ComponentModel documentation [solved] - .NET (Core and Framework) Discussion Boards

Re: WinForms ListView

#realJSOP5-Dec-09 0:38

#realJSOP

5-Dec-09 0:38

This is not a WPF application.

.45 ACP - because shooting twice is just silly
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Re: WinForms ListView

Abhinav S5-Dec-09 3:35

Abhinav S

5-Dec-09 3:35

Will these links help you? Both use INotify.

http://blog.spencen.com/2009/03/04/inotifypropertychanged-via-extension-methods.aspx[^]

http://stackoverflow.com/questions/638859/c-winforms-how-to-update-listbox-items-with-inotifypropertychanged[^]

Re: WinForms ListView

Pete O'Hanlon4-Dec-09 22:31

Pete O'Hanlon

4-Dec-09 22:31

One way to achieve this would be to have your collection implement INotifyCollectionChanged (if using ObservableCollection is out of bounds), and use a mediator class to monitor the changes. Obviously you'd want to use INotifyPropertyChanged for individual items in the collection.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: WinForms ListView

#realJSOP5-Dec-09 0:36

#realJSOP

5-Dec-09 0:36

Would using a DataGridView be a better option? I don't want anything fancy - I just need the listview to update items that have changed (possibly hundreds of items changing every 2 or three seconds or so).

BTW, this isn't a WPF application...

Re: WinForms ListView

Pete O'Hanlon5-Dec-09 8:50

Pete O'Hanlon

5-Dec-09 8:50

I don't know that DGV would be a better choice. The fact that the listview supports virtualisation is a big plus. BTW - I figured it wasn't WPF.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: WinForms ListView

Rama Krishna Vavilala5-Dec-09 1:35

Rama Krishna Vavilala

5-Dec-09 1:35

You can use the VirtualMode in list view.

http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.virtualmode.aspx[^]

This way you can specify your own content in call back events.

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monitoring com port already open

[masterman]4-Dec-09 8:13

[masterman]

4-Dec-09 8:13

Hi,

I want monitor com port already open. I am tring to use win api, with overlapped I/O setting, but don't work.

I suppose need to intercept windows event that contain data excanged from application to com port.

Qualcuno ha un idea su come fare??

Thanks in advance,

Cris

http://bugbusters.altervista.org[^]

ComponentModel documentation [solved]

vtchris-peterson4-Dec-09 5:04

vtchris-peterson

4-Dec-09 5:04

I'm trying to create a Component that sits in the Forms designer component tray and contains additional subcomponents that can be selected and configured via the document outline view (or through a collection property of the main component).

I've looked at numerous code project articles and even peeking at some MS components that behave kind of like this (e.g. ListView), but I can't seem to get my sub-components to show up in the Document Outline.

The MSDN is non-helpful in this area, their "documentation" consists of is a 2 sentence blurb describing an esoteric example and then 10 pages of code that assumes an intimate understanding of the entire .NET component model.

Anyone know of a good source of documentation on this area, or better yet any tips on what I might try?

Thanks,
-Chris

[solved]
I figured out how to do it. In my main component, add a custom designer:

[Designer(typeof(MyDesigner), typeof(IDesigner))]
public class MyComponent : Component

Then in MyDesigner, inherit from System.ComponentModel.Design.ComponentDesigner and override a couple methods, shown below:

public override void Initialize(IComponent component)
{
   base.Initialize(component);

   _myComponent = (MyComponent) component;
}

public override System.Collections.ICollection AssociatedComponents
{
   get
   {
      if (_myComponent == null)
      {
         return base.AssociatedComponents;
      }
      return _myComponent.Subcomponents;
   }
}

Now my sub components are selectable via Document Outline, but suppressed in the component tray (so as to keep it tidy). Cool | :cool:

modified on Friday, December 4, 2009 11:57 AM

DateTime in different cultures

kKamel4-Dec-09 3:01

kKamel

4-Dec-09 3:01

Dear All:
I have a major problem, my web application was supposed to be multinational, so i worked through resource files. But the problem am facing can't be solved by resource file, when i get date Date.Now.DaysOfWeek
the date is in english such as "Monday" how could i directly retrieve the date "Lundi" which is using the french culture.

Re: DateTime in different cultures

dan!sh 4-Dec-09 3:11

dan!sh

4-Dec-09 3:11

Check out the remarks section of this[^] page.

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Re: DateTime in different cultures

Luc Pattyn4-Dec-09 3:15

Luc Pattyn

4-Dec-09 3:15

Oh no, not the documentation again!

Sniff | :^)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: DateTime in different cultures

dan!sh 4-Dec-09 3:20

dan!sh

4-Dec-09 3:20

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Linq and IEnumerable - case insensitive?

shn40023-Dec-09 16:31

shn4002

3-Dec-09 16:31

I have this piece of code that "selects" from an Excel data stream and also from an XML one:
foreach (var ex in dataExcel)
{
ExcelRecs++;
IEnumerable<xelement> part =
from item in Partlists.Descendants("Partx")
where (string)item.Element("Part_name") == ex.Name
select item;

.....
}

How do I make the comparison "case INSENSITIVE"? that is either one of item.Element("Part_name") or ex.Name can be upper case and the other lower case, the == comparise would still be true.

Thanks for your help!

Re: Linq and IEnumerable - case insensitive?

