我们如何在运行时向Windows Metro风格应用程序中的ListBox控件添加新项?
我来自WinForms,所以你可以想象,我现在很困惑。
我有以下内容:
public class NoteView
{
public string Title { get; set; }
public string b { get; set; }
public string c { get; set; }
}
然后:
List<NoteView> notes = new List<NoteView>();
protected void Button1_Click(object sender, RoutedEventArgs e)
{
notes.Add(new NoteView {
a = "text one",
b = "whatevs",
c = "yawns"
});
NotesList.ItemsSource = notes;
}
哪个没用。它什么都不做。此外,“输出”窗口中没有任何内容。没有错误,没有例外;什么都没有。
所以,然后我尝试直接添加到ListBox:
NotesList.Items.Add("whatever!");
再一次,什么也没发生。所以我尝试添加UpdateLayout();
,但这也无济于事。
有人知道这是怎么回事吗?
我们如何向XAML ListBox添加新项目?
<ListBox Name="NotesList" Background="WhiteSmoke">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Title, Mode=TwoWay}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
答案 0 :(得分:0)
你必须以不同的方式做到这一点,你不能只是将所有属性设置为listBox。 所以创建这种类:
public class NoteView
{
public string Item { get; set; }
public int Value { get; set; }
}
这就是按钮点击事件中的代码:
List<NoteView> notes = new List<NoteView>();
notes.Add(new NoteView { Item = "a", Value = 1 });
notes.Add(new NoteView { Item = "b", Value = 2 });
notes.Add(new NoteView { Item = "c", Value = 3 });
listBox1.DataSource = notes;
listBox1.DisplayMember = "Item";
listBox1.ValueMember = "Value";
- 否则,如果您要使用与您创建的相同的类,那么您可以这样做:
List<NoteView> notes = new List<NoteView>();
notes.Add(new NoteView
{
a = "text one",
b = "whatevs",
c = "yawns"
});
listBox1.Items.Add(notes[0].a);
listBox1.Items.Add(notes[0].b);
listBox1.Items.Add(notes[0].c);
答案 1 :(得分:0)
List<NoteView> notes = new List<NoteView>();
protected void Button1_Click(object sender, RoutedEventArgs e)
{
notes.Add(new NoteView {
a = "text one",
b = "whatevs",
c = "yawns"
});
NotesList.DisplayMember = "a";
NotesList.ValueMember = "b";
NotesList.ItemsSource = notes;
}
答案 2 :(得分:0)
我设法弄明白该怎么做:
notes.Insert(0, new NoteView { a = "Untitled note", b = "", c = "" });