.NET (Core and Framework)

Santiago Perez27-Jun-07 5:05

27-Jun-07 5:05

Here's my thing that I don't understand about what you presented earlier, you say to use the Initialise method of the Interface on each individual Derrived class to initilise that instance. My problem with this sample is that you're using an array of type object[] which in itself will do implicit cast on each item thus degrading performance. Secondly you're example of

//Or even call an initialise method on the object itself.
item.Initialise(source.P1, source.P2, "P3");
}

tells me that you will need to write an Initialisation override on each generation of the object, in this case to be able to handle "P3". I guess if it's a virtual you could call base.Initialise and pass it the same params. WOuld that be way to go?

Santiago Perez27-Jun-07 5:29

27-Jun-07 5:29

I got it, I got it, I got it.........Again! I found an elegant solution I think. A light bulb is starting shine!!!! Tell what you think about this solution. THis will allow me to use a static function. WOuld it be better to use an instance virtual function and have each derrived instance call the base.function instead?:

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
B objB = new B();
List<iclass> oBList = new List<iclass>();
List oList = A.GetList();
}
}

public interface iClass
{
string Full_Name
{
get;
set;
}
string Short_Name
{
get;
set;
}
}

public class A : iClass
{
public A()
{
}
private string _PhoneA = "";
private string _Full_Name = "";
private string _Short_Name = "";
public string PhoneA
{
get { return _PhoneA; }
set { _PhoneA = value; }
}

public static List<t> GetList<t>() where T : iClass, new()
{
T obj = new T();
List<t> result = new List<t>();
obj.Full_Name = "Susan";
obj.Short_Name = "Su";

if (typeof(T) == typeof(A))
{

(obj as A).PhoneA = "444-4444";
result.Add(obj);
}
else if (typeof(T) == typeof(B))
{
(obj as B).SSN = "123-12-1111";
result.Add(obj);
}
return result;

}

public string Full_Name
{
get { return _Full_Name; }
set { _Full_Name = value; }
}
public string Short_Name
{
get { return _Short_Name; }
set { _Short_Name = value; }
}

}

public class B : A, iClass
{
private string _SSN = "";
public string SSN
{
get { return _SSN; }
set { _SSN = value; }
}
}

}

Santiago Perez27-Jun-07 5:45

27-Jun-07 5:45

It works both ways!!! Generics is incredible!! It changes the whole game.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Collections.ObjectModel;

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
B objB = new B();
List<iclass> oBList = new List<iclass>();
List oList = A.GetList ();

List BList = new List();
objB.GetThisList(ref BList);
}

void GetNames()
{
Collection OBC = new Collection();
OBC.Add(new B());
}
}

public interface iClass
{
string Full_Name
{
get;
set;
}
string Short_Name
{
get;
set;
}
}

public class A : iClass
{
public A()
{
}
private string _PhoneA = "";
private string _Full_Name = "";
private string _Short_Name = "";
public string PhoneA
{
get { return _PhoneA; }
set { _PhoneA = value; }
}
public static void DoSomethingtoObject(iClass obj)
{
A objA = (A)obj;
objA.Full_Name = "Tom";
}
public static List<t> GetList<t>() where T : iClass, new()
{
T obj = new T();
List<t> result = new List<t>();
obj.Full_Name = "Susan";
obj.Short_Name = "Su";

if (typeof(T) == typeof(A))
{
(obj as A).PhoneA = "444-4444";
result.Add(obj);
}
else if (typeof(T) == typeof(B))
{
(obj as B).SSN = "123-12-1111";
result.Add(obj);
}
return result;

}

public virtual void GetThisList<t>(ref List<t> List) where T : iClass, new()
{
T objA = new T();
objA.Full_Name = "Mary J";
(objA as A).PhoneA = "123456";
List.Add(objA);
}

public string Full_Name
{
get { return _Full_Name; }
set { _Full_Name = value; }
}
public string Short_Name
{
get { return _Short_Name; }
set { _Short_Name = value; }
}

}

public class B : A, iClass
{
private string _SSN = "";
public string SSN
{
get { return _SSN; }
set { _SSN = value; }
}

public override void GetThisList<t>(ref List<t> List)
{
base.GetThisList<t>(ref List);
(List[0] as B).SSN = "123-11-1111";
}

}

}

Santiago Perez28-Jun-07 7:34

28-Jun-07 7:34

I found the solution I was looking for, thanks for your guidance Andy.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Collections.ObjectModel;
using Wintellect.PowerCollections;
using System.Collections.Specialized;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
B objB = new B();
List<iclass> oBList = new List<iclass>();

