ConstructionEnabledAttribute Class
Enables COM+ object construction support. This class cannot be inherited.
Assembly: System.EnterpriseServices (in System.EnterpriseServices.dll)
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;
}
};
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.