CODEWITHSUNDEEP
c#.net
Unbreakable
Unbreakable

Reputation: 8102

How to pass value to base constructor in C# only after some manipulation

Ok, this question has been answered in SO and here is the How to pass value to base constructor

public SMAPIException( string message) : base(message)
{
    TranslationHelper instance = TranslationHelper.GetTranslationHelper; // singleton class
    string localizedErrMessage = instance.GetTranslatedMessage(message, "" );
    // code removed for brevity sake.
}

But suppose I want to manipulate the "message" info and then set the base class constructor, then how to do it.

Pseudo code below:

public SMAPIException( string message) : base(localizedErrMessage)
{
    TranslationHelper instance = TranslationHelper.GetTranslationHelper; // singleton class
    string localizedErrMessage = instance.GetTranslatedMessage(message, "" );
    // code removed for brevity sake.
}

// So basically I want the localizedErrMessage to be sent instead of message to base class constructor, is it possible? Please guide me.

Upvotes: 5

Views: 4110

Answers (3)

Felix D.
Felix D.

Reputation: 5113

This should work:

public class SMAPIException : Exception
{
    public SMAPIException(string str) : base(ChangeString(str))
    {
        /*   Since SMAPIException derives from Exceptions we can use 
         *   all public properties of Exception
         */
        Console.WriteLine(base.Message);
    }

    private static string ChangeString(string message)
    {
        return $"Exception is: \"{message}\"";
    }
}

Note that ChangeString has to be static !

Example:

SMAPIException ex = new SMAPIException("Here comes a new SMAPIException");

//  OUTPUT //
// Exception is "Here comes a new SMAPIException"

Inspecting your BaseType:

// Summary:
//     Initializes a new instance of the System.Exception class with a specified error
//     message.
//
// Parameters:
//   message:
//     The message that describes the error.
public Exception(string message);

Calling base(string message) is the same as new Exception("message")

So you can get the passed value using the Message-Property.

BUT ! this only works if SMAPIException does not hide it's base member new string Message {get; set;} !

Upvotes: 6

Antoine V
Antoine V

Reputation: 7204

You can call your static method in the parameter list of the base class constructor.

public SMAPIException( string message) 
      : base(TranslationHelper.GetTranslationHelper.GetTranslatedMessage(message, ""))
{
}

Upvotes: 0

Ian
Ian

Reputation: 1251

Have a static factory method, and make the constructor private:

class SMAPIException
{
    private SMAPIException(string message) : base(message)
    {
        // whatever initialization
    }

    public static SMAPIException CreateNew(string message)
    {
        string localizedErrMessage;
        // do whatever to set localizedErrMessage

        return SMAPIException(localizedErrMessage);
    }
}

You can then use:

SMAPIException localizedEx = SMAPIException.CreateNew("unlocalizedString");

Upvotes: 3

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