Tuesday, 29 January 2008
|
| COM Callable Library Problem Brady Kelly 13:33:05 |
| | I've just created a COM Callable C# class library, registered with the
Register for COM Interop option, just for testing. Then I'm using some VBA
code to instantiate the object and call it's only method. When I run the
code below, I get an "Object reference not set to an instance of an object."
error, but my object isn't Nothing.
I suspect the interop to be the problem. Has anyone encountered anything
like this before?
Set pdGen = New PdfGenerator.PdfGenerator <My C# class>
ret = pdGen.GeneratePdf(xmlPath, conn)
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| |  1 answer | Add comment |
|
| Question about ComRegisterFunctionAttribute... Gyorgy Bozoki 04:50:43 |
| | Hi all,
I seem to have a problem with ComRegisterFunctionAttribute attribute. Here
is a bit of sample code:
// Start of sample --------------------
// --------------------
// Sample.cs
// --------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace SampleLib
{
public static class Guids
{
public const string CLSID_TestGuid =
"33DE01D3-DC04-4198-AE5D-58B1A36FC122";
}
[Guid ( Guids.CLSID_TestGuid ), ProgId ( "SampleLib.SampleClass" )]
[ClassInterface ( ClassInterfaceType.AutoDual )]
[ComVisible ( true )]
public class SampleClass
{
public void SomeFunc ()
{
MessageBox.Show ( "Something" );
}
}
public static class Helper
{
[ComRegisterFunctionAttribute]
public static void RegServer ( Type oType )
{
MessageBox.Show ( "Register" );
}
[ComUnregisterFunctionAttribute]
public static void UnregServer ( Type oType )
{
MessageBox.Show ( "Unregister" );
}
}
}
// --------------------
// AssemblyInfo.cs
// --------------------
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security.Permissions;
[assembly: AssemblyTitle ( "SampleLib" )]
[assembly: AssemblyDescription ( "" )]
[assembly: AssemblyConfiguration ( "" )]
[assembly: AssemblyCompany ( "" )]
[assembly: AssemblyProduct ( "SampleLib" )]
[assembly: AssemblyCopyright ( "Copyright C 2008" )]
[assembly: AssemblyTrademark ( "" )]
[assembly: AssemblyCulture ( "" )]
[assembly: RegistryPermissionAttribute ( SecurityAction.RequestMinimum,
ViewAndModify = "HKEY_LOCAL_MACHINE" )]
[assembly: ComVisible ( false )]
[assembly: Guid ( "86077dae-29ae-4905-855b-798aaa7be210" )]
[assembly: AssemblyVersion ( "1.0.0.0" )]
[assembly: AssemblyFileVersion ( "1.0.0.0" )]
// End of sample --------------------
The build output is a single DLL, SampleLib.dll.
It seems that the above code builds without any errors but when I try to
register the resulting DLL using regasm.exe, the RegServer and/or
UnregServer function is never called. According to the documentation, these
functions can be public or private (or internal), but they must be static
and take a single Type parameter to be called during registration for COM.
Is there anything I need to do to make this working? I'm using .Net 2.0 with
SP1 and I have this same behavior on several computers. Any advice would be
greatly appreciated.
Thanks,
Gyorgy Bozoki
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| | 5 answers | Add comment |
Monday, 28 January 2008
|
| Funny DataGridView behaviour - Hours and hours Brady Kelly 23:56:20 |
| | From last night I was at work until 03H30 this morning, due to, among other
things, what I find a strange quirk in an unbound DataGridView. When I use
a class derived from DataGridViewRow, and add two or more of these rows to
the grid, without populating their cells (still creating them), all my
custom properties are set to null from the second row onwards. It doesn't
matter whether I populate the cells of the first row or not, it always
survives, but for every subsequent row, if I don't populate at least one
cell, it gets sanitised. Even if the first row has no populated cells,
populating one cell on a subsequent row ensures its survival.
I will illustrate. I have numbered only the lines that are relevant. The
grid does not allow additions, so there are only two rows.
1. In the current state, firstRow.RowName = "Row A", and
lastRow.RowName = "Row B".
