Re: DataGrid row tag - C# Discussion Boards

X3mFran1-Jul-05 7:50

1-Jul-05 7:50

I'm programming a C# application and I have one thread making one operation.
This threads is called by a method.
When I use this method from the current Application, by means of a Button it works properly. But if I call this method from another thread the method works only if this thread still alive.
I guess that in the 1st case the threads parent is the application thread but in the second case the parent is the other thread.
I can see it because I generate a Form with this method/thread and it disapears suddenly when I use a thread for call it.

Some help??
D'Oh! | :doh:

PD: Sorry for my English

Re: C# Threading problem

S. Senthil Kumar1-Jul-05 8:34

S. Senthil Kumar

1-Jul-05 8:34

You'd need to state the problem more clearly.

From your description, it looks like you're trying to launch a Form from within the thread. Did you use Form.Show or Form.ShowDialog? I suspect you used Form.Show, that's the reason it worked when invoked from a button. A modeless dialog requires a message pump[^] to be running on the calling thread. When you create one with a button click, it'll use that threads' message pump (which is what processed your message). When you create one in your own thread, you have to run the message pump yourself, like this

Form form = new Form();
Application.Run(form);

in your thread.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: C# Threading problem

X3mFran1-Jul-05 8:58

X3mFran

1-Jul-05 8:58

I'm sorry but this does not works.
I cannot use the method ShowDialog() because I need the Form behaviour and use Aplication.Run(form1) throws a Exception.
...
Maybe I missunderstand your directions, but I think that there will be another solution using some thread properties.

Thanks for your advice.

DataGrid row tag

Jassim Rahma1-Jul-05 7:04

Jassim Rahma

1-Jul-05 7:04

Hi,

Is it possible in datagrid to assign a hidden tag for each row identify the AutoNumber ID from the database instead of displaying it as a column?

Best Regards,
Jassim Rahma

Re: DataGrid row tag

Steve Maier1-Jul-05 7:23

Steve Maier

1-Jul-05 7:23

You can change that cell to be not visible in the DataItemBound method for your datagrid. Something like this....

<br />
private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)<br />
{<br />
	e.Item.Cells[0].Visible = false;<br />
}<br />

Steve Maier, MCSD MCAD

Re: DataGrid row tag

glenn2011-Jul-05 12:46

glenn201

1-Jul-05 12:46

I'm no longer using DataGrid because it was lacking so many features I needed such as setting row/cell keys conveniently. I'm currently using iGrid.NET from www.10tec.com. I'm very happy with it so far. Using this grid, I can easily set the row key like this: iGrid.Rows[row].Key = rowKey;

Glenn

Re: DataGrid row tag

Jassim Rahma1-Jul-05 12:54

Jassim Rahma

1-Jul-05 12:54

Thanks for your reply..

what about data resfresh?

because using datagrid I have to clear the dataset and fill it again which takes time specially on a network.

Best Regards,
Jassim Rahma

Re: DataGrid row tag

glenn2011-Jul-05 17:03

glenn201

1-Jul-05 17:03

Hi Jassim,

Unless I have to refresh the entire grid, I only update individual rows/cells based on what needs to be refreshed - and obviously that's faster than repopulating the dataset and refreshing the grid (iGrid is very fast, by the way). I use grids in unbound mode and I manually populate the grid and maintain/refresh the grid myself. I like working that way better but there might be other ways to populate data in iGrid. I’m not too familiar with that. You may want to send an email to support@10tec.com. They are good at responding emails.

Glenn

how to detect changes to text property of multiple controls bound using CurrencyManger

therealmccoy1-Jul-05 6:13

therealmccoy

1-Jul-05 6:13

I have a GUI with multiple TextBox and ComboBox controls. These controls are bound to a datasource and are update via the CurrencyManager. How can I detect when a user has started to modify the text in one of the controls?

If I advance to the next record I can check the status of the CurrencyManger and determine is the previous row has changed. I want to be able to detect that the row is changing before the user has advanced (or retreated) rows.

Currently I am thinking that I will need to enable the TextChanged event for each control (controls are created dynamically) and use that to determine if an edit has happend and then disable the event when the user advanced to the next row, and then reenable after the controls have populated with data.

Is that a good way?

Thanks.

www.lovethosetrains.com

use debug info from external application

Piovra_1-Jul-05 4:14

Piovra_

1-Jul-05 4:14

I have a class library which prints a report directly from reporting services. I have a few Console.WriteLine statements. When i insert this library in my main application and use it i see the Console.WriteLine info written in the debug window of the .NET IDE. What i would like is to use this info in my own application. Is there a way to print this information somewhere in let's say a textbox of my main application ?

Re: use debug info from external application

Roland Bär1-Jul-05 5:48

Roland Bär

1-Jul-05 5:48

If you use System.Diagnostics.Trace.WriteLine (you can't use formating [with '{0}'] directly with this) instead of System.Console.WriteLine , you can tell your App to get the Trace Data with

System.Diagnostics.TextWriterTraceListener traceListener = new System.Diagnostics.TextWriterTraceListener( {a stream to receive the Trace Messages} );

I don't know if you can also redirect the System.Console.Out Stream.

