ConstructionEnabledAttribute Class

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

System.Object
  System.Attribute
    System.EnterpriseServices.ConstructionEnabledAttribute

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

[AttributeUsageAttribute(AttributeTargets.Class, Inherited = true)]
[ComVisibleAttribute(false)]
public sealed class ConstructionEnabledAttribute : Attribute

The ConstructionEnabledAttribute type exposes the following members.

  NameDescription
Public methodConstructionEnabledAttribute()Initializes 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.
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  NameDescription
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.)
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  NameDescription
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.)
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  NameDescription
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.)
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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;
    }

}

.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.
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