《C#入门到精通》学习笔记 -- 实践： 自定义异常类的实现（2013-04-18）

namespace CustomizedExceptionClass
{
    class Program
    {
        static void Main(string[] args)
        {
            const string currentAccountId = "12345678";

            try
            {
                LoginFunc(currentAccountId);
            }
            catch (UnMatchedTypeException e)
            {
                throw e;
            }
            catch(DuplicatedAccountIdExceptin e)
            {
                Console.Write(e);
            }
        }

        private static void LoginFunc(string account)
        {
            if(account.Length > 5)
            {
                throw new UnMatchedTypeException("AccountID can not be longer than 15 chars");
            }

            if(account == "aaa")
            {
                throw new DuplicatedAccountIdExceptin("The account id is already exist.");
            }
            return;
        }
    }

    /// <summary>
    /// 自定义的异常类
    /// </summary>
    internal class CustomizedExceptionClass : Exception
    {
        /// <summary>
        /// Initializes a new instance of the CustomizedExceptionClass class.
        /// </summary>
        public CustomizedExceptionClass()
        {
        }

        /// <summary>
        /// Initializes a new instance of the CustomizedExceptionClass class.  Takes a message.
        /// </summary>
        /// <param name="message">Reason for the exception</param>
        public CustomizedExceptionClass(string message):base(message)
        {
        }

        /// <summary>
        /// Initializes a new instance of the CustomizedExceptionClass class. Used for chaining exceptions.
        /// </summary>
        /// <param name="message">Reason for the exception</param>
        /// <param name="innerException">Chained exception</param>
        public CustomizedExceptionClass(string message, Exception innerException)
            : base(message, innerException)
        {
        }

        /// <summary>
        /// Initializes a new instance of the CustomizedExceptionClass class.  Used for serialization exceptions
        /// </summary>
        /// <param name="info">Serialization info</param>
        /// <param name="context">Streaming context</param>
        protected CustomizedExceptionClass(
            System.Runtime.Serialization.SerializationInfo info,
            System.Runtime.Serialization.StreamingContext context)
            : base(info, context)
        {
        }
    }

    /// <summary>
    /// 类型不匹配异常
    /// </summary>
    class UnMatchedTypeException : CustomizedExceptionClass
    {
        public UnMatchedTypeException()
        {
        }

        public UnMatchedTypeException(string message)
            : base(message)
        {
        }
    }

    /// <summary>
    /// 用户ID重复异常
    /// </summary>
    class DuplicatedAccountIdExceptin:CustomizedExceptionClass
    {
         public DuplicatedAccountIdExceptin()
         {
         }

         public DuplicatedAccountIdExceptin(string message)
             : base(message)
        {
        }
    }