public class SampleClass : IDisposable     {         //演示创建一个非托管资源         private IntPtr nativeResource = Marshal.AllocHGlobal(100);         //演示创建一个托管资源         private AnotherResource managedResource = new AnotherResource();         private bool disposed = false;         /// <summary>         /// 实现IDisposable中的Dispose方法         /// </summary>         public void Dispose()         {             //必须为true             Dispose(true);             //通知垃圾回收机制不再调用终结器（析构器）             GC.SuppressFinalize(this);         }         /// <summary>         /// 不是必要的，提供一个Close方法仅仅是为了更符合其他语言（如C++）的规范         /// </summary>         public void Close()         {             Dispose();         }         /// <summary>         /// 必须，以备程序员忘记了显式调用Dispose方法         /// </summary>         ~SampleClass()         {             //必须为false             Dispose(false);         }         /// <summary>         /// 非密封类修饰用protected virtual         /// 密封类修饰用private         /// </summary>         /// <param name="disposing"></param>         protected virtual void Dispose(bool disposing)         {             if (disposed)             {                 return;             }             if (disposing)             {                 // 清理托管资源                 if (managedResource != null)                 {                     managedResource.Dispose();                     managedResource = null;                 }             }             // 清理非托管资源             if (nativeResource != IntPtr.Zero)             {                 Marshal.FreeHGlobal(nativeResource);                 nativeResource = IntPtr.Zero;             }             //让类型知道自己已经被释放             disposed = true;         }         public void SamplePublicMethod()         {             if (disposed)             {                 throw new ObjectDisposedException("SampleClass", "SampleClass is disposed");             }             //省略         }     }