Wednesday, 24 June 2009
|
| Problem with Ienumerable<T> Trey Nash 13:25:14 |
| | Can someone shed any light on why this code will not compile? The compiler
pitches a CS0305 error. This is very frustrating indeed. The problem seems
to be with the IEnumerable.GetEnumerator() method and may be related to the
controversial decision my the Whidbey folks to derive IEnumerable<T> from
IEnumerable.
Thanks,
-Trey
-------------------------------------
using System;
using System.Collections.Generic;
public class MyContainer<T> : IEnumerable<T>
{
public void Add( T item ) {
impl.Add( item );
}
public void Add<R>( MyContainer<R> otherContainer ) {
foreach( item R in otherContainer ) {
impl.Add( item );
}
}
public IEnumerator<T> GetEnumerator() {
foreach( item T in impl ) {
yield return item;
}
}
IEnumerator IEnumerable.GetEnumerator() {
return GetEnumerator();
}
private List<T> impl;
}
public class EntryPoint
{
static void Main() {
MyContainer<long> lContainer = new MyContainer<long>();
MyContainer<int> iContainer = new MyContainer<int>();
lContainer.Add( 1 );
lContainer.Add( 2 );
iContainer.Add( 3 );
iContainer.Add( 4 );
lContainer.Add( iContainer );
foreach( long l in lContainer ) {
Console.WriteLine( l );
}
}
}
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| |  3 answer | Add comment |
Thursday, 18 June 2009
|
| SqlDateTime.Parse not culture sensitive? Mark Griffiths 10:30:17 |
| | The SqlDateTime.Parse() method does not seem to be honouring the current
culture. I am in the UK and have checked that
System.Globalization.CultureInfo.CurrentCulture is set to "en-GB". I'm sure
everyone knows that in the UK we usually format our dates as dd/MM/yyyy.
From the immediate window:
?DateTime.Parse("1/2/2002").ToString("dd-MMM-yyyy")
"01-Feb-2002"
?SqlDateTime.Parse("1/2/2002").Value.ToString("dd-MMM-yyyy")
"02-Jan-2002"
DateTime.Parse works as expected, but SqlDateTime assumes a US format when
parsing the string.
Can anybody confirm this as a bug? or am I doing something wrong?
Mark
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| | 3 answer | Add comment |
Tuesday, 9 June 2009
|
| Request.Browser Mark Kucera 07:14:30 |
| | Has anyone had any luck w/ using Request.Browser in ASP.NET 2.0?
Specifically the Request.Browser.ScreenPixelsHeight,
Request.Browser.ScreenPixelsWidth don't seem to return correct results.
When I check these values they just report 640x480 which is not my
current resolution (1600x1200). I tried it in FireFox and IE so it
doesn't appear to be a browser issue. Is there anything I can do to
make these properties return correct values? I tried to google for this
info, but surprisingly there isn't much out there...
Thanks for any insight you can provide.
MK
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| | 4 answer | Add comment |
Monday, 11 May 2009
|
| RichTextBox - autoscrolling Vince P 20:40:37 |
| | C#2.0
I'm sure this was asked before but I wasn't able to find anything.
--- How to automatically scroll through the text in a RichTextBox when the lines of text go beyond the lower border of the control (like when adding new lines of text in a "status window" type operation)
I know I can set SelectionStart to the end, or ScrollToCaret but these methods/properties require the RichTextBox have the focus.
In this case, my richtextbox is read-only, so the user would never normally put the focus in there, plus the operation that is putting the new lines of text in there takes many minutes to run, so it's not acceptable to keep the focus in there anyway.
I tried this
richTrace.Text = richTrace.Text + addText + Environment.NewLine;
// richTrace.Focus();
richTrace.SelectionStart = richTrace.TextLength - 1;
When richTrace.Focus() is not commented out, the form steals the focus from whatever other form the user might in at that moment.
When it's commented out, the lines of text get appened into the RichTextBox but the text is not scrolled.
Is there a solution to this?
--------------------
"All left-wing parties in the highly industrialised countries are at bottom a sham" - George Orwell "Rudyard Kipling" (1942)
|
| | 6 answers | Add comment |
Sunday, 3 May 2009
|
| Directory Ops Behaving Asynchronous Brady Kelly 02:50:00 |
| | I have the following code execute:
if (Directory.Exists(exportFolder))
{
Directory.Delete(exportFolder, true);
}
Directory.CreateDirectory(exportFolder);
and then a database update, and then:
wiz57.PerformExport();
Occassionally, about 1 in 20 tests I run in the IDE, PerformExport fails
because exportFolder does not exist. How can it not exist if I create it and
no exception is thrown? I can only suspect that the Directory code is not
truly synchronous, and has not completed before PerformExport executes.
