.NET (Core and Framework)

Re: User controls in toolbox?

8-Feb-03 9:23

Jörgen Sigvardsson wrote:
VS.NET is even smart enough to not lock the assembly. (The control I'm working on is in the same project, thus it's possible to recompile/link)

It would be easier to click (in project), Add, Inherited UserControl and select the control. Smile | :)

Also gives you more control over the UI.

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James T. Johnson8-Feb-03 12:33

James T. Johnson

8-Feb-03 12:33

Jörgen Sigvardsson wrote:
Is there a way to put my own .NET user controls in the IDE toolbox and then just drag and drop them onto my forms? That would be very nice indeed.

In the next version of VS.NET (2003) it gets easier. Tt has a tab dedicated to user controls in your project so you can just drag/drop from there. The functionality is there in VS.NET 2002 (user controls are at the very bottom of the Windows Forms tab), but it is a bit buggy in that sometimes it doesn't show the controls.

I'm not sure if either version will show user controls that are contained in other projects than the one you are working on.

James

"It is self repeating, of unknown pattern"
Data - Star Trek: The Next Generation

Re: User controls in toolbox?

Jörgen Sigvardsson8-Feb-03 13:00

Jörgen Sigvardsson

8-Feb-03 13:00

James T. Johnson wrote:
In the next version of VS.NET (2003) it gets easier. Tt has a tab dedicated to user controls in your project so you can just drag/drop from there.

Heh, that's how I imagined it should work! I think I've dragged pretty much everything in VS.NET that's detachable into that damn toolbox. Thanks to leppie, I sorted it out though. I did manage at one point to drag the code(!?) of the control into the toolbox. Unsure | :~

James T. Johnson wrote:
I'm not sure if either version will show user controls that are contained in other projects than the one you are working on.

It would be nice if it would work like many Java IDE's: You register a user control as "reusable" and it'll be in the IDE for future use. Preferrably you can label it with a category tag such as "Textboxes", "Listviews", etc. And of course, the IDE should report what assemblies these controls live in so you don't have to search for them all night just before shipment day.. Roll eyes | :rolleyes:

I often find myself reimplementing wheels over and over again. I think this would save me a couple of hours per project. This was possible in VC6 with ActiveX controls, I see no reason why it couldn't be the same in VS.NET with .NET controls.

--
"And God said, Let us make man in our image"

using Process.Container

Kiff5-Feb-03 12:42

Kiff

5-Feb-03 12:42

How to add new Components to Process.Container property?

I get a null object reference error when using Process.Container.Add().

XmlSerializer needs default constructor

moredip5-Feb-03 6:25

moredip

5-Feb-03 6:25

Hi all,

Does anyone have a nifty workaround for the fact that a class that uses XML Serialisation is required to have a default constructor?

I've got a class AuthorInfo, that has a readonly ID variable, that is set in the constructor:

//C# Class...
public class AuthorInfo
{
public readonly m_ID;

public AuthorInfo( uint ID )
{
m_ID = ID;
...
...
}
...
...
}

I'd like this class to be serialised to XML but as noted in MSDN:

"A class must have a default constructor to be serialized by XmlSerializer"

I don't really want to create a default constructor for this class, as I'd like to enforce the fact that it can't be created without an ID being supplied.

Can anyone think of a good way to do this? The only thing I can think of off the top of my head is to create an internal helper class that just deals with Serialisaton. That seems a bit messy to me, and would be awkward to use with Web Services (which is what I'm doing).

Any suggestions/comments appreciated...

TIA,

Pete

Re: XmlSerializer needs default constructor

Giles13-Feb-03 5:50

Giles

13-Feb-03 5:50

You could use a Static Constructor to initialise an internal static countID variable to zero, that just gets incremented and stored in a non-static member as a new ID in the default constructor. Other than that and what relationship the ID has to other data its a little difficult to say.

Quote from a clever bloke :

"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones." - Albert Einstein

Need help regarding marshaling

Thomas Freudenberg5-Feb-03 4:50

5-Feb-03 4:50

Hi all,

in my C# app I have to call a function in a legacy Win32 DLL. This function fills a complex struct. Unfortunately, I don't know how to port the data structure to .NET. Here's a simple example:

public class Test
{
    [StructLayout(LayoutKind.Sequential)]
    public class Test
    {
        int i;
    }
 
    [StructLayout(LayoutKind.Sequential)]
    public class Test2
    {
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=10)]
        public Test1[] tests;
    }
 
    public Test()
    {
        int size = Marshal.SizeOf(typeof(Test2));
    }
}

In the constructor, Marshal.SizeOf throws the exception Type Test2 can not be marshaled as an unmanaged structure; no meaningful size or offset can be computed.

