Wednesday, 25 March 2009
|
| Re: vb.Net treeview control (New problem) Robert N. Harris 08:08:03 |
| | Thanks Greg, Jacob, Ian, and Walter for all the great advice. I wound up
using a hashtable to store node references and it worked great. I've got
heirarchical information in a datatable. It is essentially a directory
structure, representing the folders in an Outlook mailbox. The treeview is
supposed to display the folder heirarchy just as it would appear in Outlook.
I have two dataviews on the datatable, one just to iterate through all the
records, the second to look for the parent record of subordinate folders.
Here is the basic code (lots of stuff omitted for clarity):
For Each drv In dv 'Iterating through all the folders recorded in the
datatable's default view
If drv("ParentPath") = "" Then 'this will be a root node
'Create the node
nod = New TreeNode
nod.Text = drv("Path")
'Store the node in the hashtable to retrieve it later,
retrieving by the database id
htNodes.Add(drv("ID"), nod)
'Add the node to the root of the tree
tvwFolders.Nodes.Add(nod)
else 'This is a subordinate node
'Find the parent folder in the data table through the second
dataview
intParentIndex = dvParents.Find(drv("ParentPath"))
intParentID = dvParents(intParentIndex)("ID") 'Gets the database ID of the
parent folder
'Retrieve the parent node from the hashtable
nodParent = htNodes.Item(intParentID)
'Create the node
nod = New TreeNode
nod.Text = drv("Path")
'Add the new node to the parent node
nodParent.Nodes.Add(nod)
'Store the child node in the hashtable to retrieve it later in
case it has childern, too
htNodes.Add(drv("ID"), nod)
end if
Next drv
This results in the desired treeview, and in a new problem. Now i am getting
strange exceptions on the line of code that makes the form visible. Here's
the code that instantiates the form with the treeview:
fmReview = New frmReview
fmReview.MdiParent = Me
fmReview.GetBin(strBinNo) 'This is the code that loads the
treeview
Try
fmReview.Show()
Catch
'Stop
End Try
On fmReview.Show(), I get the following exception:
"An unhandled exception of type 'System.OutOfMemoryException' occurred in
system.windows.forms.dll
Additional information: Error creating window handle."
I stop execution in the catch block and check fmReview's properties. It is
visible, and it has a handle. If I just let the code resume and do nothing,
the program executes normally. What is causing this error? It doesn;t seem
to be affecting anything...
Thanks again!
Robert Harris
-----Original Message-----
From: Discussion forum for developers using Windows Forms to build apps
and controls [mailto OTNET-WINFORMS@DISCUSS.DEVELOP.COM]On Behalf Of
Robert N. Harris
Sent: Friday, January 07, 2005 11:32 AM
To: DOTNET-WINFORMS@DISCUSS.DEVELOP.COM
Subject: [DOTNET-WINFORMS] vb.Net treeview control
Hello group! I'm new to this group and only slightly less new to .Net
programming. My background is as a Microsoft Access developer, with
moderate experience in SQL Server and Visual Basic 6. I am currently
rewriting one of our Access applications in VB.Net, and I'm noticing
some subtle differences in the way certain .Net controls behave
compared to their old VB counterparts. I'm hoping someone here can
help me out.
The Treeview control, and specifically the Index property of TreeNode
objects contained in the Treeview. In old VB, the index of a given
node was unique throught the entire treeview control. The index
number of a node was assigned sequentially as you added nodes, and
could not repeat.
In .Net, it appears that the scope of the TreeNode index has changed,
so that it is only unique within the node it was added to. So, there
can be any number of nodes in the Treeview with an index of "0", "1",
or whatever number.
This is causing me trouble because I need to add child nodes at
runtime. I need to know how to uniquely identify a node in the tree,
reference it, and add nodes to it. In old VB the Index or Key
property would accomplish this. Well, the TreeView lost the Key
property in .Net, so I'm stuck.
Any ideas or advice is greatly appreciated.
Thank you!
Robert Harris
|
| |  14 answers | Add comment |
Thursday, 12 February 2009
|
| REGASM Leaves Type Library Brady Kelly 08:28:33 |
| | When I run REGASM /u on an assembly I register, it tells me "Types
un-registered successfully", but using the old OLE/COM Object Viewer, I see
the type library is still registered.
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| | 4 answer | Add comment |
Tuesday, 27 January 2009
|
| ASP.NET Menu control, dynamic menu link to nowhere Ron Young 13:20:22 |
| | I need to display a dynamic menu that has a structure like so:
Programs
- Multi-Family
- Projects
- Residential
- Projects
Where "Multi-Family" is a sub-menu under Programs, and "Projects" is a sub-menu under Multi-Family, and similar for Residential.
