C# Discussion Boards - CodeProject

Adding a Collection to the Property Browser?

11-Jul-02 23:50

not that hard, all you gotta do is copy the xml they give you into a file of name <project>.exe.manifest and put it in the same directory as the prog and it runs wiv xp style.

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

ADO Null Referance

Steve Severance11-Jul-02 10:40

Steve Severance

11-Jul-02 10:40

I have an SqlCommand AuthUser which call a sproc in a database. When I call execute scalar it produces a NullReferanceException. Code below. Thanks.

private bool CustomAuthenticate(string username,string password)
{
AuthUser.Connection = Global.sqlConnection;
AuthUser.Parameters[0].Value = username;
AuthUser.Parameters[1].Value = password;
long ret = (long)AuthUser.ExecuteScalar();//Crashes here
return (ret > 0);
}

Steve

Not all who wander are lost...

Re: ADO Null Referance

Philip Fitzsimons11-Jul-02 11:59

Philip Fitzsimons

11-Jul-02 11:59

I'm kinda guessing that your stored procedure is returning null.... Roll eyes | :rolleyes:

Re: ADO Null Referance

Steve Severance12-Jul-02 3:19

Steve Severance

12-Jul-02 3:19

ok...Thanks. Is there a way that I can tell?

Steve

Not all who wander are lost...

Re: ADO Null Referance

Nick Parker15-Jul-02 18:15

Nick Parker

15-Jul-02 18:15

Steve Severance wrote:
ok...Thanks. Is there a way that I can tell?

Yes, not sure if you have tried this, but when you load up SQL Server Enterprise Manager you can run stored procedures from within the Query Analyser tool. Keep in mind that your stored procedure may return results, it may even return multiple results, however the ExecuteScalar() method will only extract the first column which could be null in your case. You may wish to consider using the ExecuteReader() method or changing your stored procedure to check for null values.

Nick Parker

Zombies with Coffee, LLC11-Jul-02 9:48

Zombies with Coffee, LLC

11-Jul-02 9:48

What I am needing for my current project is to allow the user to update a collection of objects from a component.

When you add a toolbar to your form, you can then click on the Buttons: (Collection) and the ToolBarButton Collection Editor then appears.

Now I want to do the same thing to my component. I want a RectTrackers: (Collection) property to appear! Smile | :)

I've tried the obvious stuff like

private RectTrackers pRectTrackerCollection = new RectTrackers( );

[Description( "List of all available Rectangle Trackers" )]
public RectTrackers RectTrackerProp
{
   get{ return this.pRectTrackerCollection;  }
   set{ this.pRectTrackerCollection = value; }
}

and it 'seems' to begin to work. The RectTrackers (Collection) property exists, but when I click on it, it is a Object Collection Editor that does not show my internal properties.

Anyone done a custom collection property yet?

Thanks!!

Re: Adding a Collection to the Property Browser?

Zombies with Coffee, LLC11-Jul-02 10:06

Zombies with Coffee, LLC

11-Jul-02 10:06

Well, I found a Microsoft example of them at

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/custcodegen.asp?frame=true

Trying to figure out the code now... Wish me luck.

Anyone like to comment on this, feel free :)

leppie11-Jul-02 9:42

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?

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"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