代表的@前缀是否具有特殊含义？ [英] Does the @ prefix for delegates have any special meaning?

问题描述

几次我看到ReSharper生成的代码如下：

Several times I've seen ReSharper generate code that looks like this:

delegate void myHandler(int i);
myHandler myHandlerContainer;
...
foreach (Delegate @delegate in myHandlerContainer.GetInvocationList())
{...}

@delegate 中的 @ 是否赋予该变量任何特殊的语义含义？

或是

Does the '@' in @delegate give that variable any special semantic meaning?
Or is it just a convention I didn't encounter before?

推荐答案

MSDN的一些更多细节：

Some more details from MSDN:

前缀@允许使用
关键字作为标识符，当与其他
编程语言连接时，这是
有用。字符@
实际上不是
标识符的一部分，因此标识符可能是
，在其他语言中看起来是一个正常的
标识符，没有前缀。带有@前缀的
标识符称为
一个逐字标识符。对于不是
关键字的标识符，可以使用@
前缀，但对于风格来说，强烈的
不鼓励。

The prefix "@" enables the use of keywords as identifiers, which is useful when interfacing with other programming languages. The character @ is not actually part of the identifier, so the identifier might be seen in other languages as a normal identifier, without the prefix. An identifier with an @ prefix is called a verbatim identifier. Use of the @ prefix for identifiers that are not keywords is permitted, but strongly discouraged as a matter of style.

从 C＃语言规范：2.4 .2标识符。

因此，使用'@'进行前缀可以允许从一个名为delegate的类派生，可以在C＃中使用另一种语言编写的库中定义。

Prefixing with '@' therefore allows e.g. to derive from a class named "delegate" which might be defined in a library written in another language than C#.

在任何其他情况下，我不建议使用此语法而是构成与C＃关键字（例如，值而不是值）不同的标识符，以增加代码的可读性，避免混淆是否有任何特殊的含义。

In any other case I would not recommend to use this syntax and rather make up identifiers different from the C# keywords (e.g. valu instead of value) to increase code readability and avoid confusion whether there is any special meaning attached to it.

另外一个有趣的事实就是在这里提到的变量命名：

There is also another interesting fact about variable naming mentioned there:

包含两个连续的
下划线字符（U + 005F）的标识符是
保留供
实现使用。例如，
实现可以提供扩展的
关键字，以两个
下划线开头。

Identifiers containing two consecutive underscore characters (U+005F) are reserved for use by the implementation. For example, an implementation might provide extended keywords that begin with two underscores.

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