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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / pass IEnumerable objec...
Microsoft Dynamics AX (Archived)

pass IEnumerable object from X++ in C# method ?

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Posted on by San Artham 3,175

Hi, i have a .Net assembly which i consume in AX 2009. One of the classes in this assembly has a method which takes IEnumerable<string> as input parameter. How do i call this method from X++ ?

Eg:  In .net assembly i have
Public Static Class ClassA
  {
     .....
     .....

     public static void method1(IEnumerable<string>)
      {
      }
  }
Thanks,
San

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  • Verified answer
    Martin Dráb Profile Picture
    Martin Dráb 237,801 Most Valuable Professional on at

    Unfortunately AX doesn't work very well with generic types, often it's easier to write a proxy in .NET and expose only non-generic types to AX.

    But in your case, solution is not difficult - you can simply use an array of strings, because Array implements IList<T> and ICollection<T>, both extending IEnumerable<T>:

    System.String[] arr = new System.String[3]();
;
arr.SetValue("a", 0);
arr.SetValue("b", 1);
arr.SetValue("c", 2);
ClassA::method1(arr);
  • San Artham Profile Picture
    San Artham 3,175 on at

    perfect Martin, this works. I didn't know that Array implements IList and ICollection , looks like this changed in .Net 2.0 and it implements it only at run-time.

    Thanks again,

    San

    http://sanartham.blogspot.com/

  • Maqk Profile Picture
    Maqk 844 on at

    Martin, i benefited from your answer in my situation as well,

    but just to mention, i was not able to pass a 2 dimensionsional array. My C# method required a 2d object array, and as i passed it from X++, every time the Dynamics dev environment crashed.

    The way i fixed was to declare an Object variable in the CLR method and pass multidimensional array from X++

    Any specific reasons this mismatch ?

  • Martin Dráb Profile Picture
    Martin Dráb 237,801 Most Valuable Professional on at

    I tried it in AX2012 and I didn't experience any crashes, but AX complained about incompatible types. It was the same regardless I used System.String[,] or System.Array.

    Because the value can be successfully sent through CLRObject or System.Object instance, I guess that AX compiler is just not smart enough and doesn't recognize the type correctly. Why is it so, I don't know.

    If you're in AX2012, you can use a simple workaround - just cast the parameter by the "as" operator, e.g. SomeNetMethod(arr as System.Object).

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