Xamarin.Forms中Picker上的OnChangeListener

Question

我有两个采摘和我有每个SelectedItem从采摘 ，但每当我改变有价值观为何他们不解雇我的方法？

以下是我的代码：

这就是我声明每个选取器的选定索引的方式：

int selectedIndexYear = year_pk.SelectedIndex;
int selectedIndexTerm = term_pk.SelectedIndex;

这是每当我更改选择器时触发的逻辑，但是不起作用：

if (selectedIndexYear != -1 && selectedIndexTerm != -1)
{
    int term = Int32.Parse(term_pk.SelectedItem.ToString());
    //Below  is my method am Firing Each change of the Picker.
    OnResultsList(year_pk.SelectedItem.ToString(), term);
}

Answer 1

根据这种情况，我看到您希望在选择器上选择的项目发生更改时都触发事件。

我建议您使用SelectedIndexChanged事件，如下所示：

year_pk.SelectedIndexChanged += delegate 
{
    int term = Int32.Parse(term_pk.SelectedItem.ToString());
    //Below  is my method am Firing Each change of the Picker.
    OnResultsList(year_pk.SelectedItem.ToString(), term);
}

term_pk.SelectedIndexChanged += delegate 
{
    int term = Int32.Parse(term_pk.SelectedItem.ToString());
    //Below  is my method am Firing Each change of the Picker.
    OnResultsList(year_pk.SelectedItem.ToString(), term);
}