显示来自 MIME 编码电子邮件字符串的消息 body
Displaying message body from MIME encoded email string
我们将停止使用 Lyris ListManager 帐户，但我们仍然可以访问 SQL 数据库中的数据。客户仍然希望访问消息存档，因此我们正在尝试寻找一种方法来获取数据库中经过编码的电子邮件消息字符串，并在浏览器中以可读格式显示它们。单个消息的字符串示例：
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Content-Type: multipart/alternative;
boundary="_000_D72176A059CDE746962E56C32F641BE3016734DDEDKCOEX2VKCOAD_"
--_000_D72176A059CDE746962E56C32F641BE3016734DDEDKCOEX2VKCOAD_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Testing. Please reply back if successful.
Thank you
[cid:image001.jpg@01D36CBE.C035BE50]
Jane Doe | Web Content Manager
jdoe@email.com<mailto:jdoe@email.com>
--_000_D72176A059CDE746962E56C32F641BE3016734DDEDKCOEX2VKCOAD_
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
<html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr=
osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:=
//www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
<meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)">
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font-size:11.0pt;
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mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
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{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
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</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Testing. Please reply back if succ=
essful.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Thank you,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Jane<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;line-height:12.05pt;te=
xt-autospace:none">
<b><span style=3D"font-size:10.0pt;font-family:"Arial","sans=
-serif""><img width=3D"90" height=3D"36" id=3D"_x0000_i1025" src=3D"ci=
d:image001.jpg@01D36CBE.C035BE50"></span></b><b><span lang=3D"EN-AU" style=
=3D"font-size:10.0pt;font-family:"Arial","sans-serif"">=
<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-AU" style=3D"font-size:10.0pt;fo=
nt-family:"Arial","sans-serif"">Jane Doe
</span></b><span lang=3D"EN-AU" style=3D"font-size:10.0pt;font-family:"=
;Arial","sans-serif"">|<b>
</b>Web Content Manager<br>
<a href=3D"mailto:jdoe@email.com">jdoe@email.com</a><=
/span><o:p></o:p></p>
</div>
</body>
</html>
--_000_D72176A059CDE746962E56C32F641BE3016734DDEDKCOEX2VKCOAD_--
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根据我在网上看到的一些建议，我正在尝试使用 MimeKit 进行解析，但我不确定如何正确使用它。理想情况下，我们希望能够只获取消息 body。我试过以下方法：
byte[] byteArray = Encoding.UTF8.GetBytes(row["body_"].ToString());
MemoryStream stream = new MemoryStream(byteArray);
var thisMssg = MimeMessage.Load(stream);
mssg.Text = thisMssg.TextBody;
但这会导致 "Failed to parse message headers."
我也试过使用 QuotedPrintableDecoder:
var decoder = new QuotedPrintableDecoder();
var buffer = Encoding.ASCII.GetBytes(row["body_"].ToString());
var output = new byte[decoder.EstimateOutputLength(buffer.Length)];
int used = decoder.Decode(buffer, 0, buffer.Length, output);
mssg.Text = System.Text.Encoding.ASCII.GetString(output, 0, used));
这至少会向浏览器输出一些内容 semi-readable，但消息上方和下方仍有 headers 和编码文本。
感谢任何帮助。我在网上看到的大多数例子都涉及解码电子邮件文件；我可能在尝试将字符串转换为字节时做错了什么，或者我可能完全不了解整个事情。
更新：这对某些消息来说效果很好，但对其他消息来说，HtmlBody 和 TextBody 都是空白的。我怀疑我使用了错误的编码或类似的东西。下面是一个 headers + body 的示例，其中一条消息未返回任何内容：
Return-Path: <jane.doe@email.com>
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From: Jennifer Blosser <jane.doe@email.com>
To: test List <groups@groups.org>
Subject: test subject
Thread-Topic: test subject
Thread-Index: AdUlODR9gfN51vIpRPKLoCMeLjIytQ==
Date: Mon, 17 Jun 2019 18:15:03 +0000
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SWON: Please see information below about CEU offering from Be The Match in=
July. Mercury SWON co-moderator:
Be sure to attend our upcoming webinar, Sickle Cell Disease: Exploring Trea=
tment Options and Psychosocial Care.<https://urldefense.proofpoint.com/v2/u=
rl?u=3Dhttps-3A__go.pardot.com_l_566592_2019-2D06-2D10_gmysfg-3Futm-5Fsourc=
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message body here.
