Derived exceptions must appear before base class exceptions. : Custom Exception « Language Basics « C# / CSharp Tutorial

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C# / CSharp Tutorial » Language Basics » Custom Exception 
1. 23. 3. Derived exceptions must appear before base class exceptions.
 
 
using System; 
 
class MyException : ApplicationException 
  public MyException() : base() { } 
  public MyException(string str: base(str) { } 
 
  public override string ToString() { 
    return Message; 
  

 
class MyDerivedException : MyException 
  public MyDerivedException() : base() { } 
  public MyDerivedException(string str: base(str) { } 
 
  public override string ToString() { 
    return Message;  
  

 
class MainClass 
  public static void Main() { 
    for(int x = 0; x < 3; x++) { 
      try 
        if(x==0
           throw new MyException("Caught an MyException exception")
        else if(x==1
           throw new MyDerivedException("Caught an MyDerivedException exception")
        else 
           throw new Exception()
      
      catch (MyDerivedException exc) { 
        // catch the exception 
        Console.WriteLine(exc)
      
      catch (MyException exc) { 
        // catch the exception 
        Console.WriteLine(exc)
      
      catch (Exception exc) { 
        Console.WriteLine(exc)
      
    
  
}

        
Caught an MyException exception
Caught an MyDerivedException exception
System.Exception: Exception of type 'System.Exception' was thrown.
   at MainClass.Main()
  
1. 23. Custom Exception
1. 23. 1. User-Defined Exception Classes
1. 23. 2. Use a custom Exception
1. 23. 3. Derived exceptions must appear before base class exceptions.
1. 23. 4. A custom exception with HelpLink and Source
1. 23. 5. Extends Exception
1. 23. 6. Create your own exception class based on Exception
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