ConstructionEnabledAttribute Class
 
System_CAPS_noteNote

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

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

SystemObject
   SystemAttribute
    System.EnterpriseServicesConstructionEnabledAttribute

[AttributeUsageAttribute(AttributeTargets.Class, Inherited = true)]
[ComVisibleAttribute(false)]
public sealed class ConstructionEnabledAttribute : Attribute
[AttributeUsageAttribute(AttributeTargets::Class, Inherited = true)]
[ComVisibleAttribute(false)]
public ref class ConstructionEnabledAttribute sealed : Attribute
[<Sealed>]
[<AttributeUsageAttribute(AttributeTargets.Class, Inherited = true)>]
[<ComVisibleAttribute(false)>]
type ConstructionEnabledAttribute = 
    class
        inherit Attribute
    end
<AttributeUsageAttribute(AttributeTargets.Class, Inherited := True)>
<ComVisibleAttribute(False)>
Public NotInheritable Class ConstructionEnabledAttribute
	Inherits Attribute
NameDescription
System_CAPS_pubmethod ConstructionEnabledAttribute

Initializes a new instance of the ConstructionEnabledAttribute class and initializes the default settings for and .

System_CAPS_pubmethod ConstructionEnabledAttribute

Initializes a new instance of the ConstructionEnabledAttribute class, setting to the specified value.

NameDescription
System_CAPS_pubproperty

Gets or sets a default value for the constructor string.

System_CAPS_pubproperty

Gets or sets a value indicating whether COM+ object construction support is enabled.

System_CAPS_pubproperty

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

NameDescription
System_CAPS_pubmethod Equals

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod IsDefaultAttribute

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethod Match

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides 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 : 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 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 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;
   }
};
.NET Framework
Available since 1.1

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

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