I have a checkbox as sample, I have to create n-checkbox like that one in a
webform, so I have extended the CheckBox class and wrote a public clone
method that use the protected MemberwiseClone method.
If I look the MemberwiseClone method definiton I find the following phrase:
"
Return Value
A shallow copy of the current Object.
.....
A shallow copy creates a new instance of the same type as the original
object, and then copies the nonstatic fields of the original object. If the
field is a value type, a bit-by-bit copy of the field is performed. If the
field is a reference type, the reference is copied but the referred object
is not; ..
"
It's perfect! Precisely what I need. A bool attribute, like
CheckBox.Checke d, is a value type, so I can set a different checked state
for each checkbox-clone ... but it didn't work. What's wrong?
class Class1
{
[STAThread]
static void Main(string[] args)
{
CheckBox cb=new CheckBox();
cb.Checked=fals e; // !!! That's realy funny, try to comment this line and
run the code again!!!
System.Web.UI.W ebControls.Chec kBox cb1=cb.Clone();
System.Web.UI.W ebControls.Chec kBox cb2=cb.Clone();
Console.WriteLi ne(cb.Checked);
Console.WriteLi ne(cb1.Checked) ;
Console.WriteLi ne(cb2.Checked) ;
cb1.Checked=!cb 1.Checked;
Console.WriteLi ne();
Console.WriteLi ne(cb.Checked);
Console.WriteLi ne(cb1.Checked) ;
Console.WriteLi ne(cb2.Checked) ;
cb2.Checked=!cb .Checked;
Console.WriteLi ne();
Console.WriteLi ne(cb.Checked);
Console.WriteLi ne(cb1.Checked) ;
Console.WriteLi ne(cb2.Checked) ;
Console.ReadLin e();
}
private class CheckBox:System .Web.UI.WebCont rols.CheckBox
{
public CheckBox Clone()
{
return (CheckBox)this. MemberwiseClone ();
}
}
} 0 1570 This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Jason Evans |
last post by:
Hi All,
I am writing my own implementation of queue via a linked list, note
not a LinkedList, and was running into trouble with the clone method.
I was wondering if anyone could point out some not so obvious errors I
have made..
Cheers
|
by: Amil Hanish |
last post by:
I have two classes that I have implemented ICloneable. From my top-level
class, how to I clone the base class values: See "how do I clone the base
class values" below. Since Clone returns an object, what do I assign it to
in my derived class?
public class Base : ICloneable
{
....
public object Clone()
{
|
by: Steve |
last post by:
I can't find a straight answer on what to use? I need a deep copy, so I
implemented IConeable and the Clone() method. However, I'm not sure I did
it correct. Is it suposed to be an allocation of a new object, then the
assignment of each member? Is that all or is there something else I need to
do?
Here is my code
<code>
public Object Clone()
{
|
by: Brian Keating |
last post by:
Hi there,
Consider this from MSDN
*Notes to Inheritors When you derive from DataGridViewCheckBoxCell and add
new properties to the derived class, be sure to override the Clone method to
copy the new properties during cloning operations. You should also call the
base class's Clone method so that the properties of the base class are copied
to the new cell. *
How should I do this?
a)
|
by: Alex D. |
last post by:
hi guys.
I need to clone multiple times an object and I am succesfully cloning using
the regular serialization process, using a MemoryStream. My problem is that
after cloning the object more that 7 or 10 times then my computer's memory
gets flooded and every time I call the Clone() method the processor
resources gets consumed 100% for like 30 seconds. And this problem increases
as the amount of clones are created increases. I read some...
| |
by: Steven |
last post by:
Hi,
I have created my own node (class MyNode : TreeNode) for a TreeView.
To populate the treeview, i use something like MyNode newNode = new
MyNode("Bla bla bla","0","1") for example.
But, to move the nodes in the treeview, i use the clone() method... :
MyNode theCopy = (MyNode)theTreeView.SelectedNode.Clone();
|
by: Hamed |
last post by:
Hello
I am developing a utility to be reused in other programs. It
I have an object of type Control (a TextBox, ComboBox, etc.) that other
programmers use it in applications. they may set some of properties or
assign event handlers. I need to be able to clone the manipulated control at
runtime.
I could use the Clone method of some objects (like Font, Style, String,
|
by: Hamed |
last post by:
Hello
It seems that I should implement ICloneable to implement my own clone
object. the critical point for me is to make a control object based on
another control object that all of its event handlers are set like the old
one. Is there a way to do this job?
For example, is there a way to use EventInfo object to get all event
handlers of the old control in runtime and set my new cloned control events
to the event handlers of the old...
|
by: =?Utf-8?B?Sm9lbCBNZXJr?= |
last post by:
I have created a custom class with both value type members and reference type
members. I then have another custom class which inherits from a generic list
of my first class. This custom listneeds to support cloning:
Public Class RefClass
Public tcp As TcpClient
Public name As String
End Class
Public Class RefClassList
Inherits List(Of RefClass)
Implements ICloneable
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| |
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
| |
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
| |