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by: Pablo J Royo |
last post by:
Hello:
i have a function that reads a file as an argument and returns a reference
to an object that contains some information obtained from the file: FData
&ReadFile(string FilePath);
But , for example, when the file doesnt exists, i should not return any
reference to a bad constructed object, so i need something as a NULL
reference object. I suppose i could return a pointer instead, but i have
some code written with references which...
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by: David Sworder |
last post by:
Hi,
I've created a UserControl-derived class called MyUserControl that is
able to persist and subsequently reload its state. It exposes two methods as
follows:
public void Serialize(Stream s);
public void Deserialize(Stream s);
Within the MyUserControl class, there is a field of type MyInnerClass
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by: Boniek |
last post by:
Hi
I define a public property in a new form and I can see this property in
table of Properties in Visual. How I can hide this property to see only in
code ?
Thank's Boniek
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by: Fei Li |
last post by:
Hi,
Is null value for a class instance allowed in C#? for example:
MyClass obj = null;
If Not, how to initiate an instance with value 0? How to detect if an
instance is "newed" ? And how to pass a null value to a class constructor
whch has a object paramer can be 0?
In general, how C# handle a pointer with value 0;
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by: I am Sam |
last post by:
I keep getting the following exception error:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information about
the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set
to an instance of an object.
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by: wrytat |
last post by:
How do I check if an object is null in vb? I tried using IsDBNull but it
doesn't work at all. It gives me this error when I try statement like If Not
IsDBNull(theStock.WIPQty) Then:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information about
the error and where it originated in the code.
...
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by: Ganesh Palaniappan |
last post by:
We're getting following exception for the below piece of code. We're wondering how it is possible since we're having a null check for objGraphics and strokePen...
Exception: System.NullReferenceException: Object reference not set to an instance of an object
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by: MikeT |
last post by:
This may sound very elementary, but can you trap when your object is
set to null within the object?
I have created a class that registers an event from an object passed
in the constructor. When my object is destroyed, I want my object to
un-register this event. If I don't then the object would never be
destroyed until the object I passed in the constructor is destroyed.
I have implemented a Dispose(), Dispose(bool), and ~Finalize...
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by: valentin tihomirov |
last post by:
As explained in "Using pointers vs. references"
http://groups.google.ee/group/borland.public.delphi.objectpascal/browse_thread/thread/683c30f161fc1e9c/ab294c7b02e8faca#ab294c7b02e8faca ,
the pointers are allowed to be null, while references must refer an existing
variable of required type. The null is normally used for making optional
parameters. But there is no way to pass null reference in C#. Something is
missing.
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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,...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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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,...
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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...
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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...
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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...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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