List oList = A.GetList (); //Static function that evaluate typeof(T)
List BList = new List();
objB.GetThisList(ref BList); //Uses inheritance to call base.GetTHisList<>
}

public interface iClass
{
string Full_Name
{
get;
set;
}
string Short_Name
{
get;
set;
}
}

public class A : iClass
{
public A()
{
}
private string _PhoneA = "";
private string _Full_Name = "";
private string _Short_Name = "";
public string PhoneA
{
get { return _PhoneA; }
set { _PhoneA = value; }
}
public static void DoSomethingtoObject(iClass obj)
{
A objA = (A)obj;
objA.Full_Name = "Tom";
}
public static List<t> GetList<t>() where T : iClass, new()
{
T obj = new T();
List<t> result = new List<t>();
obj.Full_Name = "Susan";
obj.Short_Name = "Su";

if (typeof(T) == typeof(A))
{
(obj as A).PhoneA = "444-4444";
result.Add(obj);
}
else if (typeof(T) == typeof(B))
{
(obj as B).SSN = "123-12-1111";
result.Add(obj);
}
return result;

}

public virtual void GetThisList<t>(ref List<t> List) where T : iClass, new()
{
T objA = new T();
objA.Full_Name = "Mary J";
(objA as A).PhoneA = "123456";
List.Add(objA);
}

public string Full_Name
{
get { return _Full_Name; }
set { _Full_Name = value; }
}
public string Short_Name
{
get { return _Short_Name; }
set { _Short_Name = value; }
}

}

public class B : A, iClass
{
private string _SSN = "";
public string SSN
{
get { return _SSN; }
set { _SSN = value; }
}

public override void GetThisList<t>(ref List<t> List)
{
base.GetThisList<t>(ref List);
(List[0] as B).SSN = "123-11-1111";
}

}

}

Regards,
Santiago "Saint" Perez
Florida's Turnpike Enterprise Santiago.perez@dot.state.fl.us

Andy L 229-Jun-07 5:33

Andy L 2

29-Jun-07 5:33

I am glad to have helped although you did most of it yourself.

Andy

XML 3 BulkLoad Error

Panchal Hardik25-Jun-07 2:25

Panchal Hardik

25-Jun-07 2:25

I have following error in window service same code is working in window Application

"QueryInterface for interface SQLXMLBULKLOADLib.ISQLXMLBulkLoad failed."
Dim objbl As SQLXMLBulkLoad3
objbl = New SQLXMLBulkLoad3
objbl.ConnectionString = "Provider=SQLOLEDB.1;Data Source=pcDB;Initial Catalog=webdb;User ID=sa;pwd=sa"
objbl.ErrorLogFile = "c:\error.log"
objbl.BulkLoad = True
objbl.KeepIdentity = False
objbl.CheckConstraints = False
objbl.Transaction = False
objbl.Execute("c:\Items.XSD", "C:\Items.xml")

Thanks

Hardik Panchal

Re: XML 3 BulkLoad Error

Dave Kreskowiak25-Jun-07 4:04

25-Jun-07 4:04

Don't cross post in multiple forums. It's considered very rude to "spam" the forums and makes it quite difficult for multiple people to collaborate on an answer.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

installation .net 2005

Sumanth Pereji25-Jun-07 2:19

Sumanth Pereji

25-Jun-07 2:19

hi all,

installation failed when i tried to install .net 2005 on windows 2003 server with sp1

Any one please help me

thanks and regards
sumanth

this is sumanth, completed m.c.a from india.

Dave Kreskowiak25-Jun-07 4:09

25-Jun-07 4:09

Would you care to tell us what the error message is?? Or should we just guess at the 1,000 or so possible causes for failure...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Pete O'Hanlon25-Jun-07 5:13

Pete O'Hanlon

25-Jun-07 5:13

Dave Kreskowiak wrote:
Or should we just guess at the 1,000 or so possible causes for failure...

I suspect that it's a PEBKAC failure.

Please visit http://www.readytogiveup.com/ and do something special today.
Deja View - the feeling that you've seen this post before.

Dave Kreskowiak25-Jun-07 5:56

25-Jun-07 5:56

Pete O`Hanlon wrote:
I suspect that it's a PEBKAC failure.

I had to Google that one! Laugh | :laugh:

I normally call it a short between the keyboard and ground.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Pete O'Hanlon25-Jun-07 8:32

Pete O'Hanlon

25-Jun-07 8:32

Dave Kreskowiak wrote:
I normally call it a short between the keyboard and ground

I like that.

