异常处理语句

来源：互联网发布：黄品源知乎编辑：程序博客网时间：2024/05/17 05:15

1.try---catch语句

try

{

被监控的代码

}

catch(异常类名异常变量名)

{

异常处理

}

eg：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 例9_1_try__catch的使用
{
class Program
{
static void Main(string[] args)
{
try
{
object obj = null ;
int N = (int)obj;
}
catch (Exception ex)
{
Console.WriteLine("捕获异常："+ex);
}
Console.ReadLine();
}
}
}

eg2：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 例9_2try_catch的使用
{
class Program
{
static void Main(string[] args)
{
try
{
checked
{
int Inum1;
int Inum2;
int num;
Inum1 = 6000000;
Inum2 = 6000000;
num = Inum1 + Inum2;
Console.WriteLine(num);
}
}
catch (OverflowException) //捕获在算术运算时导致溢出时引发的异常
{
Console.WriteLine("引发OverflowException异常：");
}
Console.ReadLine();
}
}
}

2.throw语句：
eg：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 例9_3_throw的使用
{
class Program
{
class test
{
public int MyInt(string a, string b)
{
int int1;
int int2;
int num;
try
{
int1 = int.Parse(a);
int2 = int.Parse(b);
if (int2 == 0)
{
throw new DivideByZeroException();
}
num = int1 / int2;
return num;
}
catch(DivideByZeroException de)
{
Console.WriteLine("用零除整数发生异常！");
Console.WriteLine(de.Message) ;
return 0;
}
}
}
static void Main(string[] args)
{
try
{
Console.WriteLine("请输入分子：");
string str1 = Console.ReadLine();
Console.WriteLine("请输入分母：");
string str2 = Console.ReadLine();
test tt = new test();
Console.WriteLine("分子除以分母的值：" + tt.MyInt(str1, str2));
}
catch (FormatException)
{
Console.WriteLine("请输入数字格式数据");
}
Console.ReadLine();
}
}
}

3.try--catch--finally语句

try

{

被监控的代码

}

catch(异常类名异常变量名)

{

异常处理

}

finally

{

程序代码

}

eg：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 例9_4_try__catch__finally语句
{
class Program
{
static void Main(string[] args)
{
string str = "用一生下载你";
object obj = str;
try
{
int i = (int)obj;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
Console.WriteLine("程序执行完毕...");
}
Console.ReadLine();
}
}
}

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