Setting the message of a custom Exception without passing it to the base constructor

Question

I want to make a custom Exception in C#, but in theory I do need to do a little parsing first before I can make a human readable ExceptionMessage.

The problem is that th

Answer 1

Consider the Microsoft Guidelines for creating new exceptions:

  using System;
  using System.Runtime.Serialization;

  [Serializable]
  public class CustomException : Exception
  {
    //
    // For guidelines regarding the creation of new exception types, see
    //    https://msdn.microsoft.com/en-us/library/ms229064(v=vs.100).aspx
    //

    public CustomException()
    {
    }

    public CustomException(string message) : base(message)
    {
    }

    public CustomException(string message, Exception inner) : base(message, inner)
    {
    }

    protected CustomException(SerializationInfo info, StreamingContext context) : base(info, context)
    {
    }

    public static CustomException FromJson(dynamic json)
    {
      string text = ""; // parse from json here

      return new CustomException(text);
    }
  }

Note the static factory method (not part of the pattern), that you can use in your program like this:

throw CustomException.FromJson(variable);

That way you followed best practice and can parse your json inside the exception class.