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hi!
I thing I found a bug in TreeView AfterCheck event but
I´m not 100 % sure.
this is my event (C#):
private void displaySaleContractTreeView_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
e.Node.Nodes[1].Checked = true;
e.Node.Nodes[2].Checked = true;
e.Node.Nodes[2].Nodes[0].Checked = true;
e.Node.Nodes[2].Nodes[1].Checked = true;
e.Node.Nodes[2].Nodes[2].Checked = true;
e.Node.Nodes[2].Nodes[3].Checked = true;
e.Node.Nodes[2].Nodes[4].Checked = true;
e.Node.Nodes[2].Nodes[5].Checked = true;
e.Node.Nodes[2].Nodes[6].Checked = true;
e.Node.Nodes[2].Nodes[7].Checked = true;
e.Node.Nodes[3].Checked = true;
MessageBox.Show("TEST");
}
what VS.NEt make:
at first it go to e.Node.Nodes[1].Checked = true;
then VS.NET go not to e.Node.Nodes[2].Checked = true;
VS.NET go again to e.Node.Nodes[1].Checked = true;
after this i become a message:
An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in system.windows.forms.dll
Additional information: Specified argument was out of the range of valid values.
why that doesn´t work?
but it work something like this:
private void displaySaleContractTreeView_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
e.Node.Nodes[1].ForeColor = Color.Red;
e.Node.Nodes[2].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[0].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[1].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[2].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[3].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[4].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[5].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[6].ForeColor = Color.Red;
e.Node.Nodes[2].Nodes[7].ForeColor = Color.Red;
e.Node.Nodes[3].ForeColor = Color.Red;
MessageBox.Show("TEST");
}
is it ahain a bug in VS.NET???
Pawel
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I was working on a sample in Jesse Liberty's "Programming C#" book today and had the same problem. For some reason the code killed the application without an exception. Basically, it looked as though setting the Checked property fires the AfterCheck event. This causes a recursion that kills the program.
This seems to be different that the behavior I am used to (in say VB).
Also, remember that arrays start at zero. Nodes[0], Nodes[1], and Nodex[2] for a node with three child nodes.
You may also want to protect your code to prevent multiple firing of the AfterCheck event.
Boy. How ya gonna keep 'em down on the farm once they seen Karl Hungus.
<p style="text-align: right; margin: 0px;">- The Dude :cool:</p>
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hi!
I have get a replay for me message on an other message board with the solution for this problem. and here is the replay message:
Re: A bug in TreeView AfterCheck event? Posted on: April 12 2002 12:10
Pawel,
By setting e.Node.Nodes[1].Checked = true;
you are firing a new event (because the checked was changed) and displaySaleContractTreeView_AfterCheck will be invoked again even before you come to the second line. I believe you are coming into an infinite loop here.
Anyhow, try to disable the AfterCheck event and enable it again at the end of your handler like this:
private void displaySaleContractTreeView_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
displaySaleContractTreeView.AfterCheck -= new System.Windows.Forms.AfterCheckEventHandler(this.displaySaleContractTreeView_AfterCheck);
e.Node.Nodes[1].Checked = true;
//..
//... do your stuff here
// ..
displaySaleContractTreeView.AfterCheck += new System.Windows.Forms.AfterCheckEventHandler(this.displaySaleContractTreeView_AfterCheck);
}
Hope this works,
Viel Spass,
Minh.
----------------------------------------------------
wow!!
thx!!
for every bug has enderminh a solution!!
IT´s WORK!!!!!!!!!!!!!!!
but some events that you used doesn´t exist.
this is the 100% correct code:
private void displaySaleContractTreeView_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
displaySaleContractTreeView.AfterCheck -= new System.Windows.Forms.TreeViewEventHandler(this.displaySaleContractTreeView_AfterCheck);
e.Node.Nodes[1].Checked = true;
e.Node.Nodes[2].Checked = true;
e.Node.Nodes[2].Nodes[0].Checked = true;
e.Node.Nodes[2].Nodes[1].Checked = true;
e.Node.Nodes[2].Nodes[2].Checked = true;
e.Node.Nodes[2].Nodes[3].Checked = true;
e.Node.Nodes[2].Nodes[4].Checked = true;
e.Node.Nodes[2].Nodes[5].Checked = true;
e.Node.Nodes[2].Nodes[6].Checked = true;
e.Node.Nodes[2].Nodes[7].Checked = true;
e.Node.Nodes[3].Checked = true;
displaySaleContractTreeView.AfterCheck += new System.Windows.Forms.TreeViewEventHandler(this.displaySaleContractTreeView_AfterCheck);
}
thx again!!
DANKE!!
Pawel
-------------------------------------------
Pawel,
No, it's not a bug. It supposed to happen. You have said that "ey, if anyone changes this checkbox, please let me know and run this method". But since you are changing the checkbox inside this own method, it will recursively call this method again. It is supposed to happen. You are still registered to this event. It's like putting the microphone in front of your speaker, I guess. 
Minh.
-----------------------------------------------
Pawel
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I have an ImageList that I created using Icon (*.ico) files. I would like
to extract an image as an Icon, but casting doesn't work:
Icon test = (Icon)imgList.Images[1];
I know I can access the original .ico file from disk or resource, but since
it was already loaded in an ImageList, I thought this would be an easier
method. Does anyone know if this is possible?
Thanks!
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the Bitmap class has a GetHicon() function. and the Icon class has an FromHandle(IntPtr) static function.
so, maybe something like
Icon test = Icon.FromHandle(GetHicon(imgList.Images[1]));
does it?
:wq
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Thanks! Based on your suggestion, here's what worked:
Icon test = Icon.FromHandle(new Bitmap(imgList.Images[1]).GetHicon());
Thanks again!
