56 lines
2.3 KiB
C#
56 lines
2.3 KiB
C#
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namespace Swan
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{
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using System;
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using System.IO;
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using System.Net.Mail;
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using System.Reflection;
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/// <summary>
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/// Extension methods.
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/// </summary>
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public static class SmtpExtensions
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{
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private static readonly BindingFlags PrivateInstanceFlags = BindingFlags.Instance | BindingFlags.NonPublic;
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/// <summary>
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/// The raw contents of this MailMessage as a MemoryStream.
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/// </summary>
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/// <param name="this">The caller.</param>
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/// <returns>A MemoryStream with the raw contents of this MailMessage.</returns>
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public static MemoryStream ToMimeMessage(this MailMessage @this)
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{
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if (@this == null)
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throw new ArgumentNullException(nameof(@this));
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var result = new MemoryStream();
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var mailWriter = MimeMessageConstants.MailWriterConstructor.Invoke(new object[] { result });
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MimeMessageConstants.SendMethod.Invoke(
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@this,
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PrivateInstanceFlags,
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null,
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MimeMessageConstants.IsRunningInDotNetFourPointFive ? new[] { mailWriter, true, true } : new[] { mailWriter, true },
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null);
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result = new MemoryStream(result.ToArray());
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MimeMessageConstants.CloseMethod.Invoke(
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mailWriter,
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PrivateInstanceFlags,
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null,
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Array.Empty<object>(),
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null);
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result.Position = 0;
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return result;
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}
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internal static class MimeMessageConstants
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{
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#pragma warning disable DE0005 // API is deprecated
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public static readonly Type MailWriter = typeof(SmtpClient).Assembly.GetType("System.Net.Mail.MailWriter");
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#pragma warning restore DE0005 // API is deprecated
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public static readonly ConstructorInfo MailWriterConstructor = MailWriter.GetConstructor(PrivateInstanceFlags, null, new[] { typeof(Stream) }, null);
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public static readonly MethodInfo CloseMethod = MailWriter.GetMethod("Close", PrivateInstanceFlags);
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public static readonly MethodInfo SendMethod = typeof(MailMessage).GetMethod("Send", PrivateInstanceFlags);
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public static readonly bool IsRunningInDotNetFourPointFive = SendMethod.GetParameters().Length == 3;
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}
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}
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}
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