Xamarin - IOS UIPickerView - 调用Select方法不会触发Selected事件处理程序

Question

我按照以下方式创建UIPickerView UIPickerView pv = new UIPickerView(new CoreGraphics.CGRect(10, 20, 100, 70));

点击按钮，我调用以下内容。

public void HandleClick(object sender, EventArgs e)
    {
        int index = (int)pv.SelectedRowInComponent(0);

        if (index == 0)
            index = 1;
        else if (index == 1)
            index = 2;
        else if (index == 2)
            index = 0;

        pv.Select(index, 0, false);

    }

上面代码中的最后一行不会触发Selected事件，但如果我通过与UI交互自行更改UIPickerView选项，则会调用Selected。

这是我的UIPickerViewModel类。

    public class PickerModel : UIPickerViewModel
{
    string[] values = new string[] {"Item 1", "Item 2","Item 3" };
    public event EventHandler ItemSelected;

    public override nint GetRowsInComponent(UIPickerView pickerView, nint component)
    {
        return values.Length;
    }

    public override nint GetComponentCount(UIPickerView pickerView)
    {
        return 1;
    }

    public override string GetTitle(UIPickerView pickerView, nint row, nint component)
    {
        return values[(int)row].ToString();
    }

    public override void Selected(UIPickerView pickerView, nint row, nint component)
    {
        ItemSelected(pickerView, EventArgs.Empty);
    }

}

这是预期的行为，还是我需要做一些不同的事情来触发Selected事件？在Android中，在代码触发器中设置Spinner的选定索引。