WPF：无法确定焦点

Question

WPF 专注让我抓狂:(

在一个全新的测试 WPF 项目中，我有这个窗口...

<Window x:Class="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:WpfApplication1"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1*"/>
            <ColumnDefinition Width="1*"/>
        </Grid.ColumnDefinitions>
        <TextBox Grid.Column="0" x:Name="txtStatic" HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="120"/>
        <StackPanel Grid.Column="1" Focusable="False">
            <Border BorderBrush="LightGray" BorderThickness="0 0 1 0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Focusable="False">
                <ContentControl x:Name="con" />
            </Border>
        </StackPanel>
    </Grid>
</Window>

还有这个代码隐藏...

Class MainWindow

    Private Sub MainWindow_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
        Dim txt As New TextBox
        txt.Name = "txtDynamic"
        Me.con.Content = txt
        txt.Focus()
    End Sub

End Class

两个问题...

1. 当上面的项目启动并显示主窗口时，为什么我不能开始在运行时创建的文本框（txtDynamic）中输入？看起来它已经有了焦点。

1234563为什么会这样？

提前致谢。

Answer 1

将你的 contentcontrol Focusable 更改为 false

<ContentControl Focusable="False" x:Name="con" />

在后面的代码中添加，对不起，它是在 C# 中

 var txt = new TextBox();
    txt.Name = "txtDynamic";
    con.Content = txt;
    txt.Focus();

   Dispatcher.BeginInvoke(
   DispatcherPriority.ContextIdle,
   new Action(delegate()
   {
       txt.Focus();
   }));