Microsoft Dynamics AX (Archived)

Passing and consuming C# List in AX 2012 (X++)

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Posted on by Ariston J.

Hi All,

How should I pass List object in C# to X++?

For Example,

In C# Managed Code:

public List<String> GetStringList()
{

List<String> list = new List<String>();

list.Add("One");
list.Add("Two");
list.Add("Three");

return list;

}

In X++: AX 2012 R3

static void Job9(Args _args)
{
ABJNewtonsoftJson.Program program;
List list = new List(Types::String);
ListEnumerator enumerator;
System.String netEmement;
str val1, val2;
;

program = new ABJNewtonsoftJson.Program();

list = program.GetStringList();
enumerator = list.getEnumerator();

while (enumerator.moveNext())
{
netEmement = enumerator.current();
val1 = netEmement;
}
}

// It seems like, I'm hitting error in below X++ lines:

enumerator = list.getEnumerator();

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Martin Dráb 237,961 Most Valuable Professional on at

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You can't assign a .NET list to the X++ List class; they're completely different types. This kind of things can't ever work.

Also, working with generic types is a bit difficult, so I suggest you either redesign your solution not to expose generic types, or use the non-generic System.Collections.IEnumerable interface as the type of your list variable.

By the way, please separate tags with commas; you attached a single tag Passing and consuming C# List in AX 2012 (X++), which didn't work very well as a list of related topics.

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Mariano Gracia on at

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Working with c# lists in x++ is just weird, in my case I needed to do it because I was consuming an external service wich uses lists, this code should work:

ClrObject list = new ClrObject("System.Collections.Generic.List`1[System.String]"); ClrObject enumerator; str val1; ... list = program.GetStringList(); enumerator = list.GetEnumerator(); while (enumerator.MoveNext()) { val1 = enumerator.get_Current(); }

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Martin Dráb 237,961 Most Valuable Professional on at

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I prefer System.Collections.IEnumerable because I can avoid CLRObject and hardcoded type names and I'll get IntelliSense and compile-time control.

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