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

问题描述

我建立一个系统，在C＃阅读电子邮件。我已经得到了解析的问题，我认为这是涉及到编码的问题一个问题。

我读的主题是如下： = ISO-8859-1 Q = E6 = F8sd = E5f = F8sdf_sdfsdf？？？？ = ，发送的原始主题是æøsdåføsdfsdfsdf （在那里挪威字符）。

任何想法如何，我可以改变编码或解析这是否正确？ 。到目前为止，我试图用C＃编码转换技术，以主题为utf8编码，但没有任何运气

下面是我试过的解决方案之一：

 编码ISO = Encoding.GetEncoding（ISO-8859-1）; 
编码UTF = Encoding.UTF8; 
串decodedSubject = 
 utf.GetString（Encoding.Convert（UTF，异，
 iso.GetBytes（m.Subject.Split（）[3]））'？'）; 
  

解决方案

编码被称为的引用的可打印。

请参阅答案的this 问题。

从接受的回答：

 公共字符串DecodeQuotedPrintable（字符串值）
 {
附件附件= Attachment.CreateAttachmentFromString（，值）; 
返回attachment.Name; 
} 
  

在传递的字符串 =？ISO-8859- 1 Q + = = E6 = F8sd = E5f F8sdf_sdfsdf？= 这将返回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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