dispose

.net 对象释放不会回收非托管资源，需实现dispose 模式

代码如下

 

        class a : IDisposable
        {
                bool disposed;

                ~a()
                {
                        Dispose(false);
                }

IDisposable 成员#region IDisposable 成员

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

                #endregion

                protected virtual void Dispose(bool disposing)
                {
                        if (!disposed)
                        {
                                if (disposing)
                                {

                                }
                                disposed = true;
                        }
                }

                public void f()
                {
                        if (disposed)
                                throw new ObjectDisposedException("this");
                }

                public void Close()
                {
                        Dispose();
                }
    
        }

        class b : a
        {
                bool disposed;

                ~b()
                {
                        Dispose(false);
                }

                protected override void Dispose(bool disposing)
                {
                        try
                        {
                                if (!disposed)
                                {
                                        if (disposing)
                                        {

                                        }
                                        disposed = true;
                                }
                        }
                        finally
                        {
                                base.Dispose(disposing);
                        }
                }
        }

 

重点：

用户主动释放需释放托管＋非托管资源，且通知 GC 垃圾收走了，别来收了

 

析构释放仅回收非托管资源

 

功能实现需考察对象是否释放

 

使用语境下 close 或许是个更好的名字

 

传播该模式到派生类