我有一个名为LIstBoxItem的类,其中包含对象A。稍后,我会尝试接近该对象。为了做到这一点,我试图做铸造,但它返回null。我的意思是选择=空。我想知道为什么以及如何解决它
class ListBoxItem
{
A my_A;
public ListBoxItem(A i_A)
{
my_A = i_A
}
public override string ToString()
{
return my_A.FirstName + " " + my_A.LastName;
}
}
A m_CurrentA = new A( str1, str2 , , ,);
ListBoxItem new_ListBoxItem = new ListBoxGuestsItem(m_CurrentA);
this.listBox1.Items.Add(new_ListBoxItem);
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
ListBoxItem selected = sender as ListBoxItem;
...
}
发件人不是选定的对象,您必须直接从listBox获取选定的对象:
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
ListBoxItem selected = listBox1.selectedItem as ListBoxItem;
}
或者
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
ListBoxItem selected = listBox1.Items[listBox1.selectedIndex] as ListBoxItem;
}
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