调用 C# 类声明之前的方括号中的内容是什么？
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What is the thing in square brackets that comes before a C# class declaration called?
提问by Bit Hunter
What is the [something]in
什么是[something]在
[something]
public class c1 {
}
called in C#? What does it do?
在 C# 中调用？它有什么作用？
回答by JaredPar
This is known as an attribute application / usage. It associates an instance of a given Attributewith a type. These are user definitable items. For example
这称为属性应用程序/用法。它将给定的实例Attribute与类型相关联。这些是用户可定义的项目。例如
[AttributeUsage(AttributeTargets.All)]
public class ExampleAttribute : System.Attribute {
public ExampleAttribute() { }
}
This is an attribute which can be applied on ever place an attribute is legal
这是一个属性，可以应用于任何属性合法的地方
// Assembly level
[assembly: Example]
// Class
[Example]
public class C1 {
// Field
[Example]
public int m_field;
// Method
[Example]
public void Test() { }
}
More locations are possible but hopefully this gets the general idea across. You may also want to check out this tutorial
更多的位置是可能的，但希望这能传达总体思路。您可能还想查看本教程
回答by Sam Axe
Its called an Attribute. A class that ends in "Attribute", and inherits from Attribute:
它被称为一个属性。以“Attribute”结尾的类，并继承自 Attribute：
public class SomethingAttribute : Attribute {
}
If you are creating one, be sure to look up the AttributeUsageAttributeclass.
如果您正在创建一个，请务必查找AttributeUsageAttribute类。
回答by Dmitry Savy
C# Attributes. Please see this documentation.
C# 属性。请参阅此文档。
