基础才是重中之重~C#中标准的IDispose模式

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IDispose模式在C++中用的很多，用来清理资源，而在C#里，资源分为托管和非托管两种，托管资源是由C#的CLR帮助我们清理的，它是通过调用对象的析构函数完成的对象释放工作，而对于非托管系统来说，则需要我们自己来释放，例如数据库连接对象，这就需要我们手动去调用它的Dispose()方法来实现对象它的释放，事实上，Dispose()内容到底做了什么事，我们并不清楚，当然这就是面向对象，它不希望你关系实现的细节，呵！

对于我们开发人员来说，在了解它怎么用之后，总会对它如何实现的产生兴趣，下面，我将把C#里实现IDispose模式的代码展现出来，大家一起来学习一下，事实上，它的使用场合也很多的，当我们手动对网站，数据库作封装时，都会用的到，下面看一下代码:

 /// <summary>
    /// 实现IDisposable，对非托管系统进行资源回收
    /// </summary>
    public class IDisplosePattern : IDisposable
    {
        public void Dispose()
        {
            this.Dispose(true);////释放托管资源
            GC.SuppressFinalize(this);//请求系统不要调用指定对象的终结器. //该方法在对象头中设置一个位，系统在调用终结器时将检查这个位
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!_isDisposed)//_isDisposed为false表示没有进行手动dispose
            {
                if (disposing)
                {
                    //清理托管资源
                }
                //清理非托管资源
            }
            _isDisposed = true;
        }

        private bool _isDisposed;

        ~IDisplosePattern()
        {
            this.Dispose(false);//释放非托管资源，托管资源由终极器自己完成了
        }
    }

通过上面的代码，我们知道了，对于托管系统（C#的CLR为我们管理的），直接通过~IDisplosePattern()方法进行释放，而~IDisplosePattern()这个方法何时被调用，我们是不知道的，因为它是由CLR帮助我们调用的，而我们手动进行dispose方法时，它会调用dispose(true)这个重载方法，它会帮助我们清理托管和非托管资源，如图：

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vjMNrkOC4Gqdh98dme885zMMw4SK57mqCLCdnd/rJi2mT49PY3OEMaxz/jpsm0d/zp7bc4jd5b9iqAZ7VLHC//fs1MW7pJHRkdKLfmuw+9d967uDWsW22wYSxUsSuTcs7tFne9//nbbbCXUvfvFbzfZeP8up/1X96Or/stXgz8Dp8uCGPgWR3rbSCv/b+QtPiXgQB2c6Q4nv9yjbdqAHg6m+I4fTGLcASAfRypOgaAJ0YcA0ATiGMAaAJxDABNII4BoAn/A4zmJEGzbPeKAAAAAElFTkSuQmCC" 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