C#入门11.4——预定义异常类（1）

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异常类说明

Exception 所有异常对象的基类

SystemException 运行时产生的所有错误的基类

IndexOutOfRangeException 当一个数组的下标超出范围时运行时引发

NullReferenceException 当一个空对象被引用时运行时引发

ArgumentException 所有参数异常的基类

using System;using System.Collections.Generic;public class MyClass{public static void RunSnippet(){int[] myint = { 1,2,3,4,5,6,7,8,9,0};try{for(int i=0;i<11;i++)Console.WriteLine(myint[i]);}catch(IndexOutOfRangeException exIOR){Console.WriteLine(exIOR.Message.ToString());}}}

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索引超出了数组界限。

using System;using System.Collections.Generic;public class MyClass{public static void RunSnippet(){<span style="white-space:pre"></span>string mystr=null;<span style="white-space:pre"></span>try<span style="white-space:pre"></span>{<span style="white-space:pre"></span>Console.WriteLine(mystr.ToString());

}catch (NullReferenceException ex){Console.WriteLine(ex.Message.ToString());}}

using System;using System.Collections.Generic;public class MyClass{static int DivideByTwo(int num){if(num%2==1)throw new ArgumentException("此处必须为偶数","num");return num/2;}public static void RunSnippet(){try{Console.WriteLine(DivideByTwo(9));}catch(ArgumenException){Console.WriteLine("9不能被2整除");}}}}

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