如何设置Gtk.ComboBox的值？

Question

我能想到的只是与ComboBox.GetEnumerator或类似的东西有关.

我想做的事情如下:

System.Collections.IEnumerator e = this.task_difficulty_combobox.GetEnumerator();
while (e.MoveNext())
{
    if (e.ToString() == this.task.Difficulty.ToString())
    {
        Gtk.TreeIter i = (Gtk.TreeIter)e.Current;
        this.task_difficulty_combobox.SetActiveIter(i);
        break;
    }
}

但是,这不起作用.

Answer 1

你的代码不起作用的原因是"组合框中的项目"实际上是用于显示数据列的单元格渲染器.要获取实际数据,您需要TreeModel对象.

如果你真的必须只根据组合中的内容进行选择,那么你可以这样做:

string[] values = new string[]{"one", "two", "three"};
var combo = new ComboBox(values);

Gtk.TreeIter iter;
combo.Model.GetIterFirst (out iter);
do {
  GLib.Value thisRow = new GLib.Value ();
  combo.Model.GetValue (iter, 0, ref thisRow);
  if ((thisRow.Val as string).Equals("two")) {
    combo.SetActiveIter (iter);
    break;
  }
} while (combo.Model.IterNext (ref iter));

但是,通常将您的值保持索引更为简洁,如下所示:

List<string> values = new List<string>(){"one", "two", "three"};  
var combo = new ComboBox(values.ToArray());

// Select "two"
int row = values.IndexOf("two");
Gtk.TreeIter iter;
combo.Model.IterNthChild (out iter, row);
combo.SetActiveIter (iter);