using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
namespace ConsoleApplication3
{
[Serializable] //聲明為可序列化的 因為要寫入文件中
public class PayOverflowException : ApplicationException//由用戶程序引發，用于派生自定義的異常類型
{
/// summary>
/// 默認構造函數
/// /summary>
public PayOverflowException() { }
public PayOverflowException(string message)
: base(message) { }
public PayOverflowException(string message, Exception inner)
: base(message, inner) { }
//public PayOverflowException(System.Runtime.Serialization.SerializationInfo info,
// System.Runtime.Serialization.StreamingContext context)
// : base(info, context) { }
}
internal class Employee
{
public int ID { get; set; }
public string Name { get; set; }
/// summary>
/// current pay
/// /summary>
public int CurrPay { get; set; }
public Employee() { }
public Employee(int id, string name, int currpay)
{
this.ID = id;
this.Name = name;
this.CurrPay = currpay;
}
/// summary>
/// 定義一個GiveBunus的虛方法以供不同的派生類進行重載
/// /summary>
/// param name="amount">獎金額度/param>
public virtual void GiveBunus(int amount)
{
//用一個臨時變量記錄遞增之前的值
var pay = CurrPay;
this.CurrPay += amount;
if (CurrPay > 10000)
{
//發生異常,將CurrPay的值進行恢復,
//并拋出異常,外部程序捕獲次異常
this.CurrPay = pay;
var ex = new PayOverflowException("The employee's max pay should be no more than 10000.");
throw ex;
}
}
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("**** 創建Employee對象，并用try/catch捕獲異常 *****");
var emp = new Employee(10001, "Yilly", 8000);
try
{
emp.GiveBunus(3000);
}
catch (PayOverflowException ex)
{
Console.WriteLine("異常信息:{0}\n發生于{1}類的{2}方法", ex.Message,
ex.TargetSite.DeclaringType, ex.TargetSite.Name);
try
{
var file = new FileStream(@"c:\customerexception.txt", FileMode.Create);
//*** 異常信息寫入文件中的代碼省略...
//以序列化方式寫入
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(file, ex);
file.Close();
//以字節方式寫入
//byte[] buffer = System.Text.Encoding.Default.GetBytes(ex.Message);
//int leng = 0;
//leng = buffer.GetLength(0);
//file.Write(buffer, 0, leng);
//file.Close();
}
catch (Exception ex1)
{
var inner = new PayOverflowException(ex.Message, ex1);
throw inner;
}
}
}
}
}