Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Conversion from base classes

Posted on 2004-08-26
6
Medium Priority
?
172 Views
Last Modified: 2010-04-15
I have written a class, ObjectBase, that is the base for two other classes, OrganizationalPerson and OrganizationalUnit.  OrganizationalUnit is an Enumerable class that can either contain a list of OrganizationalPersons or other OrganizationalUnits.   The following is my implementation of Current:

public object Current
{
      get { return new ObjectBase(_searchResult[_index].GetDirectoryEntry()); }
}

Everything works until I try the following:

foreach(OrganizationalUnit o in ou)
      Response.Write(String.Format("{0}<br>", o.name));

I get a "Specified Cast is not valid" error when trying to run the above code.  When I try to write an implicit or an explicit conversion, the code will not compile.  How can I accomplish this?
0
Comment
Question by:dirtdart
6 Comments
 
LVL 3

Assisted Solution

by:GrumbleBot
GrumbleBot earned 750 total points
ID: 11909087
You want variable o to be Object?

if so you would want

foreach(Object o in ou)
    Response.Write(String.Format("{0}<br>", o.Name.ToString()));

Hope this helps
Good luck
0
 
LVL 10

Accepted Solution

by:
eternal_21 earned 750 total points
ID: 11909302
** NOT FOR POINTS ***

  foreach(ObjectBase o in ou)
    Response.Write(String.Format("{0}<br>", o.Name.ToString()));

* Note that it is ObjectBase, not object (assuming that ObjectBase.Name is a valid method).
0
 
LVL 1

Expert Comment

by:johanjohansson
ID: 11910518
Why do you use the 'new' keyword when getting an item from the list? Why not

public object Current
{
     get { return _searchResult[_index].GetDirectoryEntry(); }
}

or

public ObjectBase Current
{
     get { return (ObjectBase)_searchResult[_index].GetDirectoryEntry(); }
}
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 5

Author Comment

by:dirtdart
ID: 11911184
johanjohansson:  That is done because _searchResult[_index].GetDirectoryEntry() does not cast directy to ObjectBase.  It is passed as a parameter to the constructor, and all information loaded into the ObjectBase through it.
0
 
LVL 5

Author Comment

by:dirtdart
ID: 11911206
GrumbleBot:  No, I want o to be type OrganizationalUnit.

eternal_21:  That would work for the name property.  Unfortunately, there are some other properties that are not present in ObjectBase that I have to access. However....
0
 
LVL 5

Author Comment

by:dirtdart
ID: 11911324
Well, the two of you got me close.  I created a new constructor for OrganizationalUnit that acccepts an ObjectBase as an argument.  Then did this:

foreach(ObjectBase o in ou)
{
      OrganizationalUnit u = new OrganizationalUnit(o);

I still can't data bind it, but I can work around that.
0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…
Introduction Although it is an old technology, serial ports are still being used by many hardware manufacturers. If you develop applications in C#, Microsoft .NET framework has SerialPort class to communicate with the serial ports.  I needed to…
Whether it be Exchange Server Crash Issues, Dirty Shutdown Errors or Failed to mount error, Stellar Phoenix Mailbox Exchange Recovery has always got your back. With the help of its easy to understand user interface and 3 simple steps recovery proced…
Is your OST file inaccessible, Need to transfer OST file from one computer to another? Want to convert OST file to PST? If the answer to any of the above question is yes, then look no further. With the help of Stellar OST to PST Converter, you can e…
Suggested Courses
Course of the Month10 days, 22 hours left to enroll

571 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question