如果没有Dispose方法，这个类如何实现IDisposable？

Question

FtpWebResponse implements IDisposable, but it doesn't have a Dispose method. How is that possible?

Answer 1

它在基类WebResponse中实现，请参阅http://msdn.microsoft.com/en-us/library/system.net.webresponse_methods.aspx

Answer 2

It does have the Dispose method through inheritance, but it is an explicit implementation. To call it, you would have to use

((IDisposable)myObject).Dispose();

Or, of course, just wrap it in a using block, as it does the explicit call for you.

Answer 3

When you implement an interface explicitly, you won't get the method in the listing. You will have to cast that object to implemented interface to get access to that method.

public class MyClass : IDisposable
{
    void IDisposable.Dispose()
    {
        throw new NotImplementedException();
    }
}

Reference : http://msdn.microsoft.com/en-us/library/ms173157.aspx

Answer 4

It's implemented in the base class WebResponse

void IDisposable.Dispose()
{
try
{
    this.Close();
    this.OnDispose();
}
catch
{
}
}

alt text http://img227.imageshack.us/img227/2428/redgatesnetreflector.png

Answer 5

它继承自System.Net.WebResponse ，它实现了这些方法。