I'm using ASP.NET Menu and a sitemap file.
Problem is that I need "Multi-Family" and "Residential" to link to nowhere:
siteMapNode url="Main.aspx" title="Programs"
- siteMapNode url="" title="Multi-Family"
- siteMapNode url="Main.aspx?view=MultiFamilyProjects" title="Projects"
- siteMapNode url="" title="Residential"
- siteMapNode url="Main.aspx?view=ResedentialProjects" title="Projects"
Using an empty string for "url" works for me, but the issue is that the "text" cursor will display if the link doesn't have a url.
I tried some CSS but that didn't work:
.dynamicMenutItem{ cursor: pointer; }
Faking the url with "javascript:;" won't work because the each node needs a unique url.
Any info on this is greatly appreciated.
Ron
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| | 1 answer | Add comment |
Friday, 9 January 2009
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Friday, 12 December 2008
|
i need a project on employee reposi...  ranji 12:04:52 |
| | i need a project on employee repository portal using c# and asp.net
|
| | Add comment |
|
| how to disable image saving in dotn... Guest 11:58:24 |
| | how to disable image saving in dotnet using c# n asp.net |
| | Add comment |
Monday, 1 December 2008
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| Expiration of your subscription to the DOTNET-CLR list L-Soft list server at DevelopMentor 10:26:17 |
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| | 1 answer | Add comment |
Tuesday, 18 November 2008
|
| Trying to trap a "first chance exception" Lee P. Gray 02:08:59 |
| | I keep getting a somewhat random first chance exception when filling a
DataTable:
"A first chance exception of type 'System.IndexOutOfRangeException'
occurred in system.windows.forms.dll"
Sometimes it happens on the first fill, and sometimes it takes several.
I've wrapped the DataAdapter.Fill() statement in try/catch block, and
I've set the IDE to "Break into the debugger" for that exception, but I
can't figure out how to view any more details about the exception to
troubleshoot any further.
When the debugger kicks in, it's on the .Fill() statement, but when I
step through it, the catch block doesn't catch the exception. Does that
mean it's getting caught in the DataAdapter's internals?
Any suggestions?
Thanks,
Lee
|
| | 9 answers | Add comment |
Wednesday, 12 November 2008
|
| Re: Filter what the FolderBrowserDialog shows? Peter Ritchie 06:15:24 |
| | FolderBrowserDialog is a wrapper for SHBrowseForFolder which does support
custom filtering; but FolderBrowserDialog doesn't implement that
particular feature. You'd have to re-write FolderBrowserDialog to do what
you want. Even if it wasn't sealed you'd have to re-write most of code
(RunDialog override and the callback method) anyway.
http://msdn2.microsoft.com/en-us/library/ms647664.aspx describes the
detail of FolderBrowseDialog and the use of the IFilterSite interface to
do the custom filtering. Arik Poznanski wrote a series of articles on
shell programming in C# that included a bit of detail on custom filters in
the first of the series:
http://www.codeproject.com/csharp/csdoesshell1.asp.
HTH
On Mon, 27 Aug 2007 14:11:03 -0600, Bhatnagar, Amit
<Amit.Bhatnagar@GDCANADA.COM> wrote:
Using the FolderBrowserDialog, is there a way to filter what directories that it shows? For example, say I only want the user to pic folders that end in the word "Mail" or something. If the FolderBrowserDialog doesn't support this, would I have to create a custom folder picker and filter the list manually?
|
| | 1 answer | Add comment |
Monday, 10 November 2008
|
| LINUX AND C# Guest 15:57:54 |
| | Does anyone have an idea hot to make c# work on linux if so could u give me detailed explanation coz I don’t know linux but my project is done in c# and linux please mail to me at ammaps_dev@zyberops.com
Thanking u in adavance
|
| | 2 answer | Add comment |
Tuesday, 4 November 2008
|
| Server.Transfer Brandon Manchester 10:36:24 |
| | Can someone please explain why I get a parse error when using
Server.Transfer if I do not include the assembly of the web app that I'm
transferring to in the bin directory of the calling web app?
Both apps are running on the same server so I would think that I would be
able to do a Server.Transfer between the two. Maybe I don't fully grok the
use of Server.Transfer. What I'm trying to do is keep the Session state
alive between two separate web apps and I was under the impression that the
only way to do this is via Server.Transfer. Maybe I'm going about this all
wrong.
Any help would be appreciated.
Thanks,
B.
