c# - 如何绑定列表框中选定值的主键？

Question

我正在使用 listBox 来显示搜索值的结果。我希望在搜索一个值后，用户将从搜索结果中选择一个值，其 ID 即 PK(Primaray Key) 应该传递给选定的结果而不是该选定的项目。http://i.stack.imgur.com/NaiK0.png例如，在附加图片中，我希望当用户点击“assignment7”时，它的 id 值（即8 ）应该传递给选定的结果字段。我该怎么做。需要你的指导。谢谢你！

这里我的代码是：

    <ListBox Grid.Row="1" SelectionMode="Single" SelectionChanged="PrintText" Background="DarkGray" Visibility="Collapsed"  Height="Auto" HorizontalAlignment="Left" Margin="156,36,0,0" Name="listBox1" VerticalAlignment="Top" Width="191" UseLayoutRounding="True" />
  <Grid>
<TextBlock Grid.Row="1" HorizontalAlignment="Left" Margin="12,12,0,0" x:Name="textBlock1"  Text="For Search Type here" VerticalAlignment="Top" Height="auto" Width="auto" Foreground="White" />
        <TextBox Grid.Row="1" HorizontalAlignment="Left" Margin="156,12,0,246" x:Name="textBox1" Width="191" TextWrapping="NoWrap" TextChanged="textBox1_TextChanged" />
        <ListBox Foreground="White" Grid.Row="1" SelectionMode="Single" SelectionChanged="PrintText" Background="DarkGray" Visibility="Collapsed"  Height="Auto" HorizontalAlignment="Left" Margin="156,36,0,0" Name="listBox1" VerticalAlignment="Top" Width="191" UseLayoutRounding="True" />
        <TextBox Grid.Row="1" Height="16" HorizontalAlignment="Left" Margin="389,0,0,248" x:Name="txtSelectedItem" VerticalAlignment="Bottom" Width="91" Grid.ColumnSpan="2" />
    </Grid>

  private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
        {

  string typedstring= textBox1.Text;
List<string> autolist= new List<string>();
foreach(string b in al)
{
if(!string.IsNullOrEmpty(textBox1.Text))
{
if(b.StartsWith(typedstring))
{
autolist.Add(b);
}
}
}
if(autolist.Count>0)
{
    listBox1.ItemsSource = autolist;
    listBox1.Visibility = Visibility.Visible;

}
else if (textBox1.Text.Equals (""))
{

    listBox1.Visibility = Visibility.Collapsed;
    listBox1.ItemsSource = null;
}

else
{

    listBox1.Visibility = Visibility.Collapsed;
    listBox1.ItemsSource = null;
}


        }

        private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
             selectedItemsId = (int)listBox1.SelectedValue;
            if (listBox1.ItemsSource != null)
            {
                listBox1.Visibility = Visibility.Collapsed;
                textBox1.TextChanged += new TextChangedEventHandler(textBox1_TextChanged);
            }

            if (listBox1.SelectedIndex != -1)
            {
                textBox1.Text = listBox1.SelectedItem.ToString();
                textBox1.TextChanged += new TextChangedEventHandler(textBox1_TextChanged);
            }
        }
        void PrintText(object sender, SelectionChangedEventArgs args)
        {


             Window1 neww = null;
             neww = new Window1();
             neww.Title = selectedItemsId.ToString();
             neww.Show();
        }



        private void SetupListBox()
        {
            List<Assignment> lst = new List<Assignment>();


            listBox1.ItemsSource = lst;
            //This is what will be displayed
            listBox1.DisplayMemberPath = "assignment_title";
            //This is what will set the selected value to the property you want
            listBox1.SelectedValuePath = "assignment_id";
        }

Answer 1

将选择值路径设置为PK字段，然后使用选择值获取当前值

 class Example
    {
        public int id { get; set; }
        public string Name { get; set; }
    }

    private void SetupListBox()
    {
        List<Example> lst = new List<Example>();
        lst.Add(new Example { id = 1, Name = "First Item" });
        lst.Add(new Example { id = 2, Name = "Second Item" });
        lst.Add(new Example { id = 3, Name = "Third Item" });

        listBox1.ItemsSource = lst;
        //This is what will be displayed
        listBox1.DisplayMemberPath = "Name";
        //This is what will set the selected value to the property you want
        listBox1.SelectedValuePath = "id";
    }

    private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        //Get the selected Items id property
        int selectedItemsId = (int)listBox1.SelectedValue;
    }