在我們正在開發的應用程式中，當發生違反業務規則的情況時，我們會引發自訂異常來處理這種情況。自訂異常是專門為解決應用程式中的獨特場景而創建的異常。為了建立自訂異常，我們從 C# 中的 ApplicationException 或 Exception 類別衍生出一個新類別。 ApplicationException 類別從 .NET v1.0 版本開始包含在 .NET Framework 中，旨在用作 C# 中自訂例外類別的基底類別。
下面給出的是提到的例子：
C# 程序，示範在程式中使用自訂異常。
代碼：
using System;
//a namespace called user defined is defined
namespace UserDefined
{
//a class called test weather is defined
class Testweather
{
//main method is called
static void Main(string[] args)
{
//an instance of the class temperat is defined
Temperat tem = new Temperat();
try
{
//the show method of temperat class is called using the instance of the temperat class
tem.show();
}
catch(WeatheriscoldException e)
{
Console.WriteLine("The weather is cold Exception: {0}", e.Message);
}
Console.ReadKey();
}
}
}
//a custom exception class called Weather is cold Exception class is created which is thrown if the weather is cold
public class WeatheriscoldException: Exception
{
public WeatheriscoldException(string message): base(message)
{
}
}
//a class called temperat is defined
public class Temperat
{
//a variable called temp is defined and assigned to zero
int temp = 0;
//a method called show is defined
public void show()
{
//the temperature is checked to determine the weather
if(temp == 0)
{
throw (new WeatheriscoldException("The temperature is found to be zero and hence the weather is cold"));
}
else
{
Console.WriteLine("The Temperature is: {0}", temp);
}
}
}輸出：
說明：
C# 程序，示範在程式中使用自訂異常。
代碼：
using System;
//a namespace called exception handling is defined
namespace ExceptionHandling
{
//The custom exception class called odd num exception class is created by inheriting the exception class
public class OddNumException : Exception
{
//The property message is being overridden here
public override string Message
{
get
{
return "There cannot be an odd divisor";
}
}
}
//a class called check is defined
class check
{
//main method is called
static void Main(string[] args)
{
//three integer variables are defined
int a, b, c;
Console.WriteLine("Please enter two numbers and type of the numbers must be integer:");
a = int.Parse(Console.ReadLine());
b = int.Parse(Console.ReadLine());
try
{
//checking if the divisor is an odd number or an even number
if (b % 2 > 0)
{
//exception is thrown if the divisor is an odd number
throw new OddNumException();
}
c = a / b;
Console.WriteLine(c);
}
catch (OddNumException two)
{
Console.WriteLine(two.Message);
}
Console.WriteLine("The program ends here");
Console.ReadKey();
}
}
}輸出：
說明：
以下是提到的優點：
以上是C# 中的自訂異常的詳細內容。更多資訊請關注PHP中文網其他相關文章！
