Specifies the usage of another attribute class. This class cannot be inherited.
Assembly: mscorlib (in mscorlib.dll)
Thetype exposes the following members.
|AllowMultiple||Gets or sets a Boolean value indicating whether more than one instance of the indicated attribute can be specified for a single program element.|
|Inherited||Gets or sets a Boolean value indicating whether the indicated attribute can be inherited by derived classes and overriding members.|
|ValidOn||Gets a set of values identifying which program elements that the indicated attribute can be applied to.|
|Equals||Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Returns the hash code for this instance. (Inherited from Attribute.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|Match||When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
When you are defining your own attribute class, you can control the manner in which it is used by placing an on your attribute class. The indicated attribute class must derive from Attribute, either directly or indirectly.
Attribute classes have positional and named parameters. Each public constructor for an attribute class defines a valid sequence of positional parameters for that class. Named parameters are defined by the non-static, public, and read-write fields or properties of the attribute class.
The three properties of are set by defining the following parameters:
This positional parameter specifies the program elements that the indicated attribute can be placed on. The set of all possible elements that you can place an attribute on is listed in the AttributeTargets enumeration. You can combine several AttributeTargets values using a bitwise OR operation to get the desired combination of valid program elements.
This named parameter specifies whether the indicated attribute can be specified more than once for a given program element.
This named parameter specifies whether the indicated attribute can be inherited by derived classes and overriding members.
The definition of the DispId attribute illustrates the use of a bitwise OR operation to combine several AttributeTargets values.
Imports System <AttributeUsage(AttributeTargets.Method _ Or AttributeTargets.Field _ Or AttributeTargets.Property)> _ Public Class DispIdAttribute Inherits System.Attribute Public Sub New(ByVal value As Integer) ' . . . End Sub Public ReadOnly Property Value() As Integer Get ' . . . Return 0 End Get End Property End Class
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