Greets
Roland

Wenn der Computer wirklich alles kann, dann kann er mich mal kreuzweise.

(Manfred Schmidt)

Follow your Euro notes in their tracks

Re: use debug info from external application

S. Senthil Kumar1-Jul-05 6:07

S. Senthil Kumar

1-Jul-05 6:07

You can always redirect console output to your own stream, provided you launch the process.
You can write a tiny bootstrapping application that launches your main application after redirecting standard output and also captures console output. Something like

class BootStrapper
{
   StreamReader reader;
   public static void Launch()
   {
      ProcessStartInfo info = new ProcessStartInfo();
      info.RedirectStandardOutput = true;
      // Fill other parameters
      ...
      Process p = Process.Start(info);
      reader = p.StandardOutput;
      new Thread(new ThreadStart(ConsoleReader)).Start();
   }
   private void ConsoleReader()
   {
      string line = null;
      while ((line = Process.GetCurrentProcess().StandardOutput.ReadLine()) != null)
      {
	// Update UI
      }
   }
}

Or you can replace calls to Console.WriteLine with Trace.WriteLine and use the method that the other poster suggested.

Hope this helps.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: use debug info from external application

Piovra_6-Jul-05 2:13

Piovra_

6-Jul-05 2:13

yeah this helped for sure thanks a lot to both of you !

Extending xml comment intellisense

Roland Bär1-Jul-05 3:42

Roland Bär

1-Jul-05 3:42

In Visual Studio 2003, when you add an xml comment (with '///'), the IDE helps you with the intellisense to remember the tag names. As NDoc adds some tags (<exclude /> as an examle), it would be nice to have support for this tags in the intellisense.
Is it possible to extend/adapt the list of tags and its structure (the schema), and how? I've searched in the folder of the ide for a schema file or something like this, but was not successfull.

Thanks
Roland

Wenn der Computer wirklich alles kann, dann kann er mich mal kreuzweise.

(Manfred Schmidt)

Follow your Euro notes in their tracks

how to get wsdl using wse 2.0 in short

Iftikhar Akram1-Jul-05 3:36

Iftikhar Akram

1-Jul-05 3:36

how a tcp server running on given uri like "soap:tcp://localhost:8080/MyReceiver" will return wsdl. In normal web service case which runs on http returns wsdl by simply appending '?wsdl' in url, but I am confused how a tcp server will do the same.

plzzzzzzzzz reply Cry | :((

!!

thanks Smile | :)

in advance

iffi

Re: how to get wsdl using wse 2.0 in short

Member 122691721-Jul-05 19:23

Member 12269172

1-Jul-05 19:23

You an use the url with wsdl query string
as

http://localhost/myservice.......?wsdl

Shahzad Raja

Re: how to get wsdl using wse 2.0 in short

4-Jul-05 3:09

Thanks raja jee..
But i have tried the way u suggested...

http://localhost/myservice.......?wsdl

but its not working cz myservice is running on TCP over SOAP

soap:tcp://localhost/myservice.......?wsdl

I dont think so we can access tcp service using http request..
looking forward

Are there any issues with connecting to the ORACLE 10g database through C# .Net?

suvarna joshi1-Jul-05 3:16

suvarna joshi

1-Jul-05 3:16

Are there any issues with connecting to the ORACLE 10g database through C# .Net? I will be using OracleClient namasapce for the same. Let me know if there are any issues with that too.

The OracleClient namespace is available only when we install Oracle client components in the development environment. Do we need the oracle client components to be installed on the production machine as well when we deploay the application or the corresponding dll are enough?

Thanks in advance. Let me know this as soon as possible, because I have to select the backend for my project. Smile | :)

Urgent Integration of Windows Service setup with my project

ksanju10001-Jul-05 1:50

ksanju1000

1-Jul-05 1:50

Hi
I have made window service installer setup
In this program i am using the follwing code inside OnStart

Process.Start(@"c:\sanjeev\farm.exe");
here i have include the whole hard coded path but i do not want to give there the path . Path should be taken from another set up file which is given below

I have made another installer for my Project ( product) which includes help file ,its self product.

THe second setup of my product works file . but when i install the first one setup windows service installer i need to know the path of second one exe file i.e the path of farm.exe

can anybody tell me how can i retrive the path of my product 's exe bec windows installer should automatically know the path of farm.exe file

can anybody tell me

is there any method to integrate my windows service installer and my product installer

Everything is possible

Event fired on killing an application fromTaskManager

manivannan.p1-Jul-05 1:44

manivannan.p

1-Jul-05 1:44

Hi,
I need to know how to capture the killing of a C# windows application from task manager.Does any event of the application can be trapped to know this.
Please let me know your suggestions
Thanks

Re: Event fired on killing an application fromTaskManager

Dave Kreskowiak1-Jul-05 3:46

Dave Kreskowiak

1-Jul-05 3:46

Task Manager first tries to shut your application down normally. This is no different than someone clicking the close button of your form. If your app doesn't respond, you'll get the "End Task" box. This is where the application isn't shutdown, but is just stopped and removed from memory, uncleanly.

