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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: Andrew McLellan |
last post by:
I think I must be missing something about generics, perhaps just about the
syntax. I'd like to derive a class MyList from System.Collections.Generic so
that it can only contain instance of MyItem.
No problem with
class MyList<T> : List<T>
{
}
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by: Cedric Rogers |
last post by:
I wasn't sure if I could do this. I believe I am stretching the capability of
what generics can do for me but here goes.
I have a generic delegate defined as
public delegate bool RuleDelegate<T>(T item);
In my class my goal is to use a generic list collection to contain my
generic delegates. This will allow me to pass this List to another library
and call this list of functions. This could provide a new way to build rule
base...
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by: Naren |
last post by:
Hi,
why cant a list<derived*be implicitly castable to list<base*>?
Any alternatives other than global operators?
thanks in advance,
Naren.
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by: David Longnecker |
last post by:
I'm working to create a base framework for our organization for web and client-side
applications. The framework interfaces with several of our systems and provides
the business and data layer connectivity for basic operations and such.
I've ran into a snag that I just can't think myself out of.
Here's an example:
I have an object for a Student called StudentRecord. It has properties such
as name, grade, identification number, etc.
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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: alastair g |
last post by:
I have a generic base class and need a list to contain different types
of objects that derive from this.
Public class genericBase<Twhere T: ConfigBase{}
I have tried :
List<genericBase<ConfigBase>_objectTypes
but when I try to add to it using:
ObjectTypes.Add((ObjectType<ObjectConfigBase>)UI);
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by: tshad |
last post by:
I have the following code:
***************************************
public class Test
{
....
public static TestCollection MyNewCollection()
{
}
}
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by: DippyDog |
last post by:
My problem is the subject line. Basically, my thinking was that, given
class TestSpec1 inherits from class TestBase, since I can do this...
Dim tst As TestBase = GetTestObj()
Function GetTestObj() As TestSpec1
Return New TestSpec1
End Function
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by: Scott Stark |
last post by:
Hello,
The code below represents a singly-linked list that accepts any type of
object.
You can see I'm represting the Data variable a System.Object. How would I
update this code to use generics instead of System.Object. I want the code
in Form1_Load to remain exactly the same, but in the background I want to
use generics. I'm trying to get a better understanding of how it works and
I'm a little stuck.
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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...
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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: 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: 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...
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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: 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
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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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