什么是“=C2=A0”？在 MIME 编码、引用的可打印文本中？
这是我试图解析的原始电子邮件示例：
MIME-version: 1.0
Content-type: text/html; charset=UTF-8
Content-transfer-encoding: quoted-printable
X-Mailer: Verizon Webmail
X-Originating-IP: [x.x.x.x]
=C2=A0test testing testing 123
什么是 =C2=A0？我已经尝试了六个引用可打印的解析器，但没有一个正确处理这个问题。 如何在 C# 中正确解析此内容？
老实说，现在我正在编码：
//TODO WTF
encoded = encoded.Replace("=C2=A0", "");
因为我无法弄清楚为什么该文本会随机出现在 MIME 内容中，并且不应该出现被渲染成任何东西。通过删除它，我就得到了想要的效果 - 但为什么？！
需要明确的是，我知道 (=[0-9A-F]{2}) 是一个编码字符。但在这种情况下，它似乎代表不了什么。
This is an example raw email I am trying to parse:
MIME-version: 1.0
Content-type: text/html; charset=UTF-8
Content-transfer-encoding: quoted-printable
X-Mailer: Verizon Webmail
X-Originating-IP: [x.x.x.x]
=C2=A0test testing testing 123
What is =C2=A0? I have tried a half dozen quoted-printable parsers, but none handle this correctly. How would one properly parse this in C#?
Honestly, for now, I'm coding:
//TODO WTF
encoded = encoded.Replace("=C2=A0", "");
Because I can't figure out why that text is there randomly within the MIME content, and isn't supposed to be rendered into anything. By just removing it, I'm getting the desired effect - but WHY?!
To be clear, I know that (=[0-9A-F]{2}) is an encoded character. But in this case, it seemingly represents NOTHING.
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=C2=A0表示字节 C2 A0。由于这是 UTF-8，因此它会转换为 U+00A0，这是不间断空格的 Unicode。请参阅UTF-8（维基百科）。
=C2=A0represents the bytes C2 A0. Since this is UTF-8, it translates to U+00A0, which is the Unicode for non-breaking space.See UTF-8 (Wikipedia).
%C2%A0 是不间断空格
%C2%A0 is a non breaking space
%C2%A0 这是隐藏文件夹的代码，创建一个隐藏文件夹并保存在里面，比如一个文本文件，然后通过浏览器打开这个文件，你就会在搜索栏中看到这些字符。据我了解，这些字符是可选的，不会转换为其他代码。
%C2%A0 This is the code of a hidden folder, create a hidden folder and save in it, for example, a text file, then open this file through a browser and you will see these characters in the search bar. As I understand it, these characters are optional and do not translate to other code.