[Dynamics AX] CLR return Null in X + +

When we want to return NULL in X + + and assign it to a CLR object, it'll throw out a issue that "Microsoft Dynamics any Type cannot was marshaled to the CLR Object ", this is because null in X + + is anytype. So if we want to return null and assign it to a CLR object, we should know the type of the CLR object (refer which class) . Then we can use following code:

Return Clrinterop::null ("system.xxxx");

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[Dynamics AX] CLR return Null in X + +