[mono-android] problem with a Javalist (ArrayAdapter)

[Jonathan Pryor]

On Jan 5, 2012, at 9:36 AM, John Murray wrote:
> The array is a list of list  thus List<List<string>>()

Is it really a List<List<string>>? Conceptually, sure, but actually?

>  So I come to the click handler and want to extract the ‘Keyno’ from the array of the line selected
>  
> I’ve got this code
>    private void loglist_ItemClick(object sender, ItemEventArgs e)
>         {
>             int pos = Convert.ToInt32(e.Id);
>             var selitem = loglist.Adapter.GetItem(pos);

What is the type of `loglist`? Of `loglist.Adapter`? Are you providing your own Adapter (by e.g. subclassing BaseAdapter), or are you using e.g. ArrayAdapter<T>?

`selitem` is very probably a Java.Lang.Object, as that's what BaseAdapter.GetItem(int) returns.

>             var selitem2 = selitem.ToArray<string>();
>             string sel2 = selitem2.ElementAt(0).ToString();
>  
> Sorry about the various selitems I’ve been trying everything – the debugger tells me that the selitem is a JavaList

The debugger knows about the runtime types involved. The compiler does not. It sounds like you might be misunderstanding `var`. Your statement:

	var selitem = loglist.Adapter.GetItem(pos);

is treated identically by the compiler as:

	Java.Lang.Object selitem = loglist.Adapter.GetItem(pos);

`var` is not `dynamic`. :-)

If `selitem` is a JavaList, and you want to grab elements from it, cast it:

	JavaList selitems = (JavaList) loglist.Adapter.GetItem(pos);
	string sel2 = selitems[0].ToString();

Thanks,
 - Jon