AXForum  
Вернуться   AXForum > Microsoft Dynamics AX > DAX Blogs
All
Забыли пароль?
Зарегистрироваться Правила Справка Пользователи Сообщения за день Поиск Все разделы прочитаны

 
 
Опции темы Поиск в этой теме Опции просмотра
Старый 01.07.2017, 10:13   #1  
Blog bot is offline
Blog bot
Участник
 
25,459 / 846 (79) +++++++
Регистрация: 28.10.2006
ievgensaxblog: D365O. Trick to pass a value between Pre and Post event handler using XppPrePostArgs.
Источник: https://ievgensaxblog.wordpress.com/...ppprepostargs/
==============

Recently we came across a scenario where we needed to check if a field has changed after super() in update method of a table. Back in the days of AX 2012 you could easily compare original field’s value with current using orig() method before super() and call necessary logic after.

X++:
public void update()
{
    boolean myFieldHasChanged = this.MyField != this.orig().MyField;

    super();

    if (myFieldHasChanged)
    {
        this.doStuff();
    }
}
Now we want to do the same using extensions. We can create Pre and Post event handlers, but they are static, so we need a way to pass a value between them.
First option is to use static field, like it’s done in RunBase extension example

X++:
public static class MyTableEventHandler
{
    private static UnknownNoYes myFieldHasChanged;
 
    [PreHandlerFor(tableStr(MyTable), tableMethodStr(MyTable, update))]
    public static void MyTable_Pre_update(XppPrePostArgs _args)
    {
        MyTable myTable = _args.getThis() as MyTable;
 
        if (myTable.MyField != myTable.orig().MyField)
        {
            MyTableEventHandler::myFieldHasChanged = UnknownNoYes::Yes;
        }
        else
        {
            MyTableEventHandler::myFieldHasChanged = UnknownNoYes::No;
        }
    }
 
    [PostHandlerFor(tableStr(MyTable), tableMethodStr(MyTable, update))]
    public static void MyTable_Post_update(XppPrePostArgs _args)
    {
        MyTable myTable = _args.getThis() as MyTable;
 
        if (MyTableEventHandler::myFieldHasChanged == UnknownNoYes::Yes)
        {
            myTable.doStuff();
        }
 
        MyTableEventHandler::myFieldHasChanged = UnknownNoYes::Unknown;
    }
}
Another option is to use XppPrePostArgs as a vehicle for new parameter. XppPrePostArgs has collection of parameters under the hood, so nothing stops us to add one more and framework will take care of passing it between Pre and Post event handler!



X++:
public static class MyTableEventHandler_XppPrePostArgs
{
    const static str myFieldHasChangedArgName = 'myFieldHasChanged';
 
    [PreHandlerFor(tableStr(MyTable), tableMethodStr(MyTable, update))]
    public static void MyTable_Pre_update(XppPrePostArgs _args)
    {
        MyTable myTable = _args.getThis() as MyTable;
 
        boolean myFieldHasChanged = myTable.MyField != myTable.orig().MyField;
 
        <strong>_args.addArg(MyTableEventHandler_XppPrePostArgs::myFieldHasChangedArgName, myFieldHasChanged);</strong>
    }
 
    [PostHandlerFor(tableStr(MyTable), tableMethodStr(MyTable, update))]
    public static void MyTable_Post_update(XppPrePostArgs _args)
    {
        MyTable myTable = _args.getThis() as MyTable;
 
        <strong>boolean myFieldHasChanged = _args.getArg(MyTableEventHandler_XppPrePostArgs::myFieldHasChangedArgName);
</strong>
        if (myFieldHasChanged)
        {
            myTable.doStuff();
        }
    }
}
Using one of these approaches you should remember that static fields apply to the class, not to instances of the class, so do not mix well with concurrency. Trick with XppPrePostArgs tightly depends on current implementation, that could be changed anytime and comes with no warranty.

To overcome this and other limitations of extensions capabilities Microsoft is introducing Method wrapping and chain of command and I’m pretty sure that we’ll see blogs on this from my MVP fellows soon.




Источник: https://ievgensaxblog.wordpress.com/...ppprepostargs/
__________________
Расскажите о новых и интересных блогах по Microsoft Dynamics, напишите личное сообщение администратору.

Последний раз редактировалось mazzy; 02.07.2017 в 09:27.
 

Похожие темы
Тема Автор Раздел Ответов Посл. сообщение
How to cancel method execution in pre-event handler alicedr DAX: Программирование 6 01.01.2017 15:33
newdynamicsax: Pre / Post handlers and kernel classes. Blog bot DAX Blogs 0 25.04.2016 15:11
mscrm4ever: Expediting Plug-In Development Using VS Pre/Post Build Events Blog bot Dynamics CRM: Blogs 0 25.12.2008 15:05
wiki.dynamicsbook: Changes Made in Navision Attain 3.60 Blog bot Dynamics CRM: Blogs 0 02.09.2008 13:23
Опции темы Поиск в этой теме
Поиск в этой теме:

Расширенный поиск
Опции просмотра

Ваши права в разделе
Вы не можете создавать новые темы
Вы не можете отвечать в темах
Вы не можете прикреплять вложения
Вы не можете редактировать свои сообщения

BB коды Вкл.
Смайлы Вкл.
[IMG] код Вкл.
HTML код Выкл.
Быстрый переход

Рейтинг@Mail.ru
Часовой пояс GMT +3, время: 12:50.
Powered by vBulletin® v3.8.5. Перевод: zCarot
Контактная информация, Реклама.