2. If I comment out line 4, firstRow.RowName = "Row A", and
lastRow.RowName = {null}.
3. It doesn't seem to matter at all whether lines 1 and 2 are
commented out or not.
public class NamedRow: DataGridViewRow
{
public NamedRow() {}
public NamedRow(string rowName):this()
{
this.RowName = rowName;
}
public string RowName { get; set; }
}
private void GridBadForm_Load(object sender, EventArgs e)
{
dgvLayout.Columns.Add("Column 1", "Column 1");
dgvLayout.Columns.Add("Column 2", "Column 2");
NamedRow namedRowA = new NamedRow("Row A");
namedRowA.CreateCells(dgvLayout);
1 //namedRowA.Cells[0].Value = "A One";
2 //namedRowA.Cells[1].Value = "A Two";
NamedRow namedRowB = new NamedRow("Row B");
namedRowB.CreateCells(dgvLayout);
3 //namedRowB.Cells[0].Value = "B One";
4 namedRowB.Cells[1].Value = "B Two";
dgvLayout.Rows.Clear();
dgvLayout.Rows.Add(namedRowA);
dgvLayout.Rows.Add(namedRowB);
NamedRow firstRow = (NamedRow)dgvLayout.Rows[0];
NamedRow lastRow = (NamedRow)dgvLayout.Rows[1];
Debug.Print(firstRow.RowName);
Debug.Print(lastRow.RowName);
}
|
| | Add comment |
|
| loggin on console app exit chris Burgess 20:46:28 |
| | Is there a way to setup an 'exit' event for a console application so
that I can write to a log before the app terminates?
Thanks!
Chris
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| | 7 answers | Add comment |
|
| Very funny issue with ADODB interop Brady Kelly 16:08:22 |
| | In one method in my Document class, I have the declaration following
declation. It gives me CS0234: The type or namespace name 'RecordSet' does
not exist in the namespace 'ADODB'
ADODB.Recordset sqlRs = new ADODB.Recordset();
However, in another method in the same class, I have the following
declaration that compiles OK. In the same class! My ADODB reference is
working for many such declarations in the project.
ADODB.Recordset qryRs = new ADODB.Recordset();
WTF???
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| | 1 answer | Add comment |
|
| Can I get a SqlConnection from an ADO connection? Brady Kelly 13:52:09 |
| | To solve a problem of participating in a transaction, where COM code calls
into .NET 2.0 code, I need the .NET code to participate in the transaction
started by the COM code. A distributed transaction is not an option, and
sp_bindsession is not working.
I would like, if possible, to receive an ADO connection object in my .NET
class, somehow convert that to an ADO.NET connection object, and be done
with minimal code changes. However, it is not a train smash if I have to
use ADO in my .NET code for the data retrieval. This is my worst case, but
only involves minor changes. I just don't like it.
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| | 2 answer | Add comment |
|
| Negative rowIndex problem for new DataGridViewRow Brady Kelly 01:37:50 |
| | I create and add a new row to an unbound DataGridView. Then, if I try and
access an item in the Cells collection of the row, as in my commented out
code, I get an index out of range exception, rowIndex. I'm not specifying a
row index, so I assume it is inferring it from the row object, whose
rowIndex property is -1. However, when I access the cell through a row in
the grids Rows collection, I'm happy, as in my other code. Can anyone
explain this behaviour?
The exception:
Specified argument was out of the range of valid values.
Parameter name: rowIndex
The code:
ExportLineRow newRow = new ExportLineRow(); // Derived from
DataGridViewRows.
newRow.ExportLine = newLIne;
newRow.CreateCells(dgvLayout);
dgvLayout.Rows.Add(newRow);
int cx = 1;
foreach (Column o in
newRow.ExportLine.RecordLayout.Columns.Values)
{
int rowIndex = dgvLayout.Rows.Count - 1;
dgvLayout.Rows[rowIndex].Cells[cx].Value = o.ColumnValue;
// TODO Find out why this doesn't work. Why is rowIndex -1?
