How To Use the SysPackExtension Class to Pack Additional Fields in Dynamics 365 Finance and Operations
If you are working with x++ development language in Dynamics 365 Finance and Operations and need to extend a class that implements packing to pack some additional fields, you might be wondering how to do it safely.
In this blog post, I will show you how to use the SysPackExtension class to achieve this.
The SysPackExtension class is a helper class that allows you to add fields to a packed class without modifying the original class. It works by utilizing the chain of command on the pack and unpack methods to add to the packed container a container of your fields where the first elements in the container are the version and the name of your extension class.
For example, the original container could look like [1, 2, 3] and you want to add 4 to that. The result would be something like [1, 2, 3, [1, “SomeBaseClass_Extension”, 4]].
Here is an example:
[ExtensionOf(classStr(SalesOrderCopyingContract))]
internal final class SSISalesOrderCopyingContract_Extension
{
public NoYes createNewOrder;
public int newOrdersToCreate;
#define.CurrentVersion(1) // same as base class
#localMacro.CurrentList
createNewOrder,
newOrdersToCreate
#endMacro
public container pack()
{
container retContainer = next pack();
container conValues = [#CurrentVersion, #CurrentList];
return SysPackExtensions::appendExtension(retContainer, classStr(SSISalesOrderCopyingContract_Extension), conValues);
}
public boolean unpack(container _packedClass)
{
boolean retValue = next unpack(_packedClass);
if(retValue)
{
container packedExtension = SysPackExtensions::findExtension(_packedClass, classStr(SSISalesOrderCopyingContract_Extension));
if(conLen(packedExtension) > 0)
{
Integer version = RunBase::getVersion(packedExtension);
switch(version)
{
case #CurrentVersion:
[version, #CurrentList] = packedExtension;
Default:
retValue = false;
}
}
}
return retValue;
}
}
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