System.WinForms - C# Discussion Boards

Re: Anyone like to comment on this, feel free :)

11-Jul-02 9:42

What is the easiest way to overcome the following problem?

Controls created on one thread cannot be parented to a control on a different thread.

I have (rather had, struggle to figure it out again Frown | :(

a very complicated way using a public delegate on the parent form and calling it in a very "strange" way when the event was fired.

Thanx all for replying Smile | :)

READ MSDN

Rama Krishna Vavilala11-Jul-02 9:49

Rama Krishna Vavilala

11-Jul-02 9:49

Why do you want to do that? I never ever undertood the need to have two separate GUI threads in an app?

Re: Anyone like to comment on this, feel free :)

leppie11-Jul-02 10:07

11-Jul-02 10:07

thx

An event is fired from a threaded TCP connection. EG in my case, i receive a joined event from the network thread. The executed method for the event is executed on the network thread and not on the GUI thread, hence the error.

READ MSDN

System.WinForms

Nnamdi Onyeyiri11-Jul-02 9:39

11-Jul-02 9:39

Am i right in presuming this exists? i am using SharpDevelop, but when i try and compile my code, it tells me that WinForms does not exist in the System namespace Confused | :confused:

the message also says, are you missing an assembly reference, what assemblies do i need to reference to?

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"All programmers are playwrights and all computers are lousy actors."

Rama Krishna Vavilala11-Jul-02 9:42

Rama Krishna Vavilala

11-Jul-02 9:42

It's System.Windows.Forms Smile | :)

Nnamdi Onyeyiri11-Jul-02 9:44

11-Jul-02 9:44

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Zombies with Coffee, LLC11-Jul-02 9:50

Zombies with Coffee, LLC

11-Jul-02 9:50

Don't feel embarrassed, it was changed from beta to release.

Nnamdi Onyeyiri11-Jul-02 9:56

11-Jul-02 9:56

here's another one,

BorderStyle =FormBorderStyle.FixedDialog;

to set the border style, and it says it is a class where a vairable is expected

[sry for the n00be Q's, but im a n00be to c#]

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

leppie12-Jul-02 0:34

12-Jul-02 0:34

Nnamdi Onyeyiri wrote:
BorderStyle =FormBorderStyle.FixedDialog;

like:

form.FormBorderStyle = FormBorderStyle.FixedDialog; or this.FormBorderStyle = FormBorderStyle.FixedDialog; if you are calling from the form. Note the object reference (form or this)

Are you sure you are not using an old version of SharpDevelop (latest available on sourceforge.net , latest ver 0.88b??? ) or the .NET Framework.

READ MSDN

Nnamdi Onyeyiri12-Jul-02 0:41

Problem with ComboBox.SelectedValue

12-Jul-02 0:41

iam sing the latest version, its just that i was using an add-in for vs6 that turns your dialog resource into c# code [co0l aint it] it does not have support for all controls but that can be added fairly easy [so its stated]. I found this article on CodeGuru [newin].

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Again IIS

Mazdak11-Jul-02 5:18

Mazdak

11-Jul-02 5:18

How can I change setting in IIS programmitically.For example change read/write permission of web applications in IIS.

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

Re: Again IIS

Richard Deeming11-Jul-02 6:03

Richard Deeming

11-Jul-02 6:03

Same thing again: System.DirectoryServices with the IIS provider. MSDN has the documentation under IIS programmers guide.

This sample will dump out the entire structure of the metabase:

using System.DirectoryServices;
...
void testIIS() {
    DirectoryEntry oDE = new DirectoryEntry("IIS://localhost/W3SVC");
    Console.WriteLine("[{1}] {0}", oDE.Path, oDE.SchemaClassName);
    recurseObj(oDE.Children, 1);
    oDE.Dispose();
}

void recurseObj(DirectoryEntries parent, int level) {
    if (parent==null) return;
    foreach (DirectoryEntry oDE in parent) {
        Console.Write(new String(' ', level * 2));
        Console.WriteLine("[{1}] {0}", oDE.Path, oDE.SchemaClassName);
        recurseObj(oDE.Children, level + 1);
        oDE.Dispose();
    }
}

Re: Again IIS

Mazdak11-Jul-02 9:29

Mazdak

11-Jul-02 9:29

Thank you for your help. Smile | :)

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

Listing Local Users

Ben Swann11-Jul-02 4:29

Ben Swann

11-Jul-02 4:29

I am trying to list all the local users, groups, domains etc attached to the
local machine.

