[Gtk-sharp-list] Apparently trivial: problem casting from object to

[Fredrik Nilsson]

Hi,

Get the values like this instead:

int x = (int)m.GetValue (a, 3);
int y = (int)m.GetValue (b, 3);

and I think it will work better for you!

/Fredrik


Callum J. Bell wrote:
> I'm posting to this group because the origin of the problem is sorting 
> columns in a ListStore that is a model for a TreeView. I want to sort
> a column of integers so I started writing a sortfunction:
>
> public int int_compare(TreeModel m, TreeIter a, TreeIter b)
> {
>    GLib.Value x = new GLib.Value();
>    GLib.Value y = new GLib.Value();
>    m.GetValue(a,3,ref x);
>    m.GetValue(b,3,ref y);
>
>    // At runtime the next two lines throw:  Unhandled Exception:
>    //System.InvalidCastException: Cannot cast from source type to
>    //destination type.
>    int i = (int)(x.Val);
>    int j = (int)(y.Val);
>
>    // But x.Val does contain an integer that gets unboxed correctly
>    // here:
>    System.Console.WriteLine(">> " + x.Val + " <<");
>
>    // Never got this far...
>    //return i.CompareTo(j);
>
>    // This is for debugging
>    return 1;
> }
>
> It looks to me as if the cast should work. Any ideas? Also, if there
> are sortfunctions out there for various types I'd appreciate a pointer
> to them.
>
> Thanks
>
> Callum
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