I have been using Delphi for a few years, now using Delphi8 and VC#. I
just had a preview on VC# 2.0.
I was wondering why there is no array property? While there is in
VB.net, Delphi.net and IL.
For example, in Delphi, I could have
tStringsObject. strings[i];
tStringsObject. values['something'];
tstringsObject. keys[b];
Array property looks like an array, but does not necessarily need data
buffers.
Array property is really handy for writing/wiring components and
wrapping classes and data.
In C#, you could only have indexer which one for one class. Now when I
port some Delphi code or Delphi 8 codes to C#, I have to change the
interfaces to methods.
I had contacted the Microsoft C# team, and they said they had chose
not to support array property long time ago. "We chose simplicity over
flexibility in this case."
I understand that properties and array properties are essentially
member functions of a class. Published properties could appear on the
object inspector for you to define a collection of items of an array
property at design time.
Without array property, I have to then write codes to initialize items
of a collection. This is not good for RAD.
I heard from a 2-day dot Net seminar, Microsoft is not worried about
its dominant position on desktop applications, Microsoft is much
concerned by Linux on the server markets. Dot Net and C# mostly focus
on server, on which RAD development is not as appeal as on desktop.
I think this is one of the key factors why MS C# team did not want to
implement array property.
Best regards
Dingdang 10 7191
Ding Dang wrote: Array property looks like an array, but does not necessarily need data buffers.
Without array property, I have to then write codes to initialize items of a collection.
No you don't. Define you property as a instance of an internally
defined class. Define an indexer for that.
// Warning : untested code.
class StringsObject
{
private class SO_string
{
public string this[](int i) { ....}
}
public SO_string strings
{
get { .....}
}
}
--
Truth,
James Curran [MVP] www.NJTheater.com (Professional) www.NovelTheory.com (Personal)
James Curran wrote: Ding Dang wrote:
Array property looks like an array, but does not necessarily need data buffers.
Without array property, I have to then write codes to initialize items of a collection.
No you don't. Define you property as a instance of an internally defined class. Define an indexer for that.
// Warning : untested code. class StringsObject { private class SO_string { public string this[](int i) { ....} }
public SO_string strings { get { .....} } }
Hm. that's interesting! Can you put a working piece of code? I just want to understand how exactly
to use it... I am still kinda newbie ;)
Thank you
Andrey
> Dot Net and C# mostly focus on server, on which RAD development is not as appeal as on desktop.
Who said that?
--
William Stacey, MVP
Hi,
Take a look at this Indexer tutorial http://msdn.microsoft.com/library/de...rsTutorial.asp
Regards,
Vikram, S
"Andrey" wrote: James Curran wrote:
Ding Dang wrote:
Array property looks like an array, but does not necessarily need data buffers.
Without array property, I have to then write codes to initialize items of a collection.
No you don't. Define you property as a instance of an internally defined class. Define an indexer for that.
// Warning : untested code. class StringsObject { private class SO_string { public string this[](int i) { ....} }
public SO_string strings { get { .....} } } Hm. that's interesting! Can you put a working piece of code? I just want to understand how exactly to use it... I am still kinda newbie ;)
Thank you Andrey
James,
If the class is internally defined then how would a client know anything
about that internally defined type? The fact that it's exposed as a public
property would do you no good if you don't have a type definition to work
from.
What's wrong with:
class SO_string {
public string this[](int i) {...}
}
class StringsObject {
private SO_string so_string = new SO_string();
public SO_string strings {get {this.so_string ;}}
}
--Bob
"James Curran" <Ja*********@mv ps.org> wrote in message
news:up******** *****@TK2MSFTNG P11.phx.gbl... No you don't. Define you property as a instance of an internally defined class. Define an indexer for that.
// Warning : untested code. class StringsObject { private class SO_string { public string this[](int i) { ....} }
public SO_string strings { get { .....} } }
Bob Grommes wrote: If the class is internally defined then how would a client know anything about that internally defined type? The fact that it's exposed as a public property would do you no good if you don't have a type definition to work from.
You're right (There are reasons why I label such things as "untested
code")
--
Truth,
James Curran [MVP] www.NJTheater.com (Professional) www.NovelTheory.com (Personal)
OK, fully working code:
using System;
namespace PropertyArray
{
class StringsObject
{
public class SO_string
{
public string this[int i]
{
get
{
return i.ToString(); /// put something useful here.
}
}
}
private SO_string my_sos = new SO_string();
public SO_string strings
{
get {return my_sos; }
}
}
//-------------------------------------------------
class Class1
{
[STAThread]
static void Main(string[] args)
{
StringsObject so = new StringsObject() ;
Console.WriteLi ne(so.strings[456]);
}
}
}
--
Truth,
James Curran [MVP] www.NJTheater.com (Professional) www.NovelTheory.com (Personal)
Ding Dang <di******@ihug. com.au> wrote:
<snip> I heard from a 2-day dot Net seminar, Microsoft is not worried about its dominant position on desktop applications, Microsoft is much concerned by Linux on the server markets. Dot Net and C# mostly focus on server, on which RAD development is not as appeal as on desktop.
I think this is one of the key factors why MS C# team did not want to implement array property.
I don't think that's really a factor, to be honest. Properties with
parameters are just as useful in non-RAD development. This is one place
where I think Anders got it wrong, unfortunately. :(
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
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