C# Discussion Boards - CodeProject

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 9:04

hey, I had a cross thread exception...
then i rewrite the problematic part to the next one

private void calculateEuclidianThread()
 {
     CalculateDistance euclidianKNN = new EuclideanDistance_KNN();
     euclidianKNN.stLabel += delegate(object sender, string className)
     {
         string[] s = className.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

         if (dataGridView2.InvokeRequired)
             dataGridView2.Invoke(new MethodInvoker(delegate
                 {
                     dataGridView2.Rows.Add((object[])s);
                 }));
     };
     euclidianKNN.calculateDis(trainingSet, testSet);
 }

but now it stucks when the event rises
what is the problem here ?

thanks

Not Active28-Apr-10 9:12

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 9:12

igalep132 wrote:
now it stucks when the event rises

You'll have to do better than this. Coherently describe the problem and what is happening, including and exceptions.

I know the language. I've read a book. - _Madmatt

igalep13228-Apr-10 9:25

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 9:25

as i wrote before, the exception was

Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

(i've dataGridView control which i tried to fill from thread i created...)
then i rewrite it (as it was posted in the first message)
and now no exception for the cross thread... but when the following line

dataGridView3.Invoke(new MethodInvoker(delegate
                    {
                        dataGridView3.Rows.Add((object[])s);
                    }));

is executed, the whole application freezes.

Not Active28-Apr-10 9:40

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 9:40

igalep132 wrote:
the whole application freezes.

More descriptive then "it stucks"

Why are you even bothering with this? Bind the grid to a datasource and update the datasource, not the grid.

I know the language. I've read a book. - _Madmatt

igalep13228-Apr-10 9:48

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 9:48

i'm not familiar much with whole binding stuff,
i'll be glad to learn but i haven't mentioned that the data is actually some computation result which is calculated during the run time
can i bind this kind of source ?

and, if you can' please explain me what was the problem with the invoker ?

thanks

edit

Not Active28-Apr-10 10:21

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 10:21

igalep132 wrote:
i'll be glad to learn

Then do so and quite possibly you will be able to answer your own question.

I know the language. I've read a book. - _Madmatt

igalep13228-Apr-10 10:26

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 10:26

what exactly i need to look for ?

and again, i would like to know what was wrong with the invoker ?

Not Active28-Apr-10 11:21

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 11:21

igalep132 wrote:
what exactly i need to look for ?

DATABINDING

Does that help?!?

igalep132 wrote:
what was wrong with the invoker ?

It is unnecessary! Learn to use the tools and techniques properly rather than trying to force something to make it work.

I know the language. I've read a book. - _Madmatt

igalep13228-Apr-10 11:46

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

28-Apr-10 11:46

thanks for being so angry...

igalep13230-Apr-10 22:47

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

30-Apr-10 22:47

ok, it still doesn't help !!

i still get the Cross-thread operation not valid: Control... exception when i'm trying to bind the dataGridView with the dataSet

so what should i do now ?

AspDotNetDev28-Apr-10 13:51

28-Apr-10 13:51

What do you mean by "it stucks when the event rises"? You sure it gets stuck and just doesn't add the row? In particular:

dataGridView2.Invoke(new MethodInvoker(delegate
    {
        dataGridView2.Rows.Add((object[])s);
    }));

That code will never be fired if invoke is not required (that is, if dataGridView2.InvokeRequired is set to false). What you need is an "else" condition. See here for more information.

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

igalep13230-Apr-10 21:24

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

30-Apr-10 21:24

but in my case, invoke required, i'm running from different thread...

AspDotNetDev1-May-10 8:51

1-May-10 8:51

Ok, but you didn't answer my question. Answer that and maybe I can assist you.

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

igalep1321-May-10 9:49

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

1-May-10 9:49

i mean that the gui freezes...

AspDotNetDev1-May-10 10:04

1-May-10 10:04

Hmm, can you post a complete example to reproduce your problem? That way, I can debug it on my local computer and maybe give you some insight.

Until then, try this. Replace these:

dataGridView2.InvokeRequired
dataGridView2.Invoke

with these:

this.InvokeRequired
this.Invoke

Not sure that will work, but it's worth a try.

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

igalep1325-May-10 9:41

Re: Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on repair doesnt work

5-May-10 9:41

this.InvokeRequired<br />
this.Invoke

doesn't work (i don't need invoke "this" object)

and about examp

give me your email, and i'll send it to you

AspDotNetDev6-May-10 21:00

6-May-10 21:00

I'm not going to give you my email address and I'm not going to run already compiled code. Create a simple example and paste the code here.

convert String to Decimal

jojoba201128-Apr-10 6:57

jojoba2011

28-Apr-10 6:57

Hi codeproject World !
How can i convert string to decimal and remove unused Zero .
example :
string decimal = "192.0205000";
Decimal D = Decimal.Parse(decimal);

and wanna to have :
D = 192.0205
NOT D= 192.0205000

PLZ HELP !

dan!sh 28-Apr-10 7:01

dan!sh

28-Apr-10 7:01

And what is this code doing? Did even tried this?

jojoba201128-Apr-10 7:06

jojoba2011

28-Apr-10 7:06

Yes
it returns :
D= 192.0205000

BUT I wanna

<code>D= 192.0205  ====> Without unUsed Zeros</code>

Not Active28-Apr-10 7:14

Re: convert String to Decimal [modified]

28-Apr-10 7:14

Either strip the zeros off the string or use Math.Round

I know the language. I've read a book. - _Madmatt

PIEBALDconsult28-Apr-10 10:09

PIEBALDconsult

28-Apr-10 10:09

JYIS, they aren't there! They don't exist!

Edit: I posted that before I saw that you were using Decimal rather than Double.

ToString:

"
The return value is formatted with the general numeric format specifier ("G"), and the NumberFormatInfo object for the current culture.
"

G:

"
The exception to the preceding rule is if the number is a Decimal and the precision specifier is omitted. In that case, fixed-point notation is always used and trailing zeroes are preserved.
"

modified on Wednesday, April 28, 2010 9:38 PM

AspDotNetDev28-Apr-10 13:42

28-Apr-10 13:42

PIEBALDconsult wrote:
JYIS

What does that mean?

PIEBALDconsult wrote:
they aren't there! They don't exist!

The trailing zeroes? Yes they do. See here.