Export (0) Print
Expand All

ConstructionEnabledAttribute Class

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

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

'Declaration
<AttributeUsageAttribute(AttributeTargets.Class, Inherited := True)> _
<ComVisibleAttribute(False)> _
Public NotInheritable Class ConstructionEnabledAttribute _
	Inherits Attribute
'Usage
Dim instance As ConstructionEnabledAttribute

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
        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 __gc class EmployeeInformation : public ServicedComponent
{
    // The employee's user name and salary.
private:
    String* accountName;
    double salary;


    // 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(S"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(S"Manager") )
        {
            return(salary);
        }
        else
        {
          throw new UnauthorizedAccessException();
        }
    }


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

};

System.Object
  System.Attribute
    System.EnterpriseServices.ConstructionEnabledAttribute

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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

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

Community Additions

ADD
Show:
© 2014 Microsoft