//DataGridViewCell c = newRow.Cells[cx];
//newRow.Cells[cx].Value = o.ColumnValue;
// Exception thrown here.
cx++;
}
My column indexing is clearly not the problem, as in the following
breakdown, the first snippet works with the same column index that's used in
the second snippet, which failes:
Works:
foreach (Column o in
newRow.ExportLine.RecordLayout.Columns.Values)
{
int rowIndex = dgvLayout.Rows.Count - 1;
dgvLayout.Rows[rowIndex].Cells[cx].Value = o.ColumnValue;
cx++;
}
Doesn't work:
foreach (Column o in
newRow.ExportLine.RecordLayout.Columns.Values)
{
DataGridViewCell c = newRow.Cells[cx];
newRow.Cells[cx].Value = o.ColumnValue;
cx++;
}
|
| | 3 answer | Add comment |
Sunday, 27 January 2008
|
| Negative rowIndex for new DataGridViewRow Brady Kelly 16:55:33 |
| | I create and add a new row to an unbound DataGridView. Then, if I try and
access an item in the Cells collection of the row, as in my commented out
code, I get an index out of range exception, rowIndex. I'm not specifying a
row index, so I assume it is inferring it from the row object, whose
rowIndex property is -1. However, when I access the cell through a row in
the grids Rows collection, I'm happy, as in my other code. Can anyone
explain this behaviour?
ExportLineRow newRow = new ExportLineRow(); // Derived from
DataGridViewRow.
newRow.CreateCells(dgvLayout);
dgvLayout.Rows.Add(newRow);
int cx = 0;
foreach (Column o in newLIne.RecordLayout.Columns.Values)
{
int rowIndex = dgvLayout.Rows.Count - 1;
dgvLayout.Rows[rowIndex].Cells[cx].Value = o.ColumnValue;
//DataGridViewCell c = newRow.Cells[cx];
//newRow.Cells[cx].Value = o.ColumnValue;
cx++;
}
|
| | Add comment |
Friday, 25 January 2008
|
| Simulate button click to trigger postback Brady Kelly 13:01:42 |
| | I have tried many ways of forcing a page refresh from within Javascript, but
my learned colleagues of implemented some sort of URL uniqueness scheme to
prevent caching and I think this is messing me around. I have a Refresh
button on the page for a manual refresh, so how do I go about triggering the
server side Click event for that button?
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| | 6 answers | Add comment |
|
| Javascript CallBack Brady Kelly 01:40:13 |
| | I have a list screen that opens a detail screen for editing. I would like
to signal the list screen to refresh itself when the detail screen closes.
What are my options?
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| | 5 answers | Add comment |
|
| Where has my references folder gone Peter Suter 01:40:13 |
| | Hi
In VS2005 references in my web solution have gotten messed up (seem to be a mix of file and project references), and my references folder has disappeared.
Is the missing references folder a symptom of a damaged install, or some sort of feature.
How do I fix the project references?
thanks
ps
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Wednesday, 23 January 2008
|
| Version Incrementation Steve Abaffy 22:53:00 |
| | I have looked all over but cannot find where to set the version number for
builds. I would like for each build of the program to increment the build
number, but after repeatedly rebuilding the application it still shows build
1.0.0. Where do you set this in VS2005?
Thanks
|
| | 3 answer | Add comment |
|
| Optimal Structure for Inserting and Deleting Brady Kelly 21:50:54 |
| | My questions yesterday about linked lists were related to my use of them as
a structure that easily allows insertions and deletions while maintaining
existing order. Is there something better I can use?
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| | 15 answers | Add comment |
|
| User Interface Process Bill Bassler 18:52:33 |
| | More and more I work on web applications (as opposed to websites) that
require rather complex
user process navigation control. To some degree, with careful planning,
some level of navigational control can be achieved through WebForms Page
controller model and the use of controls like the MultiView. However, this
method generally comes at a cost; usually/mostly in ViewState size.
A few years ago, I implemented the MS UIP app block partially to the
purpose of user nav control. The xml navigation maps provided very tight
control over paths
that user could take through the application. I don't want to say
that the UIP didn't have it's issues but it did provide a good level of
user process navigation control plus a lot of the good separation of
concerns due to its MVC aspects.
