'[]' 之间的代码是什么以及它的作用是什么？
What is code between '[]' and what does it do?
我学习 C# 有一段时间了。写了一些程序等。我没有处理过高级概念，但是在研究其他人的代码时，我注意到有些代码行我不明白它们为什么在那里。在这个例子中，我知道我知道它正在导入一个 DLL，但我不确定这行代码叫什么？是声明吗？我在哪里可以了解更多关于它们的信息？
在不知道它叫什么的情况下试图了解它是不可能的:)
示例：
[DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true)]
static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, IntPtr lParam);
but am not sure what this line of code is called?
[ ] 中的任何内容都是 Attribute 提供编译器或 运行 程序使用反射获得 insights/hints 提供 元 对象在其（[]）声明之后的视图。
有关介绍，请参阅 Attributes Tutorial。
也许this link对你有用。
页面中关于属性是什么的相关段落在这里：
Attribute Basics
Attributes are generally applied physically in front of type and type
member declarations. They're declared with square brackets, "[" and
"]", surrounding the attribute such as the following ObsoleteAttribute
attribute:
[ObsoleteAttribute] The "Attribute" part of the attribute name is
optional. So the following is equivalent to the attribute above:
[Obsolete] You'll notice that the attribute is declared with only the
name of the attribute, surrounded by square brackets. Many attributes
have parameter lists, that allow inclusion of additional information
that customizes a program even further. Listing 16.1 shows various
ways of how to use the ObsoleteAttribute attribute.
在 Microsoft's MSDN page 上，有对该特定属性的使用说明。
The DllImport attribute is very useful when reusing existing unmanaged
code in a managed application. For instance, your managed application
might need to make calls to the unmanaged WIN32 API.
如需更深入的信息，请在 Google 或 canonical sources on MSDN 上进行简单搜索，这将说明用途、用法和代码示例。
我学习 C# 有一段时间了。写了一些程序等。我没有处理过高级概念，但是在研究其他人的代码时，我注意到有些代码行我不明白它们为什么在那里。在这个例子中，我知道我知道它正在导入一个 DLL，但我不确定这行代码叫什么？是声明吗？我在哪里可以了解更多关于它们的信息？
在不知道它叫什么的情况下试图了解它是不可能的:)
示例：
[DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true)]
static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, IntPtr lParam);
but am not sure what this line of code is called?
[ ] 中的任何内容都是 Attribute 提供编译器或 运行 程序使用反射获得 insights/hints 提供 元 对象在其（[]）声明之后的视图。
有关介绍，请参阅 Attributes Tutorial。
也许this link对你有用。
页面中关于属性是什么的相关段落在这里：
Attribute Basics
Attributes are generally applied physically in front of type and type member declarations. They're declared with square brackets, "[" and "]", surrounding the attribute such as the following ObsoleteAttribute attribute:
[ObsoleteAttribute] The "Attribute" part of the attribute name is optional. So the following is equivalent to the attribute above:
[Obsolete] You'll notice that the attribute is declared with only the name of the attribute, surrounded by square brackets. Many attributes have parameter lists, that allow inclusion of additional information that customizes a program even further. Listing 16.1 shows various ways of how to use the ObsoleteAttribute attribute.
在 Microsoft's MSDN page 上，有对该特定属性的使用说明。
The DllImport attribute is very useful when reusing existing unmanaged code in a managed application. For instance, your managed application might need to make calls to the unmanaged WIN32 API.
如需更深入的信息，请在 Google 或 canonical sources on MSDN 上进行简单搜索，这将说明用途、用法和代码示例。