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Generic WeakReference

, 22 Dec 2007 CPOL
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A generic implementation of the WeakReference class

Introduction

In the .NET Framework, there is no generic implementation of the System.WeakReference class. This means that runtime casting has to be done by the developer which is error prone and repetitive work. I did this simple implementation to rid this problem. Of course, it does not help with the overhead that boxing introduces since it's still stored in an object variable in the base class. Hopefully future releases of the framework will contain a real generic WeakReference.

Using the Code

Just cut the code snippet below and paste it into your project to use it.

    /// <span class="code-SummaryComment"><summary></span>
    /// Represents a weak reference, which references an object while still allowing
    /// that object to be reclaimed by garbage collection.
    /// <span class="code-SummaryComment"></summary></span>
    /// <span class="code-SummaryComment"><typeparam name="T">The type of the object that is referenced.</typeparam></span>
    [Serializable]
    public class WeakReference<T>
        : WeakReference where T : class
    {
        /// <span class="code-SummaryComment"><summary></span>
        /// Initializes a new instance of the WeakReference{T} class, referencing
        /// the specified object.
        /// <span class="code-SummaryComment"></summary></span>
        /// <span class="code-SummaryComment"><param name="target">The object to reference.</param></span>
        public WeakReference(T target)
            : base(target)
        { }
        /// <span class="code-SummaryComment"><summary></span>
        /// Initializes a new instance of the WeakReference{T} class, referencing
        /// the specified object and using the specified resurrection tracking.
        /// <span class="code-SummaryComment"></summary></span>
        /// <span class="code-SummaryComment"><param name="target">An object to track.</param></span>
        /// <span class="code-SummaryComment"><param name="trackResurrection">Indicates when to stop tracking the object. </span>
        /// If true, the object is tracked
        /// after finalization; if false, the object is only tracked 
        /// until finalization.<span class="code-SummaryComment"></param></span>
        public WeakReference(T target, bool trackResurrection)
            : base(target, trackResurrection)
        { }
        protected WeakReference(SerializationInfo info, StreamingContext context)
            : base(info, context)
        { }
        /// <span class="code-SummaryComment"><summary></span>
        /// Gets or sets the object (the target) referenced by the 
        /// current WeakReference{T} object.
        /// <span class="code-SummaryComment"></summary></span>
        public new T Target
        {
            get
            {
                return (T)base.Target;
            }
           set
            {
                base.Target = value;
            }
        }
    }        

History

  • 21st December, 2007: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

RexNebular

Sweden Sweden
No Biography provided

Comments and Discussions

 
GeneralNice work PinmemberDavid McMinn29-Aug-08 6:41 

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