ConstructionEnabledAttribute Class

Enables COM+ object construction support. This class cannot be inherited.


Namespace:  System.EnterpriseServices
Assembly:  System.EnterpriseServices (in System.EnterpriseServices.dll)

<AttributeUsageAttribute(AttributeTargets.Class, Inherited := True)> _
<ComVisibleAttribute(False)> _
Public NotInheritable Class ConstructionEnabledAttribute _
	Inherits Attribute

The ConstructionEnabledAttribute type exposes the following members.

Public methodConstructionEnabledAttributeInitializes a new instance of the ConstructionEnabledAttribute class and initializes the default settings for Enabled and Default.
Public methodConstructionEnabledAttribute(Boolean)Initializes a new instance of the ConstructionEnabledAttribute class, setting Enabled to the specified value.

Public propertyDefaultGets or sets a default value for the constructor string.
Public propertyEnabledGets or sets a value indicating whether COM+ object construction support is enabled.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)

For a list of initial property values for an instance of ConstructionEnabledAttribute, see the ConstructionEnabledAttribute constructor.

For more information about using attributes, see Extending Metadata Using Attributes.

The following code example demonstrates the use of this attribute to associate an object constructor string with a ServicedComponent class.

' Accept a constructor string.
<ConstructionEnabled()>  _
Public Class EmployeeInformation

    Inherits ServicedComponent

    ' The employee's user name and salary. 
    Private accountName As String 
    Private salary As Double = 0

    ' Get the employee's name. All users can call this method. 
    Public Function GetName() As String  
        Return accountName

    End Function 'GetName

    ' Set the employee's salary. Only managers can do this. 
    Public Sub SetSalary(ByVal ammount As Double) 
        If SecurityCallContext.CurrentCall.IsCallerInRole("Manager") Then
            salary = ammount
            Throw New UnauthorizedAccessException()
        End If 

    End Sub 'SetSalary

    ' Get the employee's salary. Only the employee and managers can do this. 
    Public Function GetSalary() As Double  
        If SecurityCallContext.CurrentCall.DirectCaller.AccountName = accountName OrElse SecurityCallContext.CurrentCall.IsCallerInRole("Manager") Then 
            Return salary
            Throw New UnauthorizedAccessException()
        End If 

    End Function 'GetSalary

    ' Use the constructor string. 
    ' This method is called when the object is instantiated. 
    Protected Overrides Sub Construct(ByVal constructorString As String) 
        accountName = constructorString

    End Sub 'Construct

End Class 'EmployeeInformation

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
© 2014 Microsoft