SynchronizationAttribute Class

Definition

Namespace:

System.EnterpriseServices

Assembly:

System.EnterpriseServices.dll

Sets the synchronization value of the component. This class cannot be inherited.

public ref class SynchronizationAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(false)]
public sealed class SynchronizationAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)>]
[<System.Runtime.InteropServices.ComVisible(false)>]
type SynchronizationAttribute = class
    inherit Attribute

Public NotInheritable Class SynchronizationAttribute
Inherits Attribute

Inheritance

Object

Attribute

SynchronizationAttribute

Attributes

AttributeUsageAttribute ComVisibleAttribute

Examples

The following code example demonstrates the use of the SynchronizationAttribute type.

using System;
using System.EnterpriseServices;
using System.Reflection;

// References:
// System.EnterpriseServices

// This is equivalent to [Synchronization(SynchronizationOption.Required)].
[Synchronization]
public class SynchronizationAttribute_Ctor : ServicedComponent
{
}

[Synchronization(SynchronizationOption.Disabled)]
public class SynchronizationAttribute_Ctor_SynchronizationOption : ServicedComponent
{
}

[Synchronization(SynchronizationOption.RequiresNew)]
public class SynchronizationAttribute_Value : ServicedComponent
{
    public void ValueExample()
    {
        // Get the SynchronizationAttribute applied to the class.
        SynchronizationAttribute attribute =
            (SynchronizationAttribute)Attribute.GetCustomAttribute(
            this.GetType(),
            typeof(SynchronizationAttribute),
            false);

        // Display the value of the attribute's Value property.
        Console.WriteLine("SynchronizationAttribute.Value: {0}",
            attribute.Value);
    }
}

Imports System.EnterpriseServices
Imports System.Reflection


' References:
' System.EnterpriseServices

' This is equivalent to [Synchronization(SynchronizationOption.Required)].
<Synchronization()>  _
Public Class SynchronizationAttribute_Ctor
    Inherits ServicedComponent
End Class

<Synchronization(SynchronizationOption.Disabled)>  _
Public Class SynchronizationAttribute_Ctor_SynchronizationOption
    Inherits ServicedComponent
End Class

<Synchronization(SynchronizationOption.RequiresNew)>  _
Public Class SynchronizationAttribute_Value
    Inherits ServicedComponent
    
    Public Sub ValueExample() 
        ' Get the SynchronizationAttribute applied to the class.
        Dim attribute As SynchronizationAttribute = CType(Attribute.GetCustomAttribute(Me.GetType(), GetType(SynchronizationAttribute), False), SynchronizationAttribute)
        
        ' Display the value of the attribute's Value property.
        MsgBox("SynchronizationAttribute.Value: " & attribute.Value)
    
    End Sub
End Class

Remarks

Both transaction and just-in-time (JIT) activation enable synchronization automatically.

For more information about using attributes, see Attributes.

Applying SynchronizationAttribute to a context-bound object results in the creation of a wait handle and auto reset event, which are not deterministically garbage collected. Therefore, you should not create a large number of context-bound objects marked with the SynchronizationAttribute within a short time period.

Constructors

SynchronizationAttribute()	Initializes a new instance of the SynchronizationAttribute class with the default SynchronizationOption.
SynchronizationAttribute(SynchronizationOption)	Initializes a new instance of the SynchronizationAttribute class with the specified SynchronizationOption.

Properties

TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)
Value	Gets the current setting of the Value property.

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
GetHashCode()	Returns the hash code for this instance. (Inherited from Attribute)
GetType()	Gets the Type of the current instance. (Inherited from Object)
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)
Match(Object)	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)	Provides access to properties and methods exposed by an object. (Inherited from Attribute)