A dash is not valid to use everywhere, so for example in .NET framework the property of the System.Text.Encoding class that returns an instance of the UTF8Encoding class that handles the UTF-8 encoding is named UTF8.
It's definitely UTF-8. UTF8 is only used commonly in places where a dash is not allowed (programming language indentifiers) or because people are too lazy.
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这取决于您在哪里使用它...
编码的名称是
UTF-8。破折号并非在任何地方都有效，因此例如在 .NET Framework 中，
System.Text.Encoding类的属性返回处理UTF8Encoding类的实例UTF-8 编码被命名为UTF8。That depends on where you use it...
The name of the encoding is
UTF-8.A dash is not valid to use everywhere, so for example in .NET framework the property of the
System.Text.Encodingclass that returns an instance of theUTF8Encodingclass that handles the UTF-8 encoding is namedUTF8.肯定是UTF-8。 UTF8 通常只用在不允许破折号的地方（编程语言标识符）或者因为人们太懒了。
It's definitely UTF-8. UTF8 is only used commonly in places where a dash is not allowed (programming language indentifiers) or because people are too lazy.
根据 RFC 标准，答案是 UTF-8
http://www.ietf.org/rfc/rfc3629
Following the RFC standard the answer is UTF-8
http://www.ietf.org/rfc/rfc3629
我相信根据 Unicode 联盟的说法，它是 UTF-8。
I believe according to the Unicode Consortium, it's UTF-8.
还有 UTF-8 （对 UTF-8 的详尽解释）
Also UTF-8 (great and thorough explanation of UTF-8)