Brandon D. Manchester
Software Developer
Financial Brokerage
2238 South 156 Circle
Omaha, NE 68130
ph (402)778-4999
http://www.fb-inc.com <http://www.fb-inc.com/>
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| | 18 answers | Add comment |
Thursday, 30 October 2008
|
| Anyone got MiniDumpWriteDump working in managed code? Keith Hill 10:10:48 |
| | I have gotten this far:
[DllImport("DbgHelp.dll")]
private static extern bool MiniDumpWriteDump(IntPtr hProcess,
int processId, IntPtr fileHandle, int dumpType,
IntPtr excepInfo, IntPtr userInfo, IntPtr extInfo);
However, the following WIN32 struct definition for the 5th parameter seems
to be required to make MiniDumpWriteDump useful (using IntPtr.Zero results
in not very useful dumps). Unfortunately I am not sure if it can be
filled in from managed code:
typedef struct _MINIDUMP_EXCEPTION_INFORMATION {
DWORD ThreadId;
PEXCEPTION_POINTERS ExceptionPointers;
BOOL ClientPointers;
} MINIDUMP_EXCEPTION_INFORMATION, *PMINIDUMP_EXCEPTION_INFORMATION;
Specifically, how could I get a pointer to EXCEPTION_POINTERS from managed
code?
--
Keith
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| | 4 answer | Add comment |
Thursday, 23 October 2008
|
| Dynamically invoke web service Alex Ivanoff 12:44:13 |
| | I am trying to invoke a web service for which I do not have generated client proxy at run time using WCF. How do I do this?
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Friday, 17 October 2008
|
| DataGrid Paging Problem in IE Brady Kelly 13:31:31 |
| | I have a single templated column in a DataGrid, in an ASP.NET 2 web site.
The DataGrid is paged, with ten rows per page.
In Firefox, all is good, as nearly always, but when I view the site trough
IE, I get the following exception:
" Invalid postback or callback argument. Event validation is enabled
using in configuration or <%@ Page EnableEventValidation="true" %> in a
page."
Any ideas on what may cause this?
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Wednesday, 8 October 2008
|
| Ajax & WYSIWYG text editor Lior Levi 16:10:51 |
| | Hello,
I have installed WYSIWYG <http://www.openwebware.com/> text editor in an
ASP.NET page. (It worked fine)
Now I am upgrading the web site to work with Ajax that includes a Script
Manager and UpdatePanel.
The page loads correctly but when the Ajax postback occurs the page returns
with just the Textbox and no WYSIWYG text editor control.
Any ideas?
Regards
Lior.
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| | 1 answer | Add comment |
Thursday, 2 October 2008
|
| OT: Test John Warner 18:46:22 |
| | 456
John Warner
|
| | Add comment |
|
| New lists are now active Richard Blewett 11:44:27 |
| | The lists are now migrated. The web address is:
http://peach.ease.lsoft.com/scripts/wa.exe
And the address to post messages is
DOTNET-WINFORMS@PEACH.EASE.LSOFT.COM
<mailtoOTNET-CLR@PEACH.EASE.LSOFT.COM>
Enjoy the new home
Regards
Richard
|
| | 1 answer | Add comment |
Friday, 19 September 2008
|
| PropertyGrid + FileNameEditor + TypeConverter not working. Jamie Seward 09:30:04 |
| | I am having difficulty getting a FileNameEditor working with a Property that get/sets a custom Type (let's call it TextureNameType).
First here is what does work:
1) If I add the FileNameEditor attribute to a Property that get/sets a System::String everything works fine. I can open up the OpenFileDialog and it will change the Property as desired.
2) If I change the Property from a System::String to a TextureNameType (that has a fully operational TextureNameTypeConverter attribute) everything works fine. I can edit the field in the Property Grid and it will convert to and from a System::String properly.
The problem is when I try to give both attributes (FileNameEditor / TextureNameTypeConverter) to TextureNameType at the same time. The OpenFileDialog will open but selecting a file will bring up: "Invalid property value: Object type cannot be converted to target type."
I have set breakpoints in the TextureNameTypeConverter functions and it doesn't hit any of them. So it seems the PropertyGrid doesn't even check my TextureNameTypeConverter to see if it can convert the value returned by the FileNameEditor.
Does anyone know what is causing this? Thanks for any help!
Note: all of the classes are in a Managed C++ Class Library. The PropertyGrid is in a C# project.
Jamie Seward
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Tuesday, 16 September 2008
|
| a problem with auto fit the height of an iframe Lior Levy 01:46:12 |
| |
Hi,
I have a problem with auto fit the height of an iframe.
Can I use a xmlhttprequest and load the responseText into a div?
instead of using iframe?
in that way the div can shrink and grow with the content.
someone have a sample of something like this?
Thanks
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