Brady Kelly
Software Developer
Chase Software
Office: 011 287 1820
Cell: 078 331 3781
Fax: 086 691 5653
<http://www.chasesoftware.co.za/> www.ChaseSoftware.co.za
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| | 29 answers | Add comment |
Tuesday, 21 April 2009
|
| Getting to know the ListView VirtualMode Richard Kucia 11:34:47 |
| | I need a little assistance to get past a couple of problems with the ListView in VirtualMode. I understand the basics of setting up a VirtualMode ListView.
1) My app has a ComboBox and a ListView. The ComboBox determines what kind of data is shown in the ListView. When the user changes the ComboBox, how can code inform the ListView that all the visible items need to be refetched (because the content is being replaced)?
2) How can code select a virtual item in the ListView?
Thanks.
Richard Kucia
|
| | 7 answers | Add comment |
Thursday, 16 April 2009
|
| convert XDW to PDF Guest 03:54:55 |
| | I'm trying to convert a xdw file to a pdf file with vb.net.
i could convert jpeg or bmp files to a pdf file with iText,
but i can't find a way to convert xdw to pdf.
iText may not support xdw,i think.
Is it possible to make it? |
| | Add comment |
Saturday, 4 April 2009
|
| Random number generation. Vijay M 08:05:26 |
| | Hi all,
I am trying to create a monte carlo code for some computational work in
predicting the path of photons ! I have worked on .NET for the past two
years but havent really pushed the random number generator to know a lot
about it.
A successful monte carlo code depends on a true random number generator
and the efficieny of the generator is prime. I tried searching to
determine any benchmarks as to whether the .NET Random object is truly
random ! But there aren't that many articles in the net about it ( Maybe i
was just blind ?! Feel free to throw some good links if you find )
I could have used Fortran to do it because for ages, people have been
using Fortran to do Monte carlo code and it has been reliable. But i want
to try it in .NET and hoped to settle this matter soon. If anyone has
worked on cryptographic applications or monte carlo codes which depend
solely on random numbers, help me out !
All right. All the ramble apart, the question is whether .NET can be used
to create a successful Monte carlo code ?! If yes, then which class,
System.Random or the System.Security.Cryptography.RandomNumberGenerator,
do i use to get better results ? Also, i am planning to implement the
algorithm as a multithreaded app. The online help specifies that both the
classes are thread safe is declared static but instance variables are
not ! Are there any issues in doing so ? Are there any best practices that
can be followed while using Random numbers in a multithreaded app ??
These are some of the question that have stalled my work for now. Throw in
your advice from experience. Would be glad to hear 'em ! Thanks.
Vijay
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| | 39 answers | Add comment |
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 |
Wednesday, 18 March 2009
|
| Why doesn't DataFormatString="{0:d}" affect the display of datetimes in my GridView BoundColumn? Roy Pardee 15:05:55 |
| | Hey All,
I've got an asp.net 2.0 gridview bound to a mssql view w/a datetime
column in it. Here's the def of the column:
<asp:BoundField DataField="OutDate" HeaderText="Survey Date"
SortExpression="OutDate" DataFormatString="{0:d}" />
The values don't really have time information, so I only want to display
the date portion. From everything I've read, that {0:d} format should
have that effect. But I'm still getting values displayed like:
6/15/2006 12:00:00 AM
I have tried these format specs, none of which are having any effect:
"{0:MM-dd-yyyy}"
"{m/d/yyyy}"
If I make the format string
"{0:d} booga booga!"
Then the values come out as:
6/15/2006 12:00:00 AM booga booga
So I know I'm tweaking the proper column...
Anybody got a clue for me?
Thanks!
-Roy
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| | 5 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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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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Friday, 9 January 2009
|
| Expiration of your subscription to the DOTNET-WINFORMS list PEACH.EASE.LSOFT.COM LISTSERV Server 14:01:13 |
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Wednesday, 7 January 2009
|
| ServiceController status returning wrong state? Blain T Timberlake 19:45:54 |
| | This is a repost from CLR, doesn't seem like there is much activity over
on that list. This isn't really all too advanced though, so I apologize
in advance. ;)
Using the system.ServiceProcess.ServiceController I'm getting some odd
values back.
Basically if I pull up a list of services on a remote machine, there are
several services that consistently report the wrong status back. Some
others however report correctly.
For instance.... I do:
If myService.Status <> ServiceControllerStatus.Running Then
Throw New Exception("Service was not running")
End If
If I run that for the service "Server", which is running, it throws an
exception.
If I run for "Alerter" it reports correctly that it is running.
Checking "Computer Browser" also throws an exception even though it too is
running.
Anyone know of any rhyme or reason for what is going on here? On the
remote machine I am a full administrator. Just using the Services MSC
console I can pull up the list of all the services on the remote machine
and view statuses and/or start and stop them just fine.
Any thoughts?
=Blain
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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 |
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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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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 |
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