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QuotedPrintableDecoder 方法是否需要发挥作用？我已经查看了 http://www.mimekit.net/docs/html/Working-With-Messages.htm，但我希望我不必手动遍历每个部分，并且仍然有一种方法可以只获取消息 body。
您使用 MimeKit 遇到的问题给您关于无法解析 headers 的错误是因为您的字符串缺少消息 headers.
您实际上在做的是要求 MIME 解析器从消息的中途开始解析消息。你给了它一个不可能完成的任务。
您需要将原始消息 headers 与上述字符串组合以生成原始（完整）消息源，然后才能对其进行解析。
或者你必须伪造原始消息 headers 以便正确解析。
大概您的数据库中某处有原始消息 headers？
Does the QuotedPrintableDecoder method need to come into play? I've reviewed http://www.mimekit.net/docs/html/Working-With-Messages.htm, but I'm hoping I don't have to manually traverse each part and there's still a way to grab just the message body.
通常不需要自己使用任何 low-level 解码器（或编码器）。
有多种获取消息的方法body:
- 手动遍历 MIME 树（但通常我不推荐这样做），但要做到这一点，您确实需要了解 MIME 的结构以及常见的邮件客户端如何构造它们的消息。除非您使用 MIME well-read，否则我一般不会推荐它。 （难度：极限）
- 使用MimeIterator。在大多数情况下，除非您想在不使用任何递归的情况下手动遍历 MIME 树结构，否则我不会费心使用这种方法。这个 class 真正派上用场的地方是如果你正在实现更类似于 IMAP 服务器的东西。同样，您需要了解 MIME 的工作原理才能真正利用它。有关如何使用它的简单示例，请参阅文档。 （难度：极限）
- 使用MimeVisitor子class遍历MIME树结构。有关如何执行此操作的一个很好的示例，我建议您查看文档示例中的
HtmlPreviewVisitor class。如果您想像邮件客户端那样 "render" 消息，这可能是最好的处理方式。 （难度：中等）
- 如果您想要的只是获取消息的快速而肮脏的方式 body 并且您不关心尝试以与 Outlook 或 GMail 相同的方式呈现消息，那么您可以使用
MimeMessage.TextBody and/or MimeMessage.HtmlBody 属性。 （难度：简单模式）
如果我是你，我可能会在 TextBody/HtmlBody 属性和使用类似于示例文档中的 HtmlPreviewVisitor class 的属性之间做出选择。它们将是完成您想做的事情的最简单方法。
我们将停止使用 Lyris ListManager 帐户，但我们仍然可以访问 SQL 数据库中的数据。客户仍然希望访问消息存档，因此我们正在尝试寻找一种方法来获取数据库中经过编码的电子邮件消息字符串，并在浏览器中以可读格式显示它们。单个消息的字符串示例：
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Testing. Please reply back if successful.
Thank you
[cid:image001.jpg@01D36CBE.C035BE50]
Jane Doe | Web Content Manager
jdoe@email.com<mailto:jdoe@email.com>
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<a href=3D"mailto:jdoe@email.com">jdoe@email.com</a><=
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根据我在网上看到的一些建议，我正在尝试使用 MimeKit 进行解析，但我不确定如何正确使用它。理想情况下，我们希望能够只获取消息 body。我试过以下方法：
byte[] byteArray = Encoding.UTF8.GetBytes(row["body_"].ToString());
MemoryStream stream = new MemoryStream(byteArray);
var thisMssg = MimeMessage.Load(stream);
mssg.Text = thisMssg.TextBody;
但这会导致 "Failed to parse message headers."
