C# Beginner to advanced - Lesson 37 - Attributes

Attributes:

An attribute is a declarative tag that is used to convey information to runtime about the behaviors of various elements like classes, methods, structures, enumerators, assemblies etc. in your program.

Syntax for specifying an attribute is as follows: [Attributes(positional_parameters , name_parameter = value)]

Name of the attribute and its values are specified within the square brackets, before the element to which the attribute is applied.

Positional parameters specify the essential information and the name parameters specify the optional information.

Types of attributes:

The .Net Framework provides two types of attributes:

pre-defined attributes.

custom built attributes.

A few pre-defined attributes with in .Net Framework:

Attribute Usage

Conditional

Obsolete

WebMethod

Serializable

It is possible to customize the attribute using parameters

An attribute is a class that inherits from System.Attribute base class

Obsolete :

It is a predefined attribute, which marks a program entity that should not be used.

It enables you to inform the compiler to discard a particular target element.

For example : when a new method is being used in a class and if you still want to retain the old method in the class, you may mark it as obsolete by displaying a message the new method should be used, instead of the old method.

Syntax for Obsolete :

[Obsolete(message)]

The parameter message, is a string describing the reason why the item is obsolete and what to use instead.

[Obsolete(message, iserror)]

The parameter iserror, is a Boolean value. If its value is true, the compiler should treat the use of the item as an error. Default value is false (compiler generates a warning).

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