How do I marshal fixed size arrays of struct properly?

Thanks in advance.

Regards
Thomas

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Heath Stewart5-Feb-03 4:57

Heath Stewart

5-Feb-03 4:57

First, those need to be structs. Second, you may need to specify the Test1 struct size, not just the number of elements. If you expect a variable number of elements, you should look at the SizeParam(?) property of the MarshalAsAttribute to specify the index of a member that specifies the number of elements in the struct array.

Reminiscent of my younger years...
10 LOAD "SCISSORS"
20 RUN

Thomas Freudenberg5-Feb-03 5:03

5-Feb-03 5:03

Heath Stewart wrote:
First, those need to be structs.

Ok, but it doesn't help at the moment.

Heath Stewart wrote:
Second, you may need to specify the Test1 struct size, not just the number of elements. If you expect a variable number of elements, you should look at the SizeParam(?) property of the MarshalAsAttribute to specify the index of a member that specifies the number of elements in the struct array.

It's fixed sized, therefore I used SizeConst. Confused | :confused:

Thanks anyway.

Regards
Thomas

leppie5-Feb-03 6:12

5-Feb-03 6:12

I had the same problem and the only way is to Marshal it as a byte[] array and not the encapsulating class. If the class has more members, things become a bit more difficult.

MyDUMeter: a .NET DUMeter clone

Thomas Freudenberg5-Feb-03 6:27

5-Feb-03 6:27

leppie wrote:
If the class has more members, things become a bit more difficult.

In fact, the structurs are cascaded about three levels Dead | X|

Regards
Thomas

leppie5-Feb-03 7:00

5-Feb-03 7:00

I think it is time for a Custom Marshaller. You need to implement this interface.

public interface ICustomMarshaler
{
 public void CleanUpManagedData(object ManagedObj);
 public void CleanUpNativeData(IntPtr pNativeData);
 public int GetNativeDataSize();
 public IntPtr MarshalManagedToNative(object ManagedObj);
 public object MarshalNativeToManaged(IntPtr pNativeData);
}

And set MarshalAs(UnmanagedType.CustomMarshaler) on the class. From there you should havenough control to marshal just about anything. Note: You can now make classes without Layout.

Cheers Smile | :)

MyDUMeter: a .NET DUMeter clone

Thomas Freudenberg5-Feb-03 7:05

Problem with ASPNET Worker Process (aspnet_wp.exe)

5-Feb-03 7:05

leppie wrote:
I think it is time for a Custom Marshaller.

OMG | :OMG:

Ok, it's an opportunity to learn something new Wink | ;)

BTW, I am not the only one with this problem: http://www.dotnet247.com/247reference/msgs/28/141537.aspx[^]

Regards
Thomas

Vasudevan Deepak Kumar4-Feb-03 22:40

Re: Problem with ASPNET Worker Process (aspnet_wp.exe)

4-Feb-03 22:40

Hi,

This is my followup to my previous question. Even after I choose to 'End Process'/'End Process Tree' of aspnet_wp.exe, because it is taking too much of resources, it keeps spawning a new instance, and even after ensuring that no HTTP requests are being sent. I have closed all browsers and all VS.NET windows.

And this instance is taking too much of memory too.

What is the problem?

Deepak Kumar Vasudevan
http://deepak.portland.co.uk/

leppie5-Feb-03 10:19

Re: Problem with ASPNET Worker Process (aspnet_wp.exe)

5-Feb-03 10:19

Deepak Kumar Vasudevan wrote:
Even after I choose to 'End Process'/'End Process Tree' of aspnet_wp.exe, because it is taking too much of resources, it keeps spawning a new instance, and even after ensuring that no HTTP requests are being sent. I have closed all browsers and all VS.NET windows.

This is default behaviour. In case one application crashes another.

Deepak Kumar Vasudevan wrote:
And this instance is taking too much of memory too.

It should not be. ASP.NET is stateless in nature. WHy is it taking so much memory? Can you not unload some memory?

