泛型弱引用(不继承 System.WeakReference)
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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);
}
}
}
{
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);
}
}
}