.NET Framework Class Library
ConstructionEnabledAttribute Class

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

Inheritance Hierarchy
SystemObject
   SystemAttribute
    System.EnterpriseServicesConstructionEnabledAttribute

Namespace:   System.EnterpriseServices
Assembly:  System.EnterpriseServices (in System.EnterpriseServices.dll)
Syntax
<[%$TOPIC/348ktbet_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/348ktbet_en-us_VS_110_2_0_0_0_1%].Class, Inherited := True)> _
<[%$TOPIC/348ktbet_en-us_VS_110_2_0_0_0_2%](False)> _
Public NotInheritable Class ConstructionEnabledAttribute _
	Inherits [%$TOPIC/348ktbet_en-us_VS_110_2_0_0_0_3%]
[[%$TOPIC/348ktbet_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/348ktbet_en-us_VS_110_2_0_1_0_1%].Class, Inherited = true)]
[[%$TOPIC/348ktbet_en-us_VS_110_2_0_1_0_2%](false)]
public sealed class ConstructionEnabledAttribute : [%$TOPIC/348ktbet_en-us_VS_110_2_0_1_0_3%]
[[%$TOPIC/348ktbet_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/348ktbet_en-us_VS_110_2_0_2_0_1%]::Class, Inherited = true)]
[[%$TOPIC/348ktbet_en-us_VS_110_2_0_2_0_2%](false)]
public ref class ConstructionEnabledAttribute sealed : public [%$TOPIC/348ktbet_en-us_VS_110_2_0_2_0_3%]
[<[%$TOPIC/348ktbet_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/348ktbet_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/348ktbet_en-us_VS_110_2_0_3_0_2%].Class, Inherited = true)>]
[<[%$TOPIC/348ktbet_en-us_VS_110_2_0_3_0_3%](false)>]
type ConstructionEnabledAttribute =  
    class 
        inherit [%$TOPIC/348ktbet_en-us_VS_110_2_0_3_0_4%] 
    end

The ConstructionEnabledAttribute type exposes the following members.

Constructors
  NameDescription
Public method ConstructionEnabledAttributeInitializes a new instance of the ConstructionEnabledAttribute class and initializes the default settings for Enabled and Default.
Public method ConstructionEnabledAttribute(Boolean)Initializes a new instance of the ConstructionEnabledAttribute class, setting Enabled to the specified value.
Top
Properties
  NameDescription
Public property DefaultGets or sets a default value for the constructor string.
Public property EnabledGets or sets a value indicating whether COM+ object construction support is enabled.
Public property TypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Top
Methods
  NameDescription
Public method EqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public method GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public method MatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public method ToStringReturns a string that represents the current object. (Inherited from Object.)
Top
Explicit Interface Implementations
  NameDescription
Explicit interface implemetation Private method _AttributeGetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeInvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
Top
Remarks

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.

Examples

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
        Else 
            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
        Else 
            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
// Accept a constructor string.
[ConstructionEnabled]

public class EmployeeInformation : ServicedComponent
{

    // The employee's user name and salary. 
    private string accountName;
    private double salary = 0;


    // Get the employee's name. All users can call this method. 
    public string GetName ()
    {
      return(accountName);
    }


    // Set the employee's salary. Only managers can do this. 
    public void SetSalary (double ammount)
    {
        if (SecurityCallContext.CurrentCall.IsCallerInRole("Manager"))
        {
            salary = ammount;
        }
        else
        {
            throw new UnauthorizedAccessException();
        }
    }


    // Get the employee's salary. Only the employee and managers can do this. 
    public double GetSalary ()
    {
        if ( SecurityCallContext.CurrentCall.DirectCaller.AccountName == accountName ||
             SecurityCallContext.CurrentCall.IsCallerInRole("Manager") )
        {
            return(salary);
        }
        else
        {
          throw new UnauthorizedAccessException();
        }
    }


    // Use the constructor string. 
    // This method is called when the object is instantiated. 
    protected override void Construct (string constructorString)
    {
        accountName = constructorString;
    }

}
// Accept a constructor string.

[ConstructionEnabled]
public ref class EmployeeInformation: public ServicedComponent
{
private:

   // The employee's user name and salary.
   String^ accountName;
   double salary;

public:

   // Get the employee's name. All users can call this method.
   String^ GetName()
   {
      return (accountName);
   }

   // Set the employee's salary. Only managers can do this. 
   void SetSalary( double ammount )
   {
      if ( SecurityCallContext::CurrentCall->IsCallerInRole( "Manager" ) )
      {
         salary = ammount;
      }
      else
      {
         throw gcnew UnauthorizedAccessException;
      }
   }

   // Get the employee's salary. Only the employee and managers can do this. 
   double GetSalary()
   {
      if ( SecurityCallContext::CurrentCall->DirectCaller->AccountName == accountName || SecurityCallContext::CurrentCall->IsCallerInRole( "Manager" ) )
      {
         return (salary);
      }
      else
      {
         throw gcnew UnauthorizedAccessException;
      }
   }

protected:
   // Use the constructor string. 
   // This method is called when the object is instantiated. 
   virtual void Construct( String^ constructorString ) override
   {
      accountName = constructorString;
   }
};
Version Information

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Platforms

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.

Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.