是什么使得 Select、Join、Where 等方法成为 Linq-to-Object 的标准查询运算符而不是......？
1）在内部，是什么使得诸如 Select、Join、Where 等方法（除了查询表达式被编译器翻译成这些方法调用）是 Linq-to-Object 的标准查询运算符，而不仅仅是碰巧对数据序列进行操作的常规方法？
也就是说，这些运算符提供的所有功能也可以在常规方法中实现，但我们不将这些常规方法称为标准查询运算符？！
2) Linq-to-XML 方法也有同样的问题 - 那么，是什么让它们查询运算符而不仅仅是操作 XML 数据的常规方法？
谢谢
1) Internally, what is it that makes methods such Select, Join, Where etc ( besides the fact that query expressions get translated by compiler into these method calls ) a Linq-to-Object's standard query operators and not just regular methods that happen to operate on sequences of data?
Namelly, all the functionality offered by those operators could also be implemented in regular methods, but we don't call those regular methods standard query operators?!
2) Same question for Linq-to-XML methods – thus, what makes them query operators and not just regular methods that operate on XML data?
Thank you
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它们是“只是常规（以及扩展）方法”，但它们也在 LINQ 标准查询运算符 页面：
一个有趣的问题是
Zip是否应该计数作为标准查询运算符，因为它是在 .NET 4 中引入的...Well they are "just regular (well, extension) methods" but they're also defined in the LINQ Standard Query Operators page on MSDN:
One interesting question is whether
Zipshould count as a standard query operator, given that it was introduced in .NET 4...