Allow non-error data items

[cacowen]

I want to be able to set some Data items in the exception initially that can be pulled out when/if an exception is thrown. Like attaching metadata to a potential exception. However, when it comes time to call .ThrowIfContainsErrors(); it will throw because the Data count is > 0.

public class UserValidationException : Xeption
{
    public UserValidationException(Exception innerException)
        : base(message: "User validation errors occurred, please try again.", innerException)
    {
        Data.Add("StatusCode", StatusCodes.Status400BadRequest);
        Data.Add("ErrorCode", 400.01);
    }
}

Is this approach just bad, is there a way to already do this, or would it be useful to have a whitelisted list of keys that the ThrowIfContainsErrors will ignore?

Something like:

        Data.Add("StatusCode", StatusCodes.Status400BadRequest);
        Data.Add("ErrorCode", 400.01);
        NonErrorKeys.Add("StatusCode");
        NonErrorKeys.Add("ErrorCode");

and behind the scenes the methods for checking the Data within Xeption will ignore those keys.