I haven't been able to find anything in the .net docs. I am not sure if there
is no support for it due to the .net environment being a standalone run time.
Thus having to call the win32 api directly in order to accomplish this task.

I was reading into the WMI without any joy.

Any thoughts.

Re: Listing Local Users

Richard Deeming11-Jul-02 5:44

Richard Deeming

11-Jul-02 5:44

Use System.DirectoryServices with the WinNT provider. It's pretty much the same as using ADSI.

Re: Listing Local Users

Philip Fitzsimons11-Jul-02 12:00

Philip Fitzsimons

11-Jul-02 12:00

in fact it is the same

leppie11-Jul-02 3:57

11-Jul-02 3:57

Hi all,

ComboBox.SelectedValue dont seem to work correctly. Code:

... 
void SetupCustomers(){ //called from form constructor
cbCust.DataSource = dbase.GetCustomers(); //returns Customer[] from database
cbCust.DisplayMember = "Name"; // The name property
cbCust.ValueMember = "ID"; // The ID property (PK in database)
}
...

However when calling cbCust.SelectedValue returns the wrong value. Calling ((Customer)cbCust.SelectedItem).ID gives the correct answer.

This seems to be a problem with the DisplayMember being (automatically) sorted as all the returned SelectedValue's are within range.

EG : Customers[] expanded may look like this:

ID(Value) Name(Display)
20 Ben
21 John
23 Ann
26 Frank
27 Arnold

The combobox will display the Displaymembers in alphebetical order. Here is where the problem lies (i think Smile | :)

):

Value Display
20 Ann
21 Arnold
23 Ben
26 Frank
27 John

Now this is how Mr. ComboBox display and intepret Value and Display members, thus getting the mappings all wrong.

If anyone has had a similar experience or can spot where I made a mistake, please tell me Smile | :)

Thanking all replies in advance

Cheers Smile | :)

READ MSDN

Chris Rickard11-Jul-02 8:54

Chris Rickard

11-Jul-02 8:54

I don't suppose you're setting the Sort property on the combobox? If not maybe an explicit set to false would do the trick

leppie11-Jul-02 9:29

11-Jul-02 9:29

Thanx Chris, however...

1. no the Sort property is not set.
2. but Sorting is really needed. Smile | :)

Like i said a quick work around does the trick, but i have searched forums and articles with nothing pointing to what i experience.

READ MSDN

Chris Rickard11-Jul-02 10:16

Chris Rickard

11-Jul-02 10:16

I was able to reproduce the behavior doing to following:

I made a class: test with properties Name and Id.
Set the ComboBox's DataSource to a test[] With Name as DisplayMember and Id as ValueMember
Set Sorted=true

Noting that I had to set sort before setting the DataSource property otherwise it will throw an exception.

In thinking about it the behavior makes sense that it could happen this way. When you set the DataSource of a ComboBox it copies the list to its own internal list.

Text returns the item in the internal list. SelectedValue uses a combiniation of CurrenctManager ,SelectedIndex and ValueMember to retrieve an Item from the datasource. SelectedItem is probably a pointer stored in the internal list that gets Sorted with Text.

Anyways Sorting your DataSource (via Array.Sort, ArrayList.Sort, DataTable.DefaultView.Sort; whatever the type of DataSource you have) should fix the problem. Even if the
Sorted property inadvertantly gets set on the combobox, there's no mismatch between your datasource and its internal list because its already sorted. Smile | :)

leppie11-Jul-02 10:46