-1

I have a WPF ComboBox that binds to a set of data. I do not have permissions to modify the control directly, nor can I change the data.

I'm returned 1 item in my ComboBox, but there are actually 2 rows; the blank row and my expected value. Both appear to have an index value of 0. I don't want to see this blank row, just my expected data in the ComboBox auto-selected. I have looked through everyone's related posts in here, but none of the solutions have worked for my case. I have been programming for a long time, but still fairly new to WPF. Thanks for the help.

XAML

<MyComboBox Name="myTemplate5" MyLookup="Lookup" MyFilter="att_idn=-37" MyData="Detail" MyName="comp_tmpl_idn_srt" ModCde="31" MyEmptyValue="0" ToolTip="Have a nice day" Margin="0,2.5,30,2.5" MinWidth="120" Grid.Column="1"  SelectionChanged="myTemplate5_SelectionChanged" />

C#

private void myTemplate1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    MyComboBox work = sender as MyComboBox;
    if (work != null && work.HasSelectionChanged(e))
    {
        int compTmplId = int.Parse(work.SelectedValue.ToString());
        if (!_wpfIsDumb && !ChangeComponent(compTmplId))
        {
            _wpfIsDumb = true;
            work.SelectedItem = e.RemovedItems[0];
            _wpfIsDumb = false;
        }
    }
}

public bool HasSelectionChanged(SelectionChangedEventArgs e)
{
    if (e.RemovedItems.Count > 0 && e.AddedItems.Count > 0)
        return true;
    else
        return false;
}
4

2 に答える 2

2

私は解決策を見つけました。選択したインデックスが機能しませんでした。問題はデータにありました。ボックスにNULL値が渡されていました。SQLからNULLリターンを取り除いたら、期待どおりに機能しました。

于 2012-12-12T19:26:15.170 に答える
1

これは、SelectedIndexを0に設定することで実現できます。

XAML：

<ComboBox Name="myCB" 
                  SelectedIndex="0"
                  MaxWidth="200" MaxHeight="25" />

コードビハインド：

namespace nsComboBox
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            myCB.Items.Add("Item 1");
            myCB.Items.Add("Item 2");
            myCB.Items.Add("Item 3");

            myCB.SelectedIndex = 0;
        }     
    }
}
于 2012-07-11T23:51:12.013 に答える