Over the years I've keep track of the UIP and it kind of has gone away.
Its functionality appears to have been replaced by various implementions:
PageFlow WWF; but this seems like another MS side project; I also see that
asp.net will soon have an MVC option but I've not found any good info on
the out-of-the box controller architecture and if it will support
sequential support user navigational control/routing similar to the UIP.
Question: Is WWF PageFlow a good option for the user process navigation
control in a very high volume business web application? Will MVC support
user process navigation in some form? Are there other
options?
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Tuesday, 22 January 2008
|
| Build configurations Dean Cleaver 23:07:47 |
| | Sorry - possibly not the right place, but I have a problem with a
project not offering a new build configuration. I added a "Live" build
configuration, and all but one application has picked it up - this one
application when I select live in VS (2005) it changes to Debug
instead... it has no Live in its build configuration options.
How do I force that to update?
Dino
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| | 1 answer | Add comment |
|
| Derive concrete type from generic type. Brady Kelly 19:27:09 |
| | Say I wanted a collection of Field objects, but with some extra
functionality, say constraints on how fields can be added. I decided
List<Field> is a good fit for most requirements, but want to derive a
MyFieldList. To the best of my limited generics knowledge, I have to derive
a MyFieldList<T> anyway, but all my refinements in the child class only
refer to type Field, so the generic parameter is basically redundant. Is
there any way around this?
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| | 12 answers | Add comment |
|
| Swap nodes in a linked list Brady Kelly 13:52:35 |
| | Sorry if this is very obvious, but it escapes me now at a time of impending
review. I have a LinkedList<BandLine>, representing a report Band, where
BandLine is one line of text in the band, e.g. one of two detail line types,
or a header line.
I present my linked list using a DataGridView, and am trying to implement
'Move Up' and 'Move Down' commands for band lines, which involves swapping
nodes in my linked list. Now getting the BandLine to move is easy, using
ElementAt and an index provided by the grid, but to complete the swap with
AddBefore, I need a LinkedListNode at a specific index. How can I get this?
My code is as follows, and AddBefore is incomplete without the node I
mention:
private void MoveBandUp()
BandLine lowerBand =
currentBand.ElementAt<BandLine>(dgvBands.SelectedRows[0].Index);
BandLine upperBand =
currentBand.ElementAt<BandLine>(dgvBands.SelectedRows[0].Index - 1);
currentBand.Remove(lowerBand);
currentBand.AddBefore(???, lowerBand)
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| | 8 answers | Add comment |
|
| How to separate an ASP.NET application Claude Petit 00:46:32 |
| | Hi, I want to know how I can divide code for different client setup. The
problem is I have a big application and I need to make packages to respond
to client neeeds. By exemple, a client might just need something (some
functionalities in an ASP.NET page), and it doesn't require something else
(some other functionalities in an ASP.NET page). This way, I could invoice
them for only what they need. I just want a way on how to make that. Tanks.
Claude Petit
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| | 4 answer | Add comment |
Monday, 21 January 2008
|
| Emailing Problem Steve Abaffy 17:02:29 |
| | When I try to send an email from my code in the Development running debug it
works fine, but when I try to send the same email from the production
version I get an error that says Cannot relay for "Email Address". This only
occurs on my machine, the other machines in the shop will all send the email
just fine from the production version of the code? We are using the Sever
2003 SMTP for email.
Any insight would be appreciated.
Thanks
|
| | 2 answer | Add comment |
Sunday, 20 January 2008
|
| Expiration of your subscription to the DOTNET-CX list L-Soft list server at DevelopMentor 14:00:05 |
| | Sun, 20 Jan 2008 06:00:05
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|
| Re: Casting of objects in different namespaces Stephen Patten 05:26:00 |
| | Thanks Shawn!
The Address class is the same across both objects , but just in different namespaces. I was hoping for a simple one liner, but it's looking like I'll have to write a mapper.
Take Care!
