Exception messages in English?

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This issue can be partially worked around. The Framework exception code loads the error messages from its resources, based on the current thread locale. In the case of some exceptions, this happens at the time the Message property is accessed.

For those exceptions, you can obtain the full US English version of the message by briefly switching the thread locale to en-US while logging it (saving the original user locale beforehand and restoring it immediately afterwards).

Doing this on a separate thread is even better: this ensures there won’t be any side effects. For example:

try
{
  System.IO.StreamReader sr=new System.IO.StreamReader(@"c:\does-not-exist");
}
catch(Exception ex)
{
  Console.WriteLine(ex.ToString()); //Will display localized message
  ExceptionLogger el = new ExceptionLogger(ex);
  System.Threading.Thread t = new System.Threading.Thread(el.DoLog);
  t.CurrentUICulture = new System.Globalization.CultureInfo("en-US");
  t.Start();
}

Where the ExceptionLogger class looks something like:

class ExceptionLogger
{
  Exception _ex;

  public ExceptionLogger(Exception ex)
  {
    _ex = ex;
  }

  public void DoLog()
  {
    Console.WriteLine(_ex.ToString()); //Will display en-US message
  }
}

However, as Joe correctly points out in a comment on an earlier revision of this reply, some messages are already (partially) loaded from the language resources at the time the exception is thrown.

This applies to the ‘parameter cannot be null’ part of the message generated when an ArgumentNullException(“foo”) exception is thrown, for example. In those cases, the message will still appear (partially) localized, even when using the above code.

Other than by using impractical hacks, such as running all your non-UI code on a thread with en-US locale to begin with, there doesn’t seem to be much you can do about that: the .NET Framework exception code has no facilities for overriding the error message locale.

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