Derek
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How to make a combobox uneditable?
Thank you for your solution and attention.
Regards
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How do you want it uneditable? So you can't change the text that is picked from the list?
myComboBox.DropDownStyle = ComboBoxStyle.DropDownList; does that
If you want to make it so that you can't even change which value is selected then set the Enabled property to false.
HTH,
James
Simplicity Rules!
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I have a COM object with 2 interfaces, IClient and IClient2.
Using the object with the first interface is easy, I just add it to my project with "Project/Add Reference", and create it like this:
Client tc = new Client();
Then I get access to all the functions in the IClient interface.
But, I also have e newer interface, IClient2, which implements all methods from IClient and some new ones, but I can't figure out how to use IClient2 
Anyone have a good idea?
- Anders
Money talks, but all mine ever says is "Goodbye!"
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In case you don't get any answers here, the DOTNET mailing list has fielded a TON of questions on COM interop; something I haven't had to do which is why I can't answer your question.
Sorry I don't have a straight-up answer,
James
Simplicity Rules!
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Try this :-
C# program :- Clipboard.SetDataObject(new Bitmap("D:\\nish.bmp"),true);
Now try to paste that into Paint Brush or MS Word or Adobe Photoshop or any other non-.NET app.
It will fail!!!
Why?????????????
Nish 
One little CD gone,
Then two CDs gone,
Then 5 more gone,
For a total 7 gones,
If I was a CD R,
I'd wanna cry,
Cause I'd be just a goner,
For a nasty CD burner.
[funny how frustration wakes up the poet in me]
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We've narrowed it down to a problem with Beta 2, poor Nish has to upgrade now and lose VS.NET 
James
Simplicity Rules!
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Yeah, this really sucks!!!
Nish
One little CD gone,
Then two CDs gone,
Then 5 more gone,
For a total 7 gones,
If I was a CD R,
I'd wanna cry,
Cause I'd be just a goner,
For a nasty CD burner.
[funny how frustration wakes up the poet in me]
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How would I go about displaying a HTML document inside a windows form? Is there a control that can display HTML text?
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You have to use the web browser activex control that comes with IE. There is an article here that tells how to use the control in your own .NET programs.
James
Simplicity Rules!
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Alternatively you can use the DHTML ActiveX control (DHTMLED.ocx) to use it, simply find the file (or download the latest copy from Microsoft), then add it to your toolbox and add it to your form as a normal control.
The control as lots of methods that you can use to get HTML in to it, e.g. you can directly load a url:
axDHTMLEdit1.LoadURL("http://www.codeproject.com");
or you can access the DOM to add HTML programatically:
axDHTMLEdit1.DOM.body.innerHTML = "<a href=\"http://www.codeproject.com\">The Code Project</a>";
I suggest you download the DHTMLEd SDK from Microsoft which includes documentation for all the properties and methods.
This is a very powerful control but may be a bit of overkill for what you're doing.
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In Java you have the JAI (Java Advanced Imaging) framework for writing advanced imaging applications. Do you have something similar in C# or is it in the works at Redmond for future release?
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Since I'm not a Java programmer I have no idea what JAI includes, but GDI+ (which .NET incorporates) incorporates transparency, alpha blending, gradients, texture brushes, antialiasing, and more.
James
Simplicity Rules!
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Charles Petzold's book on C# is full of information on this topic.
Nick Parker
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Hi All,
I have a text file which will hold some details for my application.
I am now trying to read these details to display them in my application.
I know how to open a file and setup a StreamReader , but how can I make my reader only read from a certain position or even better search for a certain keyword and then read from there?
Thanks,
Gavin
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If its a text file you should probably use a TextReader instead of a StreamReader. You can use the Seek method of the reader to move or position; but if you are looking for a specific thing you will probably have to read through the file until you find what you are looking for.
James
Simplicity Rules!
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I tried using the TextReader but it didn't have the seek option and I couldn't find anything else which was helpful.
I need to pick up 3 different things from this file, but I can't figure out how to read through the file and select a certain thing?
Or is there a better way to do this other than using a static file.
I just need to store some small strings.
Thanks
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Here's some code:
static void Main(string[] args)
{
const int iReadTotal=10;
const int iReadStart=10;
FileStream f = new FileStream ("C:\\test.vbs",System.IO.FileMode.Open, System.IO.FileAccess.Read);
f.Seek(iReadStart,System.IO.SeekOrigin.Current);
StreamReader st = new StreamReader(f);
char[] buffer=new char[iReadTotal];
st.ReadBlock(buffer,0,buffer.Length);
string s="";
for(int i=0;i<buffer.Length;i++)
s+=buffer[i].ToString();
Console.WriteLine(s);
Console.Read();
}
HTH
Cheers,
Simon
"I get paid for my brain and my thinking in several obscure worlds", Olli, The Lounge
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I want to use database in connected mode with DataReader.After I use ExecuteReader() I waana fill DataGrid with it but I can't add row to DataGrid dynamicly or show the table in DataGrid in Connected mode.
OleDbCommand command = new OleDbCommand ( "select * from Tennis", this.myoleDbConnection );
myoleDbConnection.Open ();
OleDbDataReader reader = command.ExecuteReader ( );
while ( reader.Read () )
{
}
reader.Close ();
myoleDbConnection.Close ();
Mazy
"The path you tread is narrow and the drop is shear and very high,
The ravens all are watching from a vantage point near by,
Apprehension creeping like a choo-train uo your spine,
Will the tightrope reach the end;will the final cuplet rhyme?"Cymbaline-Pink Floyd
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I don't think you can fill the datagrid directly, you have to use a datatable at the very least.
James
Simplicity Rules!
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