类名的括号在C＃类中的含义是什么

Question

As a beginner in the world of .NET and C# I dont know what does it mean when I see the following syntax at the beginning of a .CS file ? I am confused about the meaning of the brackets around the names? Thanks in advance for your help.

   [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "55.555.5.555")]
   [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "5.5.34444.55")]
   [System.SerializableAttribute()]
   [System.Diagnostics.DebuggerStepThroughAttribute()]
   [System.ComponentModel.DesignerCategoryAttribute("code")]

Answer 1

What you're seeing there is what is known as an 'Attribute'. This describes something about the class, and can allow other pieces of code to interact with that class in specific ways.

You can find out more about attributes here: http://msdn.microsoft.com/en-us/library/aa288454(v=vs.71).aspx

Answer 2

In the examples you showed, they're used to designate attributes above the declaration of the entity to which they apply:

http://msdn.microsoft.com/en-us/library/z0w1kczw.aspx

Answer 3

These are Attributes .

Attributes provide a powerful method of associating metadata, or declarative information, with code (assemblies, types, methods, properties, and so forth). After an attribute is associated with a program entity, the attribute can be queried at run time by using a technique called reflection.

Answer 4

They are called Attributes and provide metadata for your classes.

For example, the SerializableAttribute lets some classes know that your object can be written to disk or sent over a network connection to another program.