为什么我的WPF TabControl会自动切换标签?

时间:2016-12-09 15:54:47

标签: c# wpf

TabControl中有3个标签:

  1. Tab1包含"下一个"按钮。
  2. 当"接下来"单击TabControl设置为显示Tab2并启动计时器(2秒)
  3. 计时器结束后TabControl设置为显示Tab3
  4. 如果包含TabControl的窗口在#3发生时没有焦点,它将在收到焦点时切换回显示Tab2。为什么呢?

    MainWindow代码:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading;
    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 WpfApplication1
    {
        /// <summary>
        /// Interaction logic for MainWindow.xaml
        /// </summary>
        public partial class MainWindow : Window
        {
            public MainWindow()
            {
                InitializeComponent();
            }
    
            private void NextBtn_Click(object sender, RoutedEventArgs e)
            {
                DoStuff();
            }
    
            private async void DoStuff()
            {
                MainTabControl.SelectedItem = Tab2;
    
                await Task.Factory.StartNew((Action)(() =>
                {
                    Thread.Sleep(2000);
                }));
    
                MainTabControl.SelectedItem = Tab3;
            }
        }
    }
    

    WPF代码:

    <Window x:Class="WpfApplication1.MainWindow"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            Title="MainWindow" Height="350" Width="525" Topmost="True">
        <TabControl Name="MainTabControl">
            <TabItem Name="Tab1">
                <TabItem.Header>
                    <TextBlock Text="Tab 1" />
                </TabItem.Header>
                <StackPanel>
                    <TextBlock Text="Tab 1 content" />
                    <Button Name="NextBtn" Click="NextBtn_Click" Content="Next tab" Width="50" HorizontalAlignment="Right" />
                </StackPanel>
            </TabItem>
    
            <TabItem Name="Tab2">
                <TabItem.Header>
                    <TextBlock Text="Tab 2" />
                </TabItem.Header>
                <StackPanel>
                    <TextBlock Text="Tab 2 content" />
                </StackPanel>
            </TabItem>
    
            <TabItem Name="Tab3">
                <TabItem.Header>
                    <TextBlock Text="Tab 3" />
                </TabItem.Header>
                <StackPanel>
                    <TextBlock Text="Tab 3 content" />
                </StackPanel>
            </TabItem>
        </TabControl>
    </Window>
    

    完整项目:https://ufile.io/165121

1 个答案:

答案 0 :(得分:1)

我用Snoop对你的程序进行了调试,当你打电话给我时,我看到了 MainTabControl.SelectedItem = Tab3;并且您将焦点放在其他窗口中,tab2是聚焦所以当您选择程序的窗口时,会显示tab2。

我修复了它添加第二行:

MainTabControl.SelectedItem = Tab3;
((TabItem) MainTabControl.SelectedItem).Focus();

我希望这可以帮到你。