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by: matty.hall |
last post by:
I have two classes: a base class (BaseClass) and a class deriving from
it (DerivedClass). I have a List<DerivedClass> that for various
reasons needs to be of that type, and not a List<BaseClass>. However, I
need to cast that list to a List<BaseClass> and it is not working. The
code is below. I get the following exception:
"Unable to cast object of type 'System.Collections.Generic.List`1' to
type 'System.Collections.Generic.List`1'."
...
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by: PJ |
last post by:
I have a class definition :
public class PagingList<T> : List<T>
{
private int pageSize, pageNumber;
public PagingList()
{
pageSize = (this.Count == 0) ? 1 : this.Count;
pageNumber = 1;
}
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by: Jeff.Boeker |
last post by:
I'm learning a lesson in how I need to be more specific :)
In C++ I can resize a vector and it will allocate memory and it will
call the default constructor if necessary (or I can supply an instance
for the copy constructor).
For example:
C++
vector<classvClass;
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by: Iron Moped |
last post by:
I'm airing frustration here, but why does LinkedList<not support the
same sort and search methods as List<>? I want a container that does not
support random access, allows forward and reverse traversal and
natively supports sorting, i.e., STL's list<T>. There isn't even a set of
algorithms that would allow me to easily sort a generic collection.
System.Array has a robust set of static algorithms, why not extend this to
ICollection?
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by: Andrew Robinson |
last post by:
I have a method that needs to return either a Dictionary<k,vor a List<v>
depending on input parameters and options to the method.
1. Is there any way to convert from a dictionary to a list without
itterating through the entire collection and building up a list?
2. is there a common base class, collection or interface that can contain
either/both of these collection types and then how do you convert or cast
from the base to either a...
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by: Zytan |
last post by:
The docs for List say "The List class is the generic equivalent of the
ArrayList class." Since List<is strongly typed, and ArrayList has
no type (is that called weakly typed?), I would assume List<is far
better. So, why do people use ArrayList so often? Am I missing
somehing? What's the difference between them?
Zytan
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by: Zytan |
last post by:
This returns the following error:
"Cannot modify the return value of
'System.Collections.Generic.List<MyStruct>.this' because it is
not a variable"
and I have no idea why! Do lists return copies of their elements?
Why can't I change the element itself?
class Program
{
private struct MyStruct
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by: Fred Mellender |
last post by:
I am trying to use reflection to output the fields (names and values) of an
arbitrary object -- an object dump to a TreeView.
It works pretty well, but I am having trouble with generic lists, like
List<char>.
What I have working is :
Type type = newObj.GetType(); //newObj is what I'm trying to dump
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by: Peter |
last post by:
I have a WebService which returns a List of RunningReport class
How do I read this XML data on the client side. How do I convert
List<RunningReportfrom the WebService side to List<RunningReporton the
client side
I have tried the following:
List<RunningReportreportList = null;
localhost.ReportService localrs = new localhost.ReportService();
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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: 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();...
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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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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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