C# 0 The Complete Reference

a

, 1.1 to 

b

, and “hello” to 

c

 because of the position (i.e., order) of the arguments. 

However, for an attribute, you can also create 

named parameters,

 which can be assigned initial 

values by using their name. In this case, it is the name of the parameter, not its position, that 

is important.

A named parameter is supported by either a public field or property, which must be 

read-write and nonstatic. Any such field or property is automatically able to be used as a 

named parameter. A named parameter is given a value by an assignment statement that is 

located within the argument list when the attribute’s constructor is invoked. Here is the 

general form of an attribute specification that includes named parameters:

[

attrib

(

positional-param-list

,

named-param1

 = 

value

,

named-param2

 = 

value

, ...)]

The positional parameters (if they exist) come first. Next, each named parameter is assigned 

a value. The order of the named parameters is not important. Named parameters do not 

need to be given a value. In this case, their default value will be used.

To understand how to use a named parameter, it is best to work through an example. 

Here is a version of