C# Exception Exception(String)

Description

Exception Exception(String) initializes a new instance of the Exception class with a specified error message.

Syntax

Exception.Exception(String) has the following syntax.


public Exception(
  string message
)

Parameters

Exception.Exception(String) has the following parameters.

message - The message that describes the error.

Example

The code demonstrates the use of the constructor that takes a caller-specified message as a parameter, for both the derived class and the base Exception class.


/*from w  w  w.j av  a2s .  com*/
using System;
class NotEvenException : Exception
{
    const string notEvenMessage =
        "The argument to a function requiring " +
        "even input is not divisible by 2.";

    public NotEvenException() :
        base(notEvenMessage)
    { }

    public NotEvenException(string auxMessage) :
        base(String.Format("{0} - {1}",
          auxMessage, notEvenMessage))
    { }
}

class NewSExceptionDemo
{
    public static void Main()
    {
        try
        {
            throw new Exception(String.Format(
                "The argument {0} is not divisible by 2.",
                ""));
            throw new NotEvenException(
                String.Format("Invalid argument: {0}", ""));

            int halfInput = 0;
            Console.WriteLine(
                "Half of {0} is {1}.", "", halfInput);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }
}

The code above generates the following result.