解码=？UTF-8？B'在C＃...？=字符串 [英] Decode a =?utf-8?B?...?= string in C#

问题描述

我用 VS2010 ， C＃用来阅读Gmail收件箱 IMAP ，它可以作为一个魅力，但我认为Unicode是不完全支持，因为我不能让波斯语字符串容易。

I use VS2010, C# to read gmail inbox using IMAP, it works as a charm, but I think unicode is not fully supported as I cannot get Persian (Farsi) strings easily.

比如我有我的字符串：سلام，但 IMAP 给我：？？？= UTF-的8B 2LPZhNin2YU =？=。

For instance I have my string: سلام, but IMAP gives me: "=?utf-8?B?2LPZhNin2YU=?=".

我怎样才能将其转换为原始字符串？从coverting UTF-8字符串任何提示？

How can I convert it to original string? any tips from coverting utf-8 to string?

感谢

推荐答案

让我们来看看的意思MIME编码：？？？？

Let's have a look at the meaning of the MIME encoding:

=?utf-8?B?...something...?=
    ^   ^
    |   +--- The bytes are Base64 encoded
    |
    +---- The string is UTF-8 encoded

所以，解码此，取 ...什么... 你的字符串（ 2LPZhNin2YU = 你的情况），然后

So, to decode this, take the ...something... out of your string (2LPZhNin2YU= in your case) and then

1. 扭转Base64编码

1. reverse the Base64 encoding

var bytes = Convert.FromBase64String("2LPZhNin2YU=");

解释字节为UTF8字符串

interpret the bytes as a UTF8 string

var text = Encoding.UTF8.GetString(bytes);

文本现在应包含所期望的结果。

text should now contain the desired result.

这格式的描述可以在维基百科中找到：

A description of this format can be found in Wikipedia:

• 的http：// EN .wikipedia.org /维基/ MIME＃编码字

• http://en.wikipedia.org/wiki/MIME#Encoded-Word

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