Please visit http://www.readytogiveup.com/ and do something special today.
Deja View - the feeling that you've seen this post before.

Getting a the real object from it's handle

originSH25-Jun-07 23:03

originSH

25-Jun-07 23:03

I normally use EBKAC or an ID10T error, but that one only really works when you say it (ID ten T).

Shyam K Pananghat24-Jun-07 20:24

Shyam K Pananghat

24-Jun-07 20:24

Hi,

I am having the handle to a combo box's dropdown list control which i have grabed by subclassing and overriding the "WNDProc" to receive window message. is there any way by which i can know what is the real object behind this handle.So if it is list control can i assign it to a .Net list control and start using that list control in .Net. i tried control.FromHandle.. Listbox.Fromhandle and and some methods inside the marshal class in .Net

so can you please help me getting the real control behind this handle

Shyam
my blog dotnetscoups.blogspot.com .

swthoughts.blogspot.com .

Re: Getting a the real object from it's handle

Dave Kreskowiak25-Jun-07 4:07

Re: Getting a the real object from it's handle

25-Jun-07 4:07

It doesn't work that way. In most cases, you cannot simply slap a .NET controls over a window's handle and treat that handle like a control. Not every control has an unmanaged control sitting behind it.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Shyam K Pananghat25-Jun-07 23:18

Shyam K Pananghat

25-Jun-07 23:18

First of all Thanks very much for your reply..
and about the scenario.....
Hmmm .. that i know.. in my scenario i am having the handle to the dropdown area (control) of a combobox.
so i want to know whether we can assign/create a list control from this handle. so that i can treat it is a list control and add a control in it or do whatever accoding to the project requirement

Shyam
my blog dotnetscoups.blogspot.com .

swthoughts.blogspot.com .

Default Fonts and Chinese

nde_plume23-Jun-07 15:48

nde_plume

23-Jun-07 15:48

I am having a hard time understanding how default system fonts are obtained in .NET. Specifically, I need to internationalize an app, and I need to be able to specify the font for various controls. What I want is something like the the old GDI call GetStockObject to return GUI font, system font, fixed width font etc. Can someone point me in the right direction?

Executing function on GUI-thread

invictus323-Jun-07 8:48

23-Jun-07 8:48

Hi
I have some processing in a thread and want to fire some events into the GUI-thread. Kind of like BackgroundWorker.ReportProgress except that I will not be using the BackgroundWorker, but my own thread .

Anyone got any idea how to add some execution to the GUI-thread's event queue?

Luc Pattyn23-Jun-07 9:04

23-Jun-07 9:04

Sure, any Control that got created by the GUI thread (thats almost any Control!)
will let you execute stuff on that thread by calling myControl.Invoke
(or BeginInvoke).
Thats how one is supposed to let other threads manipulate said Control in the
first place.

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

invictus323-Jun-07 9:12

23-Jun-07 9:12

But what if I dont have any Control to invoke it on? I am making a small library for my own projects, and I want to seperate the processing from the GUI. The processing does not know what components exists and just fire events (that are suppose to happen on the GUI-thread) without knowing what will happen next.

Luc Pattyn23-Jun-07 9:58

23-Jun-07 9:58

Aha, I see two possible ways to solve that:

1.
the official way: if your library is independent of the GUI, then it should
not be interested in the GUI thread either. If it needs something done by the app
it should use delegates/events to get the app's attention so it can process
the event. If (part of) the app's reaction needs to run on the GUI thread, then
that's the app's responsibility, so it must organize the InvokeRequired/Invoke stuff.

2.
a hack: create a GUI Control in your app, and pass it on to your library
(maybe thru a Property, possibly a static one). Now your library can use
Invoke itself. You should describe this behavior in your library's documentation
though, since now, even when called from a background thread, the library can load
the GUI thread and harm the resposiveness of the app that uses the library.

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

invictus323-Jun-07 10:23

23-Jun-07 10:23

How about the ComponentModel?

I just looked into the Mono sourcecode for BackgroundWorker, and they heavily use the ComponentModel with AsyncOperation.Post and BeginInvoke()

Allthough I am not quite sure how it works, it looks like it could solve my problems.

Luc Pattyn23-Jun-07 10:28

23-Jun-07 10:28

I am not familiar with AsyncOperation class; looks promising tho.

BTW: this article[^] just popped up on the home page; it may interest you.

Smile | :)

Luc Pattyn

[My Articles] [Forum Guidelines]

invictus323-Jun-07 10:50

23-Jun-07 10:50

That was JUST what I was looking for. Cheers!!

Luc Pattyn23-Jun-07 12:40