Xử lí ngoại lệ trong C#
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Exception Handling
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public class Humans
{
public int Age
{
get { return Age; }
set
{
if (value >= 0)
{
Age = value;
Console.WriteLine(“Tuoi la {0}”, Age);
}
else throw new Exception(“Tuoi khong chinh xac”);
}
}
}
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static void Main(string[] args)
{
Console.WriteLine(“Simple Exception Example”);
Humans a = new Humans() { Age = 30; }
try
{
for (int i = 0; i < 4; i++)
a.Age -= 10;
}
catch (Exception e)
{
Console.WriteLine(“Exception Message: {0}”, e.Message);
}
}
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Kết quả:
Tuoi la 30
Tuoi la 20
Tuoi la 10
Tuoi la 0
Exception Message: Tuoi khong chinh xac
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while (true)
{
try
{
Console.Write(“Nhap 1 so tu 1 den 10, nhap rong de thoat: ”);
string input = Console.ReadLine();
if (input == “”) break;
int index = Convert.ToInt32(input);
if (index < 1 || index > 10)
throw new IndexOutOfRangeException(“Ban da nhap so ” + input);
Console.WriteLine(“So ban nhap la {0}”, index);
}
catch(IndexOutOfRangeException e)
{
Console.WriteLine(“Co loi! Ban phai nhap so tu 1 den 10! {0}”, e.Message);
}
catch(Exception e)
{
Console.WriteLine(“Co loi! {0}”, e.Message);
}
}
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Khi chạy:
Nhap 1 so tu 1 den 10, nhap rong de thoat: 5
So ban nhap la 5
Nhap 1 so tu 1 den 10, nhap rong de thoat: 20
Co loi! Ban phai nhap so tu 1 den 10! Ban da nhap so 20
Nhap 1 so tu 1 den 10, nhap rong de thoat: abc
Co loi! Input string was not in a correct format.
Nhap 1 so tu 1 den 10, nhap rong de thoat:
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catch
{
Console.WriteLine(“Co loi nao do xay ra”);
}
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string path = @"c:\users\public\test.txt";
var file = new System.IO.StreamReader(path);
char[] buffer = new char[10];
try
{
file.ReadBlock(buffer, index, buffer.Length);
}
catch (System.IO.IOException e)
{
Console.WriteLine("Error reading from {0}. Message = {1}", path, e.Message);
}
finally
{
if (file != null)
{
file.Close();
}
}
