Casting from ArrayList CLRObject to an AX class object

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Posted on by Andre Tschaffon

Hey guys,

I need a data structure that allows me to do usual and reversal iteration, so I am using the System.Collections.ArrayList to store elements from my FBGiaRecordChildren_BR class .

My code is running on IL and I am having a Casting problem while trying to do this:

FBGiaRecordChildren_BR recordChildren;

int i, size;

size = recordChildrenList.get_Count();

for( i = size-1 ; i >= 0 ; i--)

{

recordChildren = recordChildrenList.get_Item(i);

if (recordChildren.getRecord() == _parentType)

{

return recordChildren;

}

Error: System.InvalidCastException: Unable to cast object of type 'Microsoft.Dynamics.AX.ManagedInterop.Object' to type 'Dynamics.Ax.Application.FBGiaRecordChildren_BR'.

I've already tryed to use CLRInterop::getAnyTypeForObject, but doesn't help me:

FBGiaRecordChildren_BR recordChildren;

CLRObject obj;

int i, size;

size = recordChildrenList.get_Count();

for( i = size-1 ; i >= 0 ; i--)

{

recordChildren = recordChildrenList.get_Item(i);

recordChildren = CLRInterop::getAnyTypeForObject(obj);

if (recordChildren.getRecord() == _parentType)

{

return recordChildren;

}

I would be very thankful if anyone could help me.

Thanks a lot!

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Martin Dráb 237,882 Most Valuable Professional on at

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The second piece of code still contains the same problem. The assignment recordChildren = recordChildrenList.get_Item(i) is invalid because you can't safely assign any Object to a variable of FBGiaRecordChildren_BR type. There is no guarantee that get_Item(i) returns a type compatible with FBGiaRecordChildren_BR.

Nevertheless you can cast the value to the right type using the as operator:

recordChildren = recordChildrenList.get_Item(i) as FBGiaRecordChildren_BR; if (!recordChildren) { throw error(...); }

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Philip Leitch 104 on at

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I faced the same problem. The code worked perfectly in client side, but failed on the AOS Batch server.

I tracked the problem down to the variable that comes out when run on the AOS (running on CIL) comes out as a type of Object, whereas it comes out as the correct AX type when run as client.

AX can't cast from Object to an AX type and that's why the error happens. Putting in a Cast doesn't fix it, the same error happens.

I attempted to change the type of the variable using System.Convert::ChangeType, however the it doesn't have IConvertable interface.

In other words - we can't do anything about the object once it comes out, however there is a solution: change how the variable goes IN. I replaced both the key and the variable with .Net variables:

System.String Key;
System.Object oVar;

I don't believe the key was necessary but the System.Object on the variable was. In this instance (below) I'm using a sorted list.

Key = CurrEmployee.parmEmployeeID();

oVar = CurrEmployee;

Employees.Add(Key, oVar);

By first marshaling the class into a .Net class it gains the appropriate AX type. If you just pass the class in directly (which works perfectly well in non CIL executed code) it doesn't gain the AX type.

Once you fix how the data goes in the exception goes away. From what I've found this is the ONLY way to fix the issue due to the lack of ability to cast or convert the output of Get_Item.

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