/// <summary>
/// Initializes a new instance of <see cref="FlatFileTraceListener"/> with a file name, a header, a footer and
/// a <see cref="ILogFormatter"/>.
/// </summary>
/// <param name="fileName">The file stream.</param>
/// <param name="header">The header.</param>
/// <param name="footer">The footer.</param>
/// <param name="formatter">The formatter.</param>
public FlatFileTraceListener(string fileName, string header = null, string footer = null, ILogFormatter formatter = null)
: base(EnvironmentHelper.ReplaceEnvironmentVariables(fileName), formatter)
{
this.header = header ?? string.Empty;
this.footer = footer ?? string.Empty;
}