将System.Net.mail.MailMessage保存为.msg文件 [英] save System.Net.mail.MailMessage as .msg file

问题描述

我正在构建一个应用程序，我有义务创建一个MailMessage（System.Net.mail.MailMessage）并将其保存在磁盘上.msg扩展不是.eml

I am building an application where i am obligated to create a MailMessage (System.Net.mail.MailMessage) and save it on the disk as .msg extention not .eml

下面是我用来将MailMessage保存为.msg文件的方法：

Below is the method i'm using to save a MailMessage as .msg file:

   public static void Save(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 =
                _mailWriterType.GetConstructor(
                    BindingFlags.Instance | BindingFlags.NonPublic,
                    null,
                    new Type[] { typeof(Stream) },
                    null);

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

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

            // Call method passing in MailWriter
            _sendMethod.Invoke(
                Message,
                BindingFlags.Instance | BindingFlags.NonPublic,
                null,
                new object[] { _mailWriter, true },
                null);

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

            // Call close method
            _closeMethod.Invoke(
                _mailWriter,
                BindingFlags.Instance | BindingFlags.NonPublic,
                null,
                new object[] { },
                null);
        }
    }

但保存的msg文件不打开和下面是错误：
无法打开文件xyz.msg。文件文件可能不存在，您可能没有权限打开它或可能由另一个程序打开....

But the saved msg file doesn't open and below is the error: "Cannot open file xyz.msg.The file file may not exist, you may not have permission to open it or it may be open by another program...."

我的问题是：如何将System.Net.mail.MailMessage保存为msg文件？

推荐答案

在这里瑞恩建议一个简单而好的方法，无需任何努力。

Here Ryan suggests an easy and great way to do it whithout any effort.

你实际上可以配置SmtpClient来发送电子邮件到文件
系统而不是网络。您可以使用
以下代码以编程方式执行此操作：

You can actually configure the SmtpClient to send emails to the file system instead of the network. You can do this programmatically using the following code:

SmtpClient client = new SmtpClient("mysmtphost");
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = @"C:\somedirectory";
client.Send(message);

您还可以在应用程序配置文件中进行设置：

You can also set this up in your application configuration file like this:

 <configuration>
     <system.net>
         <mailSettings>
             <smtp deliveryMethod="SpecifiedPickupDirectory">
                 <specifiedPickupDirectory pickupDirectoryLocation="C:\somedirectory" />
             </smtp>
         </mailSettings>
     </system.net>
 </configuration>

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