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Posted 11 Jan 2009

Adding Save() functionality to System.Net.Mail.MailMessage

, 19 Nov 2014
Using a combination of Reflector, Reflection, and C# 3.0 extension methods to add Save(string FileName) functionality to MailMessage in System.Net.Mail.
using System;
using System.Net.Mail;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;

namespace MailMessageExtension
    public static class MailMessageExt
        public static void Save(this MailMessage Message, string FileName)
            Assembly assembly = typeof(SmtpClient).Assembly;
            Type _mailWriterType = assembly.GetType("System.Net.Mail.MailWriter");

            using (FileStream _fileStream = new FileStream(FileName, FileMode.Create))
                // Get reflection info for MailWriter contructor
                ConstructorInfo _mailWriterContructor =
                        BindingFlags.Instance | BindingFlags.NonPublic,
                        new Type[] { typeof(Stream) }, 

                // Construct MailWriter object with our FileStream
                object _mailWriter = _mailWriterContructor.Invoke(new object[] { _fileStream });

                // Get reflection info for Send() method on MailMessage
                MethodInfo _sendMethod =
                        BindingFlags.Instance | BindingFlags.NonPublic);

                // Call method passing in MailWriter
                    BindingFlags.Instance | BindingFlags.NonPublic,
                    new object[] { _mailWriter, true },

                // Finally get reflection info for Close() method on our MailWriter
                MethodInfo _closeMethod =
                        BindingFlags.Instance | BindingFlags.NonPublic);

                // Call close method
                    BindingFlags.Instance | BindingFlags.NonPublic,
                    new object[] { },

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About the Author

Allan Eagle
Software Developer Globe Business Publishing Ltd
United Kingdom United Kingdom
Started tinkering on an old BBC Microcomputer using BBC BASIC and progressed up to dabbling with C and ARMCode on an Acorn RiscPC. Moving to the PC platform I progressed from C++ to now a lot of C# and ASP.NET.

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