Stephen
-----Original Message-----
From: Discussion of building .NET applications targeted for the Web [mailto OTNET-WEB@DISCUSS.DEVELOP.COM] On Behalf Of Shawn Wildermuth
Sent: Saturday, January 19, 2008 3:52 PM
To: DOTNET-WEB@DISCUSS.DEVELOP.COM
Subject: Re: Casting of objects in differnt namespaces
There is unlikely to be an easy conversion unless the two Addresses are exactly the same. You'll likely need to create code to convert one to the other (and probably back). You won't be able to cast them since they are two different types...especially if they are un-related. For example, one Address might call Zipcode "ZIP" and another call it "PostalCode". You'll need to have code that can convert between the two and represent defaults for non-overlapping data (e.g. one has Country and the other one assumes the U.S.).
GL
Thanks,
Shawn Wildermuth
http://adoguy.com
http://wildermuthconsulting.com
Microsoft MVP (C#), MCSD.NET, Author and Speaker
The Silverlight Tour is coming to a city near you!
-----Original Message-----
From: Discussion of building .NET applications targeted for the Web [mailtoOTNET-WEB@DISCUSS.DEVELOP.COM] On Behalf Of Stephen Patten
Sent: Saturday, January 19, 2008 6:36 PM
To: DOTNET-WEB@DISCUSS.DEVELOP.COM
Subject: [DOTNET-WEB] Casting of objects in differnt namespaces
Hello,
Don't know if that was the right title to give this but here goes..
Background: I have pulled down 2 web references into a 2.0 c# project. The
author of the endpoints has created three classes, let's call them Agency,
Advertiser, and Address and exposed Agency in one web reference and
Advertiser in the other. Both an Agency, and Advertiser have an Address, and
this is where the crux of my dilemma.
How do I convert/cast an Agency.Address to an Advertiser.Address, or what
terms should I be trying to research so that I may try to figure this out on
my own?
Thank you for your time,
--
Stephen
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| | 3 answer | Add comment |
|
| Casting of objects in differnt namespaces Stephen Patten 01:37:57 |
| | Hello,
Don't know if that was the right title to give this but here goes..
Background: I have pulled down 2 web references into a 2.0 c# project. The
author of the endpoints has created three classes, let's call them Agency,
Advertiser, and Address and exposed Agency in one web reference and
Advertiser in the other. Both an Agency, and Advertiser have an Address, and
this is where the crux of my dilemma.
How do I convert/cast an Agency.Address to an Advertiser.Address, or what
terms should I be trying to research so that I may try to figure this out on
my own?
Thank you for your time,
--
Stephen
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| | 1 answer | Add comment |
Friday, 18 January 2008
|
| How to invoke one of your own pages Ryan Heath 22:16:43 |
| | Hi,
Does anyone know how to call your own page *within* a page request?
In a server click event I want to render another page (of my own) into
a string for further processing.
I am about to use WebClient and call my own page, but it really
doesn't feel right, there has to be a better way...
// Ryan
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| | 5 answers | Add comment |
|
| Select datagridview row when right clicked Brady Kelly 17:56:48 |
| | I would like to adjust some validations, e.g. Insert doesn't work when the
first row is right clicked, or something like that, but at the moment I
first have to select the first row and the right click it. Is there any way
out of this?
|
| | Add comment |
|
| Delegate.BeginInvoke and EndInvoke. Amit Bhatnagar 00:06:23 |
| | I have made a service to timeout a method call by launching a delegate
asynchronously via BeginInvoke. The documentation states, indirectly,
that the call to BeginInvoke should be followed by a call to EndInvoke
to prevent leaks. However, I am not sure if the call to EndInvoke is
required should the delegate timeout because the call to EndInvoke will
block the thread and wait for the delegate to complete. So I think what
I have is OK, but can anyone confirm if the call to EndInvoke is
required if it timesout?
See the following code:
---
IAsyncResult asyncResult = d.BeginInvoke(null, new object());
if (asyncResult.AsyncWaitHandle.WaitOne(7000, true))
{
// Not timed out...
d.EndInvoke(asyncResult);
}
else
{
//Timed out ... EndInvoke required here?
}
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| | 16 answers | Add comment |
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