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Error rewriting a datagrid

  • September 12, 2016
  • 3 replies
  • 0 views
Alberto Ferraz

Hello,

I have a datagrid with a sub-datagrid where the data of the sub-datagrid are displayed when I click on one of the main lines datagrid (Figure 1).
When I change (for example) the type of document to consult, the application has to re-record the data from datagrid and sub-datagrid.
Then gives the error "NullReferenceException was unhandled".

I'm using the same instructions I use with a simple datagrid and can not correct the error.

Again I ask your help.

Figure 1

Figure 2

Best Regards

Alberto Ferraz

    3 replies

    Lanter Werner
    • Lanter Werner
    • Participating Frequently
    • September 12, 2016

    Hello,

    I have a datagrid with a sub-datagrid where the data of the sub-datagrid are displayed when I click on one of the main lines datagrid (Figure 1).
    When I change (for example) the type of document to consult, the application has to re-record the data from datagrid and sub-datagrid.
    Then gives the error "NullReferenceException was unhandled".

    I'm using the same instructions I use with a simple datagrid and can not correct the error.

    Again I ask your help.

    Figure 1

    Figure 2

    Best Regards

    Alberto Ferraz

    Hi Alberto

    What happens when you are coding something like this:

       set custGrid::ItemsSource to null

       *>  processing for setup new custList      

       set custGrid::ItemsSource to custList

    Regards

    Werner Lanter

    Alberto Ferraz
    • Alberto Ferraz
    • Author
    • Participating Frequently
    • September 12, 2016

    Hello,

    I have a datagrid with a sub-datagrid where the data of the sub-datagrid are displayed when I click on one of the main lines datagrid (Figure 1).
    When I change (for example) the type of document to consult, the application has to re-record the data from datagrid and sub-datagrid.
    Then gives the error "NullReferenceException was unhandled".

    I'm using the same instructions I use with a simple datagrid and can not correct the error.

    Again I ask your help.

    Figure 1

    Figure 2

    Best Regards

    Alberto Ferraz

    Hi Werner,

    Thanks for your response.

    Again the solution is perfect. Already implemented and no longer gives me the error.

    I was using the "invoke custGrid :: Items :: Clear ()" statement.

    A simple datagrid works well but this not with a sub-datagrid.

    Thanks again.

    Best regards

    Alberto Ferraz

    Alberto Ferraz
    • Alberto Ferraz
    • Author
    • Participating Frequently
    • September 12, 2016

    Hello,

    I have a datagrid with a sub-datagrid where the data of the sub-datagrid are displayed when I click on one of the main lines datagrid (Figure 1).
    When I change (for example) the type of document to consult, the application has to re-record the data from datagrid and sub-datagrid.
    Then gives the error "NullReferenceException was unhandled".

    I'm using the same instructions I use with a simple datagrid and can not correct the error.

    Again I ask your help.

    Figure 1

    Figure 2

    Best Regards

    Alberto Ferraz

    Hi Werner:

    Thanks for your response.

    I've applied this instruction and the program no longer gives error when you change one of the selection parameters.

    I was using the "invoke custGrid :: Items :: Clear ()" statement.

    A simple datagrid works well but this not with a sub-datagrid.

    Thanks again.

    Best regards

    Alberto Ferraz

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