我也试过使用 QuotedPrintableDecoder:
var decoder = new QuotedPrintableDecoder();
var buffer = Encoding.ASCII.GetBytes(row["body_"].ToString());
var output = new byte[decoder.EstimateOutputLength(buffer.Length)];
int used = decoder.Decode(buffer, 0, buffer.Length, output);
mssg.Text = System.Text.Encoding.ASCII.GetString(output, 0, used));
这至少会向浏览器输出一些内容 semi-readable，但消息上方和下方仍有 headers 和编码文本。
感谢任何帮助。我在网上看到的大多数例子都涉及解码电子邮件文件；我可能在尝试将字符串转换为字节时做错了什么，或者我可能完全不了解整个事情。
更新：这对某些消息来说效果很好，但对其他消息来说，HtmlBody 和 TextBody 都是空白的。我怀疑我使用了错误的编码或类似的东西。下面是一个 headers + body 的示例，其中一条消息未返回任何内容：
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From: Jennifer Blosser <jane.doe@email.com>
To: test List <groups@groups.org>
Subject: test subject
Thread-Topic: test subject
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Date: Mon, 17 Jun 2019 18:15:03 +0000
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SWON: Please see information below about CEU offering from Be The Match in=
July. Mercury SWON co-moderator:
Be sure to attend our upcoming webinar, Sickle Cell Disease: Exploring Trea=
tment Options and Psychosocial Care.<https://urldefense.proofpoint.com/v2/u=
rl?u=3Dhttps-3A__go.pardot.com_l_566592_2019-2D06-2D10_gmysfg-3Futm-5Fsourc=
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QuotedPrintableDecoder 方法是否需要发挥作用？我已经查看了 http://www.mimekit.net/docs/html/Working-With-Messages.htm，但我希望我不必手动遍历每个部分，并且仍然有一种方法可以只获取消息 body。
您使用 MimeKit 遇到的问题给您关于无法解析 headers 的错误是因为您的字符串缺少消息 headers.
您实际上在做的是要求 MIME 解析器从消息的中途开始解析消息。你给了它一个不可能完成的任务。
您需要将原始消息 headers 与上述字符串组合以生成原始（完整）消息源，然后才能对其进行解析。
或者你必须伪造原始消息 headers 以便正确解析。
大概您的数据库中某处有原始消息 headers？
Does the QuotedPrintableDecoder method need to come into play? I've reviewed http://www.mimekit.net/docs/html/Working-With-Messages.htm, but I'm hoping I don't have to manually traverse each part and there's still a way to grab just the message body.
通常不需要自己使用任何 low-level 解码器（或编码器）。
有多种获取消息的方法body:
- 手动遍历 MIME 树（但通常我不推荐这样做），但要做到这一点，您确实需要了解 MIME 的结构以及常见的邮件客户端如何构造它们的消息。除非您使用 MIME well-read，否则我一般不会推荐它。 （难度：极限）
- 使用MimeIterator。在大多数情况下，除非您想在不使用任何递归的情况下手动遍历 MIME 树结构，否则我不会费心使用这种方法。这个 class 真正派上用场的地方是如果你正在实现更类似于 IMAP 服务器的东西。同样，您需要了解 MIME 的工作原理才能真正利用它。有关如何使用它的简单示例，请参阅文档。 （难度：极限）
- 使用MimeVisitor子class遍历MIME树结构。有关如何执行此操作的一个很好的示例，我建议您查看文档示例中的
HtmlPreviewVisitorclass。如果您想像邮件客户端那样 "render" 消息，这可能是最好的处理方式。 （难度：中等） - 如果您想要的只是获取消息的快速而肮脏的方式 body 并且您不关心尝试以与 Outlook 或 GMail 相同的方式呈现消息，那么您可以使用
MimeMessage.TextBodyand/orMimeMessage.HtmlBody属性。 （难度：简单模式）
如果我是你，我可能会在 TextBody/HtmlBody 属性和使用类似于示例文档中的 HtmlPreviewVisitor class 的属性之间做出选择。它们将是完成您想做的事情的最简单方法。