473,231 Members | 2,831 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,231 software developers and data experts.

Re: Which generic?

qg**********@mailinator.com wrote:
What about just extending List<T>

class Column Collection : List<Column>
Column this[string someName]
foreach(Column col in this)
if (string.Equals(col.ColumnName, someName,
return col;

return null;
This is a workable solution, however:

- It doesn't implement IDictionary<string, Column>, so it can't be passed to
methods that operate on dictionaries, even though this container logically
is one. Of course, this is a relatively minor issue if you never plan on
doing that anyway.

- It doesn't scale for many columns or for many lookups, since lookup takes
time linear to the number of columns (rather than near-constant time if a
dictionary is used). This may not be an issue if you only ever plan to use
it for a small number of columns, but then you should clearly document that
this is how the class should be used.

- Because it extends List rather than aggregating it, it can't maintain
additional invariants. In particular, it's possible to add a column with the
same name twice. The lookup by name will only ever return one of these
elements. This is unlikely to be what you want.

Jul 2 '08 #1
0 805

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Andreas Huber | last post by:
What follows is a discussion of my experience with .NET generics & the ..NET framework (as implemented in the Visual Studio 2005 Beta 1), which leads to questions as to why certain things are the...
by: mps | last post by:
I want to define a class that has a generic parameter that is itself a generic class. For example, if I have a generic IQueue<Tinterface, and class A wants to make use of a generic class that...
by: Seth Gecko | last post by:
Hi I am working with generic lists of various objects and a control dealing with these lists. For instance: A parent form holds: dim Walls as List(Of wall) dim Segments as List(Of segment) ...
by: rkausch | last post by:
Hello everyone, I'm writing because I'm frustrated with the implementation of C#'s generics, and need a workaround. I come from a Java background, and am currently writing a portion of an...
by: Boris | last post by:
I have a class which should like this ideally: generic <typename T> public ref class ManagedClass { T ^managedMember; UnmanagedClass<U*unmanagedMember; }; I actually would like to specify...
by: Dave | last post by:
I've got these declarations: public delegate void FormDisplayResultsDelegate<Type>(Type displayResultsValue); public FormDisplayResultsDelegate<stringdisplayMsgDelegate; instantiation:...
by: Lloyd Dupont | last post by:
Don't mistake generic type for what you would like them to be!! IFoo<Ahas nothing in common with IFoo<B>! They are completely different type create dynamically at runtime. What you ask is a...
by: ADN | last post by:
Hi, I have a method which calls my service factory: class person { public int ID { get; set: } public string Name {get; set;} } IList<Personmypeople = __serviceFactory.Fetch(new Person())
by: raylopez99 | last post by:
Here is a good example that shows generic delegate types. Read this through and you'll have an excellent understanding of how to use these types. You might say that the combination of the generic...
by: SimonDotException | last post by:
I am trying to use reflection in a property of a base type to inspect the properties of an instance of a type which is derived from that base type, when the properties can themselves be instances of...
by: jianzs | last post by:
Introduction Cloud-native applications are conventionally identified as those designed and nurtured on cloud infrastructure. Such applications, rooted in cloud technologies, skillfully benefit from...
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 7 Feb 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:30 (7.30PM). In this month's session, the creator of the excellent VBE...
by: fareedcanada | last post by:
Hello I am trying to split number on their count. suppose i have 121314151617 (12cnt) then number should be split like 12,13,14,15,16,17 and if 11314151617 (11cnt) then should be split like...
by: stefan129 | last post by:
Hey forum members, I'm exploring options for SSL certificates for multiple domains. Has anyone had experience with multi-domain SSL certificates? Any recommendations on reliable providers or specific...
by: egorbl4 | last post by:
Скачал я git, хотел начать настройку, а там вылезло вот это Что это? Что мне с этим делать? ...
by: MeoLessi9 | last post by:
I have VirtualBox installed on Windows 11 and now I would like to install Kali on a virtual machine. However, on the official website, I see two options: "Installer images" and "Virtual machines"....
by: DolphinDB | last post by:
The formulas of 101 quantitative trading alphas used by WorldQuant were presented in the paper 101 Formulaic Alphas. However, some formulas are complex, leading to challenges in calculation. Take...
by: DolphinDB | last post by:
Tired of spending countless mintues downsampling your data? Look no further! In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
by: Aftab Ahmad | last post by:
So, I have written a code for a cmd called "Send WhatsApp Message" to open and send WhatsApp messaage. The code is given below. Dim IE As Object Set IE =...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.