Convert MailMessage to Raw text
.net, c#
Solution
Here's the same solution, but as an extension method to `MailMessage`.
Some of the reflection overhead is minimized by grabbing the `ConstructorInfo` and `MethodInfo` members once in the static context.
/// <summary>
/// Uses reflection to get the raw content out of a MailMessage.
/// </summary>
public static class MailMessageExtensions
{
private static readonly BindingFlags Flags = BindingFlags.Instance | BindingFlags.NonPublic;
private static readonly Type MailWriter = typeof(SmtpClient).Assembly.GetType("System.Net.Mail.MailWriter");
private static readonly ConstructorInfo MailWriterConstructor = MailWriter.GetConstructor(Flags, null, new[] { typeof(Stream) }, null);
private static readonly MethodInfo CloseMethod = MailWriter.GetMethod("Close", Flags);
private static readonly MethodInfo SendMethod = typeof(MailMessage).GetMethod("Send", Flags);
/// <summary>
/// A little hack to determine the number of parameters that we
/// need to pass to the SaveMethod.
/// </summary>
private static readonly bool IsRunningInDotNetFourPointFive = SendMethod.GetParameters().Length == 3;
/// <summary>
/// The raw contents of this MailMessage as a MemoryStream.
/// </summary>
/// <param name="self">The caller.</param>
/// <returns>A MemoryStream with the raw contents of this MailMessage.</returns>
public static MemoryStream RawMessage(this MailMessage self)
{
var result = new MemoryStream();
var mailWriter = MailWriterConstructor.Invoke(new object[] { result });
SendMethod.Invoke(self, Flags, null, IsRunningInDotNetFourPointFive ? new[] { mailWriter, true, true } : new[] { mailWriter, true }, null);
result = new MemoryStream(result.ToArray());
CloseMethod.Invoke(mailWriter, Flags, null, new object[] { }, null);
return result;
}
}
To grab the underlying `MemoryStream`:
var email = new MailMessage();
using (var m = email.RawMessage()) {
// do something with the raw message
}
Problem
Is there any easy way to convert a System.Net.Mail.MailMessage object to the raw mail message text, like when you open a eml file in notepad.