[Mono-list] Mono Embedding - List<> enumeration

Robert Jordan robertj at gmx.net
Tue Jul 28 14:26:27 UTC 2015


On 27.07.2015 19:53, Henry wrote:
> Can anyone shed some light on the best way to enumerate a List<> using mono
> embedding?  I have a managed method that returns a List<>, I need to
> enumerate this list in c code using mono embedding.  I can't seem to find
> any documentation or examples on this that provide a definitive answer on
> how to do this.  I've tried GetEnumerator and MoveNext, but there appears to
> be some kind of issue with the generic implementations.

When it comes to accessing generic objects/classes, it's usually easier 
to implement managed helper methods than doing all the footwork in
C/C++, e.g.:

static void int GetCount(List<string> list)
	return list.Count;

static string GetElementAt(List<string> list, int pos)
	return list[pos];

Manually (in C/C++), you'd need to obtain the method
"IEnumerable_GetEnumerator" (notice the rule of building
explicit interface method names) from the class of the list
object, something like that:

MonoObject *list = ...
MonoClass *klass = mono_object_get_class (list);
MonoMethod *method = mono_class_get_method_from_name(klass,
"IEnumerable_GetEnumerator", 0);

Then invoke the method to obtain the enumerator with
mono_runtime_invoke ().


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