How to show dialog after new selecteditem is shown in comboBox in wpf?-CodePudding

For example:I have a comboBox which has three items:AAAAA,BBBBB,CCCCC.Now the selected item is AAAAA, when I select BBBBB, selection changed event is fired. I want combobox show the current selected item (which now is BBBBB),but when messagebox show ,combobox still show AAAAA,just like the screen-shot below:

This is not what I want,I want ComboBox show BBBBB,and then the messagebox is popup. I didn't find any way to solve this problem .Can anybody help me ? Thanks!

CodePudding user response：

You can use the DropDownClosed event.

CodePudding user response：

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        
        <ComboBox x:Name="cbItem" Height="20" Width="150" SelectionChanged="cbItem_SelectionChanged"></ComboBox>
    </Grid>
</Window>



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            cbItem.Items.Add("AAAA");
            cbItem.Items.Add("BBBB");
            cbItem.Items.Add("CCCC");
        }

        private void cbItem_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var cmb = sender as System.Windows.Controls.ComboBox;
            var str = cmb.SelectedItem;
            MessageBox.Show(str.ToString());
        }
    }
}

use selection changed event and get selected item from Combobox and print it