Hello all,
I have a custom Exception inherited class with the following
constructor. I added the IIf call because the Parameters() value might
be null. But somehow I keep getting an ArgumentNullExc eption on
String.Format: 'Value cannot be null. Parameter name: args'.
If I replace this FalsePart of IIf with a random string like "hello
world", nothing is wrong, the correct part (TruePart) is used and I
get no exception.
It looks like the String.Format is executed anyway, also when the IIf
returns TruePart.
Any clues?
Regards,
Freek Versteijn
Public Sub New(ByVal ExceptionID As Integer, ByVal Parameters() As
Object, ByVal Message As String, ByVal InnerException As Exception)
MyBase.New(IIf( Parameters Is Nothing, Message,
String.Format(M essage, Parameters)) & " (ExceptionID=" & ExceptionID &
")", InnerException)
FExceptionID = ExceptionID
FParameters = New Collection
End Sub 3 1100
Hi,
Make more than one version of the new procedure. Make one version
without the parameters option.
Public Sub New(ByVal ExceptionID As Integer, ByVal Parameters() As
Object, ByVal Message As String, ByVal InnerException As Exception)
MyBase.New(Stri ng.Format(Messa ge, Parameters) & " (ExceptionID="
& ExceptionID & ")", InnerException)
FExceptionId = ExceptionID
FParameters = New Collection
End Sub
Public Sub New(ByVal ExceptionID As Integer, ByVal Message As
String, ByVal InnerException As Exception)
MyBase.New(Mess age & " (ExceptionID=" & ExceptionID & ")",
InnerException)
FExceptionId = ExceptionID
FParameters = New Collection
End Sub
Ken
------------------
"Versteijn" <ve*******@538m ail.nl> wrote in message
news:4d******** *************** ***@posting.goo gle.com: Hello all,
I have a custom Exception inherited class with the following constructor. I added the IIf call because the Parameters() value might be null. But somehow I keep getting an ArgumentNullExc eption on String.Format: 'Value cannot be null. Parameter name: args'. If I replace this FalsePart of IIf with a random string like "hello world", nothing is wrong, the correct part (TruePart) is used and I get no exception. It looks like the String.Format is executed anyway, also when the IIf returns TruePart.
Any clues?
Regards,
Freek Versteijn
Public Sub New(ByVal ExceptionID As Integer, ByVal Parameters() As Object, ByVal Message As String, ByVal InnerException As Exception) MyBase.New(IIf( Parameters Is Nothing, Message, String.Format(M essage, Parameters)) & " (ExceptionID=" & ExceptionID & ")", InnerException) FExceptionID = ExceptionID FParameters = New Collection End Sub
--
Outgoing mail is certified Virus Free.
Checked by AVG Anti-Virus ( http://www.grisoft.com).
Version: 7.0.230 / Virus Database: 263.3.0 - Release Date: 6/12/2004
Versteijn,
As Ken stated overload the constructor & make two versions. It looks like the String.Format is executed anyway, also when the IIf returns TruePart.
Any clues?
The reason for the exception is that IIf is a function! Both the true part &
false part are always evaluated! All three parameters are passed to the IIf
function which then returns one of the two values.
Hope this helps
Jay
"Versteijn" <ve*******@538m ail.nl> wrote in message
news:4d******** *************** ***@posting.goo gle.com... Hello all,
I have a custom Exception inherited class with the following constructor. I added the IIf call because the Parameters() value might be null. But somehow I keep getting an ArgumentNullExc eption on String.Format: 'Value cannot be null. Parameter name: args'. If I replace this FalsePart of IIf with a random string like "hello world", nothing is wrong, the correct part (TruePart) is used and I get no exception. It looks like the String.Format is executed anyway, also when the IIf returns TruePart.
Any clues?
Regards,
Freek Versteijn
Public Sub New(ByVal ExceptionID As Integer, ByVal Parameters() As Object, ByVal Message As String, ByVal InnerException As Exception) MyBase.New(IIf( Parameters Is Nothing, Message, String.Format(M essage, Parameters)) & " (ExceptionID=" & ExceptionID & ")", InnerException) FExceptionID = ExceptionID FParameters = New Collection End Sub
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message news:<Om******* *******@tk2msft ngp13.phx.gbl>. .. Versteijn, As Ken stated overload the constructor & make two versions.
It looks like the String.Format is executed anyway, also when the IIf returns TruePart.
Any clues? The reason for the exception is that IIf is a function! Both the true part & false part are always evaluated! All three parameters are passed to the IIf function which then returns one of the two values.
Hope this helps Jay
DOH! It must have been very very late. Your're right. This is
problably the most stupid problem I have ever had.. Shame:(
Regards,
Freek Versteijn This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Scott Reynolds |
last post by:
I am having a problem exposing a class inherited from the collection base
class as a webservice. If I expose the collection on a web page all works
well and I am very happy.
However when I try and expose this via a web service I get a weird error
saying that the dll could not be found. The specific error is:
I can't figure it out. I thought it was to do with reflection but I am able
to load and view the webservice definition which...
|
by: JSheble |
last post by:
If an exception occurs or is thrown in my constructor, what does the
constructor actually return? A null?
|
by: matko |
last post by:
This is a long one, so I'll summarize:
1. What are your opinions on raising an exception within the
constructor of a (custom) exception?
2. How do -you- validate arguments in your own exception constructors?
I've noticed that, f.ex., ArgumentException accepts null arguments
without raising ArgumentNullException. Obviously, if nothing is to be
supplied to the exception constructor, the default constructor should
|
by: nickyeng |
last post by:
I have written 3 files, i dont know whether i do it correctly or wrongly but somehow it compiled well and can run.
My simple aim is to display the terrain.txt file into the terrain array, and then display terrain into screen.
I can't display the whitespace characters from terrain.txt file to screen.
and
It display "weird"( the red color part).
http://i19.photobucket.com/albums/b171/NickyEng/display.jpg
I tried searching one line by...
|
by: sundarvenkata |
last post by:
Hi All,
I wanted to develop a WPF application to capture the output of a
command line program and display it in a GUI.
However I get a weird error in the following code:
System.Diagnostics.Process pfadminProc = new
System.Diagnostics.Process();
pfadminProc.StartInfo = new
| |
by: Sunil Varma |
last post by:
Hi,
Here is a piece of code where the constructor throws an exception.
class A
{
int n;
public:
A()
try{
|
by: Joel Koltner |
last post by:
I have a generic (do nothing) exception class that's coded like this:
class MyError(exceptions.Exception):
def __init__(self,args=None):
self.args = args
When I attempt to raise this exception via 'raise MyError' I get an exception
within the MyError constructor __init__ as follows:
Traceback (most recent call last):
|
by: Vijay |
last post by:
Hi All,
I am not able to figure out what exactly happening in below code. what
is control flow. Can anyone clear my confusion?
Code:
class A
{
public:
A(){cout<<"In Constructor\n";}
|
by: Lucas Kanebley Tavares |
last post by:
Hello all,
I have a templatized class which has an attribute as: "T *data", all
constructors initialize it to zero, and then allocate memory for the
array (and that IS done correctly, I've checked).
What I find it strange, is that at one point I have to reallocate the
data, but if I put this in my operator= overload:
if (data != 0) delete data; //mem leak here
|
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: 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...
|
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...
|
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: 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: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |