C＃电子邮件主题解析 [英] C# Email subject parsing

问题描述

我正在构建一个在C＃中阅读电子邮件的系统。解决问题时遇到问题，我认为与编码有关的问题。

我正在阅读的主题如下： =？ISO-8859-1？Q？= E6 = F8sd = E5f = F8sdf_sdfsdf？ = ，发送的原始主题是æøsdåføsdfsdfsdf （挪威字符在那里）。

任何想法如何更改编码或解析这个正确？到目前为止，我试图使用C＃编码转换技术将主题编码为utf8，但没有任何运气。

这是我尝试的一个解决方案： / p>

 编码iso = Encoding.GetEncoding（iso-8859-1）; 
编码utf = Encoding.UTF8; 
 string decodingSubject = 
 utf.GetString（Encoding.Convert（utf，iso，
 iso.GetBytes（m.Subject.Split（'？'）[3]）））; 
  

解决方案

编码称为 quoted printable 。

查看此问题。

改编自接受的答案：

  public string DecodeQuotedPrintable（string value）
 {
附件附件= Attachment.CreateAttachmentFromString（，value）; 
 return attachment.Name; 
} 
  

传递字符串 =？ISO-8859- 1？Q？= E6 = F8sd = E5f = F8sdf_sdfsdf？= 返回æøsdåføsdf_sdfsdf。

I'm building a system for reading emails in C#. I've got a problem parsing the subject, a problem which I think is related to encoding.

The subject I'm reading is as follows: =?ISO-8859-1?Q?=E6=F8sd=E5f=F8sdf_sdfsdf?=, the original subject sent is æøsdåføsdf sdfsdf (Norwegian characters in there).

Any ideas how I can change encoding or parse this correctly? So far I've tried to use the C# encoding conversion techniques to encode the subject to utf8, but without any luck.

Here is one of the solutions I tried:

Encoding iso = Encoding.GetEncoding("iso-8859-1");
Encoding utf = Encoding.UTF8;
string decodedSubject =
    utf.GetString(Encoding.Convert(utf, iso,
                                   iso.GetBytes(m.Subject.Split('?')[3])));

解决方案

The encoding is called quoted printable.

See the answers to this question.

Adapted from the accepted answer:

public string DecodeQuotedPrintable(string value)
{
        Attachment attachment = Attachment.CreateAttachmentFromString("", value);
        return attachment.Name;
}

When passed the string =?ISO-8859-1?Q?=E6=F8sd=E5f=F8sdf_sdfsdf?= this returns "æøsdåføsdf_sdfsdf".

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