Solved

MyObject obj1 = obj as MyObject;

Posted on 2014-03-03
1
189 Views
Last Modified: 2014-03-11
Can someone tell me what this line of code mean.... MyObject obj1 = obj as MyObject;

class MyObject : IComparable
{
public int ID{ get; set; }
public int CompareTo(object obj)
{
MyObject obj1 = obj as MyObject;
return this.ID.CompareTo(obj1.ID);
}
}

Open in new window

0
Comment
Question by:yguyon28
1 Comment
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 39902123
It's a cast. Ordinarily, you use parentheses and a type name to perform a cast:

e.g.

MyObject obj1 = (MyObject)obj;

Open in new window


This has the consequence that if obj is not actually of type MyObject, or descended from it, then you will encounter an exception. The as operator also performs casts, but it has the added benefit that if the cast will not succeed--that is, if the thing being cast isn't of the type being cast to (or descended from it)--then as will return null. It's a good way to confirm a cast will succeed before working with the casted reference.

A word of warning:  Since as can return null you should be checking for null any time you use as:

e.g.

MyObject obj1 = obj as MyObject;

if (obj1 != null)
{
    // Cast succeeded
}

if (obj1 == null)
{
    // Cast failed
}

Open in new window

0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Keyboard 2 41
Hey!! 5 37
Printing 1 58
Object Oriented Programming, C#, referencing, scoping. 13 69
Extention Methods in C# 3.0 by Ivo Stoykov C# 3.0 offers extension methods. They allow extending existing classes without changing the class's source code or relying on inheritance. These are static methods invoked as instance method. This…
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…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

828 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