private void RaiseCustomHeaderEvent(CustomHeaderEventArgs e)
 {
     if (CustomHeader != null)
     {
         CustomHeader(this, e);
     }
 }
        protected override void CustomFormat(IEnumerable<object[]> objects, OperationInterop interop)
        {
            using (var sr = new StreamWriter(Streams.Values.Single(), Encoding ?? Encoding.Default))
            {
                var ch = new CustomHeaderEventArgs(interop);
                RaiseCustomHeaderEvent(ch);

                if (!String.IsNullOrEmpty(ch.HeaderText))
                {
                    if (listDivider == null)
                    {
                        sr.WriteLine(ch.HeaderText);
                    }
                    else
                    {
                        sr.Write(ch.HeaderText + listDivider);
                    }
                }

                foreach (var obj in objects)
                {
                    if (listDivider == null)
                    {
                        sr.WriteLine(String.Join(elemDivider, obj));
                    }
                    else
                    {
                        sr.Write(String.Join(elemDivider, obj) + listDivider);
                    }

                    interop.ThrowIfCancellationRequested();
                }

                var cf = new CustomFooterEventArgs(interop, objects);
                RaiseCustomFooterEvent(cf);

                if (!String.IsNullOrEmpty(cf.FooterText))
                {
                    if (listDivider == null)
                    {
                        sr.WriteLine(cf.FooterText);
                    }
                    else
                    {
                        sr.Write(cf.FooterText + listDivider);
                    }
                }

                sr.Flush();
            }
        }