If your application is the one being shut down, the only notification your going to get is the Closing event. If your application is hung, you'll never see the event.

If your trying to get notification of another app being shutdown, you can use the Process class WaitForExit method. I'm not saying that this will be a sure fire method for getting a notification, but it's a start.

But, there is no event that says another application is being terminated from TaskManager.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Event fired on killing an application fromTaskManager

manivannan.p1-Jul-05 22:12

manivannan.p

1-Jul-05 22:12

Hi,

The Form_Closing event is not getting called when I kill the applications'exe from the task manager.Though it is called when the Form is killed or manually closed using the close button.

Could you please help on this.
Thanks

Re: Event fired on killing an application fromTaskManager

Dave Kreskowiak2-Jul-05 16:31

Dave Kreskowiak

2-Jul-05 16:31

My mistake. WM_CLOSE messages are not posted to the windows, but WM_QUIT is.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Rational for Generics? Proposal for change

Nick Hounsome1-Jul-05 0:10

Nick Hounsome

1-Jul-05 0:10

Does anyone know of a detailed rational of the choices and decisions made in implementing generics in C# 2.0?

There are good reasons why Generics are not implemented as C++ templates but in some areas it seems that some aspects of the C++ method could have been implemented and would have been superior.

The difference that most concerns me is that with C++, template methods are (normaly) only instantiated if they are referenced and this allows templates to support extra functionality if the parametric class supports it.

For example: I want to create a general struct Pair<T1,T2>. I must immediately decide whether or not it is IComparable and this depends on whether or not its type parameters are constrained to be IComparable.

I no see reason (other than devising a syntax) why implementation of the interface should not be conditional on a where clause restriction on the parametric types.

The parametric restriction of methods is even simpler in principle since a syntax already exists for generic methods that would just need to be extended to allow reference to the parametric types of the class - If the class parameters did not satisy the where clause then the method would not exist and couldn't be called.

A very simple example of my idea:

// Pair<T> is IComparable if and only if T is.
// new bracketing syntax is required to indicate that the constraint applies
// only to the implementation or not of the interface
class Pair<T> : (IComparable where T: IComparable)
{
    T first;
    T second;

    // This method would only exist if T was IComparable
    // The syntax and meaning is the same as for ordinary template 
    // methods except the class parameter is used.
    public int CompareTo(object other) where T: IComparable
    {
        int r1 = first.CompareTo(other.first);
        return r1 != 0 
            ? r1 
            : second.CompareTo(other.second);
    }

    //....
}

Obviously the compiler would have to verify that the constraints on the interface gaurantee the constraints on the methods needed to implement it.

Re: Rational for Generics? Proposal for change

Judah Gabriel Himango1-Jul-05 5:25

Judah Gabriel Himango

1-Jul-05 5:25

Firstly, how is your example different from the implemented generics in 2.0? I can write the same class as

class Pair<T> : IComparable where T: IComparable
{
    T first;
    T second;

    public int CompareTo(T other)
    {
        ...
    }
}

Maybe I'm failing to see your point.

As far as why .NET generics are different from C++ templates, it's because with C++, all template instantiations are known at compile time! With a .NET assembly, your dll or exe could be loaded by someone else and could try to make invalid instantiations of your generic class after compile time.

Take for instance the following class:

class MyGenericDotNetClass<T>
{
    void FooBar(T foo)
    {
        foo.Yippie(); // How does .NET know that this .Yippie() method even exists?
    }
}

This would work as a C++ template, provided that any code that instanciates this class will provide a generic parameter type that has a .Bar() method. With a C++ template, if you said new MyGenericDotNetClass<sometypewithyippiemethod>(), then this would work because the C++ compiler would verify that the .Yippie() method exists for type SomeTypeWithYippieMethod.

.NET, on the other hand, can't depend solely on compile-time checking. Sure, the compiler could check to see if all your code that instantiates this class does so with a type that has a .Yippie() method. However, .NET code is easily shareable between components; a Visual Basic.NET application my load up your MyGenericDotNetClass and with a generic parameter of SomeTypeWithNoYippieMethod(). Of course, the VB.NET compiler could issue an error message, however, we'd then start getting into long, cryptic error message akin to C++ template compiler erros about bad instantiations because no .Yippie() method exists on the proposed generic type. Obviously, this is a quite simple example, real-world code would get much hairier than this. So the .NET designers decided that if you want functionality out of your generic class, you have to specify it explicitly in the form of a constraint.

Ian Griffiths has a good article on his blog here[^] about this very topic.

IMO, generics in .NET is pretty well done. I like it, it's useful, and saves a lot of development time. I think the only change I'd make is for the value types to have an arithmetic constraint of some sort, allowing generic types to easily add, subtract, multiple, divide, etc. But I hear there are plans for this in .NET version 3.

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