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How to assign a value to a real type form control

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Posted on by Johnny

6,478

Hello,

On an extension of Form I have added a Real type control to the form, where I want to assign the number of currently selected lines from grid.

I have created a class and copied the "OnActivated" event of the main datasource. There I have placed the below code:

[FormDataSourceEventHandler(formDataSourceStr(ReqTransPo, ReqPo), FormDataSourceEventType::Activated)]
    public static void ReqPo_OnActivated(FormDataSource sender, FormDataSourceEventArgs e)
    {
        FormRun formRun = sender.formRun() as FormRun;
        
        FormRealControl numOfLinesControl = formRun.design().controlName(formControlStr(ReqTransPo, NumOfLinesXX)) as FormRealControl;
        numOfLinesControl.realValue(sender.recordsMarked().lastIndex());
    }

When I open the form it gives the error message "Object reference not set to an instance of an object."

What do I need to change?

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nmaenpaa 101,160 Moderator on at

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You can assign it by MyControlName.realValue(myRealValue);

So, your problem is not "how to assign a value to a real type form control". Instead you are trying to call a method on a null object.

You must debug your code to find the issue.

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Johnny 6,478 on at

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Yes, it returns null on line 6. Debugging will not really help here, that's why I asked a question here to get an answer how to correctly initialize my FormRealControl.

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Johnny 6,478 on at

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I have re-written the line like:

FormRealControl numOfLinesControl = formRun.control(formRun.controlId(formControlStr(ReqTransPo, NumOfLinesXX))) as FormRealControl;

But it still getting NULL.

The control Auto Declaration property is set to Yes

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nmaenpaa 101,160 Moderator on at

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I think debugging already helped a great deal. Now we know that the issue is in accessing the real control. And not something in line 7, and definetely not in assigning a value to a real control. Perhaps you already knew it but we didn't.

Are you sure that NumOfLinesXX a real control, and not an integer?

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Johnny 6,478 on at

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Not sure what was happening. I did the full build of extension model and it's working now.

But it is working when I select the lines one by one. If I click the "thing" (don't know how it is called) which selects all the lines in the grid the value of my field isn't updated.

Which event should I possible use to get the number of all lines if I click "select all lines" thing on grid?

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nmaenpaa 101,160 Moderator on at

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You should be able to find plenty of examples if you search the web for "dynamics ax (or 365 operations) get number of selected records on grid".

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