MyDUMeter: a .NET DUMeter clone

Vasudevan Deepak Kumar5-Feb-03 17:46

aspnet_wp.exe process runs continuously and takes too much of resources

5-Feb-03 17:46

Hi,

How can we control in WindowsXP / Windows 2000 Server how much memory each process is taking. If that is the case, can we restrict the amount of memory that is allocated to ASP.NET Worker Process (aspnet_wp.exe)

Deepak Kumar Vasudevan
http://deepak.portland.co.uk/

Vasudevan Deepak Kumar4-Feb-03 21:23

Usage of System EventLogs

4-Feb-03 21:23

Hi all,

I have the following problem, that I am facing. When my ASP.NET page loads and after the page load has completed and even after the browser IE spinner stops spinning, when I check Processes tab in Task Manager, aspnet_wp.exe is still consuming heavy memory and CPU usage is more than 90%. aspnet_wp.exe does not get stopped after page_load is complete.

And very frequently my EventViewer gets so many error messages of the type:

(*) aspnet_wp.exe (PID: 216) was recycled because it was suspected to be in a deadlocked state. It did not send any responses for pending requests in the last 180 seconds.

Why is this happening? I am currently using C#-based ASP.NET application and my backend is IBM DB2 running on RS/6000 AIX server. I am using OLEDB Provider given by IBM DB2 to connect to the database using System.Data.OleDb.

We also frequently get 'Server Application Unavailable' and the following message gets recorded onto the database:

aspnet_wp.exe (PID: 668) stopped unexpectedly.

Please help...

Deepak Kumar Vasudevan
http://deepak.portland.co.uk/

Vasudevan Deepak Kumar4-Feb-03 21:18

Strange PerformanceCounter behaviour

4-Feb-03 21:18

Hi all,

I would like to have the following clarifications. With C#, writing to EventLog and Reading is bit more easier. But could somebody advise me regarding the same.

Any standards that need to be followed, while writing to System EventLogs.
What kind of data can be written into eventlogs?
What is the normal industry custom to adopt when writing to the EventLog also fails? How should the application respond to the user in this circumstance?

Deepak Kumar Vasudevan
http://deepak.portland.co.uk/

solidstore2-Feb-03 23:46

solidstore

2-Feb-03 23:46

I'm working with PerformanceCounter and I'm noticing very strange behaviour.
I can't add any instances to my counters once instances have been removed?
For example our application creates and destroys 'things' at runtime that I
want to add and remove from the perfmon instance list. The first instances
appear but I'm unable to get the new instances (same name & different names)
to appear! Even if I restart my process (Windows Service) I'm unable to even
add the first instances back. I'm forced to reboot the server!

Does anyone have any suggestions? Anything to do with object references?

Performance counters bug?

solidstore2-Feb-03 23:28

solidstore

2-Feb-03 23:28

Why does dotnet add the instances to performance counter all in lower case?
Other counters on the system seem to use mixed case.

Also simple changing the InstanceName and setting its value does not seem to
be enough to create a new instance under perfmon. It appears as though you
must create new PerformanceCounter objects for each instance. Not what the
documentation states though!

Re: Performance counters bug?

leppie8-Feb-03 9:16

Performance counters with instances

8-Feb-03 9:16

solidstore wrote:
Also simple changing the InstanceName and setting its value does not seem to
be enough to create a new instance under perfmon. It appears as though you
must create new PerformanceCounter objects for each instance. Not what the
documentation states though!

Wrong! If you look at the IL, you will see the last 2 instructions:

L_003e: call PerformanceCounter.Close
L_0043: ret

Now look at the NextValue call tree (thanks to Reflector). You will notice that PerfomanceCounter.Initialize() is called everytime, hence being closed, it will re-initialize.

MyDUMeter: a .NET DUMeter clone

solidstore2-Feb-03 23:27

solidstore

2-Feb-03 23:27

I'm working with PerformanceCounter and I'm noticing very strange behaviour.
I can't add any instances to my counters? I used to have a single _Total
instance but now I change my code so that there is meant to be several
instances. I've followed all the examples etc... but no joy. I understand
the instance is meant to be created when you first set the counters value
and that you can reuse the PerformanceCounter object for multiple instances
by just changing the InstanceName before setting the RawValue. Does anyone
have any suggestions? Confused | :confused:

.NET Applets?

Jörgen Sigvardsson1-Feb-03 13:35

Jörgen Sigvardsson

1-Feb-03 13:35

Is it possible to write .NET applets similar to java applets?

--
Ignorant people upsets me.

Re: .NET Applets?

Vasudevan Deepak Kumar1-Feb-03 18:44