泛型弱引用(不继承 System.WeakReference)

代码
public   class  WeakReference < T >  : IDisposable
    {
        
private  GCHandle handle;
        
private   bool  trackResurrection;

        
public  WeakReference(T target) :  this (target,  false ) { }

        
public  WeakReference(T target,  bool  trackResurrection)
        {
            
this .trackResurrection  =  trackResurrection;
            
this .Target  =  target;
        }

        
~ WeakReference()
        {
            Dispose();
        }

        
public   void  Dispose()
        {
            handle.Free();
            GC.SuppressFinalize(
this );
        }

        
public   virtual   bool  IsAlive
        {
            
get  {  return  (handle.Target  !=   null ); }
        }

        
public   virtual   bool  TrackResurrection
        {
            
get  {  return   this .trackResurrection; }
        }

        
public   virtual  T Target
        {
            
get
            {
                
object  o  =  handle.Target;
                
if  ((o  ==   null ||  ( ! (o  is  T)))
                    
return   default (T);
                
else
                    
return  (T)o;
            }
            
set
            {
                handle 
=  GCHandle.Alloc(value,  this .trackResurrection  ?  GCHandleType.WeakTrackResurrection : GCHandleType.Weak);
            }
        }
    }

 

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