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// ****************************************************************************
// <copyright file="WeakAction.cs" company="GalaSoft Laurent Bugnion">
// Copyright © GalaSoft Laurent Bugnion 2009-2011
// </copyright>
// ****************************************************************************
// <author>Laurent Bugnion</author>
// <email>laurent@galasoft.ch</email>
// <date>18.9.2009</date>
// <project>GalaSoft.MvvmLight</project>
// <web>http://www.galasoft.ch</web>
// <license>
// See license.txt in this solution or http://www.galasoft.ch/license_MIT.txt
// </license>
// ****************************************************************************
using System;
namespace CBR.Core.Helpers
{
/// <summary>
/// Stores an <see cref="Action" /> without causing a hard reference
/// to be created to the Action's owner. The owner can be garbage collected at any time.
/// </summary>
////[ClassInfo(typeof(Messenger))]
public class WeakAction
{
private readonly Action _action;
private WeakReference _reference;
/// <summary>
/// Initializes a new instance of the <see cref="WeakAction" /> class.
/// </summary>
/// <param name="target">The action's owner.</param>
/// <param name="action">The action that will be associated to this instance.</param>
public WeakAction(object target, Action action)
{
_reference = new WeakReference(target);
_action = action;
}
/// <summary>
/// Gets the Action associated to this instance.
/// </summary>
public Action Action
{
get
{
return _action;
}
}
/// <summary>
/// Gets a value indicating whether the Action's owner is still alive, or if it was collected
/// by the Garbage Collector already.
/// </summary>
public bool IsAlive
{
get
{
if (_reference == null)
{
return false;
}
return _reference.IsAlive;
}
}
/// <summary>
/// Gets the Action's owner. This object is stored as a <see cref="WeakReference" />.
/// </summary>
public object Target
{
get
{
if (_reference == null)
{
return null;
}
return _reference.Target;
}
}
/// <summary>
/// Executes the action. This only happens if the action's owner
/// is still alive.
/// </summary>
public void Execute()
{
if (_action != null
&& IsAlive)
{
_action();
}
}
/// <summary>
/// Sets the reference that this instance stores to null.
/// </summary>
public void MarkForDeletion()
{
_reference = null;
}
}
}
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WPF and MVVM fan, I practice C # in all its forms from the beginning of the NET Framework without mentioning C ++ / MFC and other software packages such as databases, ASP, WCF, Web & Windows services, Application, and now Core and UWP.
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