How does this class implement IDisposable if it do

问题:

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

回答1:

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.

回答2:

Its implemented in the base class WebResponse, see http://msdn.microsoft.com/en-us/library/system.net.webresponse_methods.aspx

回答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

回答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

回答5:

It inherits from System.Net.WebResponse which implements these methods.