方括号之间的文字含义 [英] Meaning of text between square brackets

问题描述

我见过很多使用 [] 的 C# 程序，例如 [STAThread] 然后代码如下.另一个经典的例子是[DLLImport].

I have seen a lot of C# programs that use the [], for example [STAThread] and then the code follows. Another classic example is [DLLImport].

我知道 STAThread 是什么意思，但我的问题是方括号的意义是什么，本质上它们告诉编译器什么?

I know what STAThread means but my question is what is the significance of the square brackets, essentially what do they tell the compiler?

推荐答案

这是一个属性.属性是一种元数据形式，您可以将其附加到各种代码元素:类、方法、程序集等.

It's an attribute. Attributes are a form of metadata that you can attach to various code elements: classes, methods, assemblies etc.

某些属性对 C# 编译器具有特殊意义，例如 [Serializable] 可能会告诉编译器发出一些可以序列化类实例的代码(我说可能"，因为我不知道 C# 编译器的内部工作原理).

Some attributes have special meaning to the C# compiler, for instance the [Serializable] probably tells the compiler to emit some code that can serialize an instance of the class (I say 'probably' since I do not know the inner workings of the C# compiler).

您还可以创建自己的属性(通过继承 System.Attribute).使用反射，您可以在运行时从属性中提取信息.

You can also create your own attributes (by inheriting System.Attribute). Using reflection you could then at run-time extract information from the attributes.

一个简单的例子是创建一个属性来指定在显示对象属性时在 HTML 表单中使用哪种类型的输入字段.

A simple example would be to create an attribute to specify what kind of input field to use in a HTML form when displaying an object's property.

一些链接:

• 关于属性的书籍章节
• 属性概述 (MSDN)
• https://stackoverflow.com/search?q=C%23+attributes李>
• http://www.google.com/search?q=C%23+属性

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