Luc Pattyn3-Dec-09 16:45

Luc Pattyn

3-Dec-09 16:45

you want to compare two strings in a special way?
what class could possibly help you?
and what would be a nice name for a relevant method in such class?

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Linq and IEnumerable - case insensitive?

Mark Salsbery3-Dec-09 19:27

Mark Salsbery

3-Dec-09 19:27

Luc Pattyn wrote:
what class could possibly help you?
and what would be a nice name for a relevant method in such class?

I know! I know!

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Linq and IEnumerable - case insensitive?

Pete O'Hanlon3-Dec-09 23:49

Pete O'Hanlon

3-Dec-09 23:49

Luc Pattyn wrote:
you want to compare two strings in a special way?
what class could possibly help you?

Oooh oooh! Is it CompareTwoStrings.InASpecialWay?

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Linq and IEnumerable - case insensitive?

Luc Pattyn4-Dec-09 1:06

Luc Pattyn

4-Dec-09 1:06

you're giving it away!

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Linq and IEnumerable - case insensitive?

N a v a n e e t h3-Dec-09 16:52

N a v a n e e t h

3-Dec-09 16:52

Use string.Compare.

var part = from item in Partlists.Descendants("Partx")
where string.Compare((string)item.Element("Part_name"), ex.Name, true) == 0
select item;

Best wishes,
Navaneeth

Re: Linq and IEnumerable - case insensitive?

shn40023-Dec-09 17:23

shn4002

3-Dec-09 17:23

Thank you very much Navaneeth! That's what I was looking for!!

Problem with List<>

polomint3-Dec-09 7:40

polomint

3-Dec-09 7:40

Hi,

I have a problem with VS2010beta2 and .NET Framework Client Profile, although I would expect the problem to be something to do with my inexperienced coding.

I have this block of code..

struct sGamePort
{
    public string sgpProtocol;
    public UInt16 sgpPortStart;
    public UInt16 sgpPortEnd;
}

struct sGamePortItem
{
    public string sgpName;
    public List<sGamePort> sgpPortList;
}

List<sGamePortItem> sGames;


private sGamePort ParsePorts(string[] line)
{
    sGamePort gp = new sGamePort();
    gp.sgpProtocol = line[0];
    int num = line.Count();
    if (num == 2)
    {
        // single port opened...
        gp.sgpPortStart =  Convert.ToUInt16(line[1]);
        gp.sgpPortEnd = Convert.ToUInt16(line[1]);
    }
    if (num == 3)
    {
        // port range opened...
        gp.sgpPortStart = Convert.ToUInt16(line[1]);
        gp.sgpPortEnd = Convert.ToUInt16(line[2]);
    }
    return gp;
}

Where line is a string array which essentially holds some tokens.
ie.
line[0] = "NAME"
line[1] = "JOHN"
line[2] = "YOUNG"

Now, in a seperate function I have

sGamePortItem pi = new sGamePortItem();
pi.sgpProtocol = "TCP";
pi.sgpPortList.Add(ParsePorts(strCMD));

This gives me a Null Reference Exception, so I changed it to this...

sGamePortItem pi = new sGamePortItem();
pi.sgpProtocol = "TCP";
sGamePort test = new sGamePort();
test = ParsePorts(strCMD);
pi.sgpPortList.Add(test); // ERROR HERE

Now, the error only occurs on the specified line above.. What am I doing wrong? Is it to do with me using the new keyword incorrectly? Or do I not use 'new'?

Any help would be appreciated as this has been confusing me for a few hours now, lol

Thanks again.

John

Yippee Kai Yai
Signed Polomint.......

Re: Problem with List<>

vtchris-peterson3-Dec-09 7:57

vtchris-peterson

3-Dec-09 7:57

The problem is that your line:

public List<sGamePort> sgpPortList;

should be:

public List<sGamePort> sgpPortList = new List<sGamePort>();

Need to assign a target to sgpPortList before you dereference it, hence the null ref exception.

Re: Problem with List<> [modified]

polomint3-Dec-09 7:59

polomint

3-Dec-09 7:59

Damn, I knew it would be something trivial...

Thanks for waking me up to a silly mistake, Big Grin | :-D

EDIT:
Now I'm getting the error "cannot have instance field initializers in structs"...
Hmmm, this could be a pain...

EDIT AGAIN:
I realised what was wrong.. I hadn't been initialising the sGamePortItem in the list..

sGamePortItem pi = new sGamePortItem();
pi.sgpPortList = new List<sGamePort>();  // THIS WAS NEEDED.

Thank you for your help, it made me think more about the initialisation...

Yippee Kai Yai
Signed Polomint.......

modified on Thursday, December 3, 2009 2:09 PM

Re: Problem with List<>

puri keemti3-Dec-09 22:48

puri keemti

3-Dec-09 22:48

You need to initialize the list of the struct "sGamePortItem" before assigning the object.

Hold the parent session when calling a showModalDialog child

Jose Alvarez de Lara3-Dec-09 4:37

Jose Alvarez de Lara

3-Dec-09 4:37

Hi,

I am developing a web app in VB.NET 1.1. In some Webforms I call a showModalDialog child, but when I close it, the parent session is removed.

Please, how can I hold it?

Thanks in advance,
Jose Alvarez de Lara

Re: Hold the parent session when calling a showModalDialog child

puri keemti3-Dec-09 22:55

puri keemti

3-Dec-09 22:55

Modal dialogues can't refer to their parent using opener. You need to pass a reference to the parent in the second parameter to showModalDialog.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.