如何解码"=?utf-8?B?...?="串入C# [英] How to Decode "=?utf-8?B?...?=" to string in C#

问题描述

我使用Visual Studio 2010，C#通过IMAP读取Gmail收件箱，它很吸引人，但我认为不完全支持Unicode，因为我无法轻松获得波斯语(波斯语)字符串.

I use Visual Studio 2010, 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.

例如，我有我的字符串:سلام，但是IMAP给了我:"=?utf-8?B?2LPZhNin2YU=?=".

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

如何将其转换为原始字符串?从转换utf-8到字符串的任何提示吗?

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

推荐答案

让我们看一下MIME编码的含义:

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

因此，要对此进行解码，请从字符串中删除...something...(在您的情况下为2LPZhNin2YU=)，然后

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

1. 反转Base64编码

1. reverse the Base64 encoding

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

将字节解释为UTF8字符串

interpret the bytes as a UTF8 string

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

text现在应包含所需的结果.

text should now contain the desired result.

有关这种格式的说明，请参见Wikipedia:

A description of this format can be found in Wikipedia:

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

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