C#中Dispose和Close的区别

using System; 

namespace ConsoleApplication

{

abstract class MyStream : IDisposable

{

public MyStream()

{

m_unmanagedResource = Marshal.AllocCoTaskMem(100);

m_bitmap = new Bitmap(50, 50);

}



#region IDisposable Members

void IDisposable.Dispose()

{

Dispose(true);

GC.SuppressFinalize(this);

}



protected virtual void Dispose(bool isDisposing)

{

if (!m_disposed)

{

if (isDisposing)

{

m_bitmap.Dispose();

}

Marshal.FreeCoTaskMem(m_unmanagedResource);

m_disposed = true;

}

}



public void Close()

{

((IDisposable)this).Dispose();

}



~MyStream()

{

Dispose(false);            

}



private IntPtr m_unmanagedResource;     // Unmanaged resource

private Bitmap m_bitmap;                // IDisposable managed resources

private bool m_disposed;



#endregion

}



class MyDerivedStream : MyStream

{

public MyDerivedStream()

{

m_anotherMemory = Marshal.AllocCoTaskMem(20);

m_anotherImage = new Bitmap(24, 24);

}



protected override void Dispose(bool isDisposing)

{

if (!m_disposed)

{

if (isDisposing)

{

m_anotherImage.Dispose();

}



Marshal.FreeCoTaskMem(m_anotherMemory);

base.Dispose(isDisposing);

m_disposed = true;

}

}



public static void Main(string[] args)

{

MyStream aStream = new MyDerivedStream();



aStream.Close();          // Allowed

// aStream.Dispose();    // Cannot compile



((IDisposable)aStream).Dispose();     // Allowed



//

//  This one works as well, because newStream calls 
the explicit implemented

//  IDisposable.Dispose method

//

using (MyStream newStream = new MyDerivedStream())

{

//

//  Do something

//

}

}



private IntPtr m_anotherMemory;

private Bitmap m_anotherImage;

private bool m_disposed;

}

}