Question

The code:

  public Constructor(string vConnection_String)
  {
     try
     {
        mConnection_String = vConnection_String;
     }
     catch (Exception ex)
     {
        ExceptionHandler.CatchEx(ex);
     }
  }

I think the person who programmed this was “just being careful,” but out of interest what exceptions could be thrown on a line that does a string assignment like this one here? I can think of System.OutOfMemoryException, but what others?

Thank you

Answer 1

Herb Sutter write several great articles about exception safety, and in one of them he shows 3 types of exception safety:

1. the basic guarantee

2. the strong guarantee

3. the nothrow guarantee

This principles are commonly known in C++ world but we could use them in .net world too because one of them takes place in your situation.

If mConnection_String is a field of type System.String (or another reference type) than you definitely know, that this code is “nothrow guarantee”, because simple assignment for reference type could not throw exceptions at all.