        /// 选中ID
        /// </summary>
        public int id;
        /// <summary>
        /// 购买数量
        /// </summary>
        public int num;
        /// <summary>
        /// 单价
        /// </summary>
        public decimal price;
    }
    /// <summary>
    /// 包装类型
    /// </summary>
    class pkgspec : IComparable<pkgspec>
    {
        /// <summary>
        /// 编号
        /// </summary>
        public int id;
        /// <summary>
        /// 包装量
        /// </summary>
        public decimal amount;
        /// <summary>
        /// 价格
        /// </summary>
        public decimal price;

        #region IComparable<pkgspec> Members

        public int CompareTo(pkgspec other)
        {
            if (this.amount > other.amount)
                return 1;
            if (this.amount == other.amount)
                return 0;
            else
                return -1;
        }

        #endregion
    }
}

代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Security;
using System.Security.Cryptography;
using System.IO;

namespace ConsoleApplication1
{
    /// <summary>
    /// 字符串加解密工具类
    /// </summary>
    public static class EncryptUtility
    {
        #region WinForm 的MD5和SHA1哈希，使得和System.Web.Security.FormsAuthentication的结果一致

        public static string WinFormMD5Encrypt(string data)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(data));
            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < encryptedBytes.Length; i++)
            {
                sb.AppendFormat("{0:x2}", encryptedBytes[i]);
            }
            return sb.ToString().ToUpper();
        }
        public static string WinFormSHA1Encrypt(string data)
        {
            SHA1CryptoServiceProvider md5 = new SHA1CryptoServiceProvider();
            byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(data));
            StringBuilder sb = new StringBuilder();

            for (int i = 0; i < encryptedBytes.Length; i++)
            {
                sb.AppendFormat("{0:x2}", encryptedBytes[i]);
            }
            return sb.ToString().ToUpper();
        }
        #endregion

        #region WebForm中的 MD5 和 SHA1 哈希

        /// <summary>
        /// 返回MD5哈希结果
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string WebFormMD5Encrypt(string data)
        {
            if (string.IsNullOrEmpty(data))
                throw new Exception("加密字符串不能为空");
            return FormsAuthentication.HashPasswordForStoringInConfigFile(data, "md5");
        }
        /// <summary>
        /// 返回SHA1哈希结果
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static string WebFormSHA1Encrypt(string data)
        {
            if (string.IsNullOrEmpty(data))
                throw new Exception("加密字符串不能为空");
            return FormsAuthentication.HashPasswordForStoringInConfigFile(data, "sha1");
        }

        #endregion
        #region 普通的字符变换加解密
        /// <summary>
        /// 普通字符还变
        /// 加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string CommonEncrypt(string data)
        {
            if (string.IsNullOrEmpty(data))
                throw new Exception("加密字符串不能为空");
            string result = string.Empty;

            int len = data.Length;
            for (int i = 0; i < len; i++)
            {
                result += (char)(data[i] + 10 - 1 * 2);
            }
            return result;
        }
        /// <summary>
        /// 普通的字符变换
        /// 解密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string CommonDecrypt(string data)
        {
            if (string.IsNullOrEmpty(data))
                throw new Exception("加密字符串不能为空");
            string result = string.Empty;
            int len = data.Length;
            for (int i = 0; i < len; i++)
            {
                result += (char)(data[i] - 10 + 1 * 2);
            }
            return result;
        }

        #endregion

        #region 带有密钥的加解密

        private static readonly string KEY_64 = System.Configuration.ConfigurationManager.AppSettings["key_64"];
        /// <summary>
        /// 带有密钥的加解密
        /// 加密
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string KeyEncrypt(string data)
        {
            using (DESCryptoServiceProvider provider = new DESCryptoServiceProvider())
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(data);
                provider.Key = ASCIIEncoding.ASCII.GetBytes(KEY_64.Substring(0, 8));
                provider.IV = ASCIIEncoding.ASCII.GetBytes(KEY_64);

                MemoryStream ms = new MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, provider.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Convert.ToBase64String(ms.ToArray());
                ms.Close();
                return str;
            }
        }
        /// <summary>
        /// 带有密钥的加解密
        /// 解密
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string KeyDecrypt(string data)
        {
            byte[] inputByteArray = Convert.FromBase64String(data);
            using (DESCryptoServiceProvider provider = new DESCryptoServiceProvider())
            {

                provider.Key = ASCIIEncoding.ASCII.GetBytes(KEY_64.Substring(0, 8));
                provider.IV = ASCIIEncoding.ASCII.GetBytes(KEY_64);

                MemoryStream ms = new MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, provider.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            }
        }
        #endregion
    }
    public class

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根据总用量计算每种包装规格的购买量和总价 | 重构-改善既有代码的设计（一）switch sta ...

2010-03-23 12:32
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