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WPF: XamlParserException for a very simple form?

I don't believe this: just built a very simple single list form, when the user selects one item, the selection will be displayed on the label. Here is my code:

<Window x:Class="WpfApplication8.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <ComboBox Height="23" Margin="139,0,19,14" Name="comboBox1" Text="Worker"
                  VerticalAlignment="Bottom" IsReadOnly="True" SelectionChanged="comboBox1_SelectionChanged">
            <ComboBoxItem Name="None" Selector.IsSelected="True">Select Target</ComboBoxItem>
            <ComboBoxItem Name="Alice">Alice</ComboBoxItem>
            <ComboBoxItem Name="Bob">Bob</ComboBoxItem>
            <ComboBoxItem Name="Chris">Chris</ComboBoxItem>
            <ComboBoxItem Name="Dan">Dan</ComboBoxItem>
        </ComboBox>
        <Label Height="28" Margin="15,0,0,14" Name="label1" 
               VerticalAlignment="Bottom" Content="Assign to: " HorizontalAlignment="Left" Width="120"></Label>
    </Grid>
</Window>

Code behind:

private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    label1.Content = comboBox1.SelectedValue;
}
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3 answers


Another way also, if you don't want to check if the label is null, add a selection change handler after loading the window, since it runs it before loading the label:

Code for:

    public Window1()
    {
        InitializeComponent();
        this.Loaded += new RoutedEventHandler(Window1_Loaded);
    }

    void Window1_Loaded(object sender, RoutedEventArgs e)
    {
        comboBox1.SelectionChanged+=new SelectionChangedEventHandler(comboBox1_SelectionChanged);
    }

    protected void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        label1.Content = ((ComboBoxItem)comboBox1.Items[comboBox1.SelectedIndex]).Content;
    }


Markup:

<Grid>
    <ComboBox Height="23" Margin="139,0,19,14" Name="comboBox1" Text="Worker"
              VerticalAlignment="Bottom" IsReadOnly="True">
        <ComboBoxItem Name="None" Selector.IsSelected="True">Select Target</ComboBoxItem>
        <ComboBoxItem Name="Alice">Alice</ComboBoxItem>
        <ComboBoxItem Name="Bob">Bob</ComboBoxItem>
        <ComboBoxItem Name="Chris">Chris</ComboBoxItem>
        <ComboBoxItem Name="Dan">Dan</ComboBoxItem>
    </ComboBox>
    <Label Height="28" Margin="15,0,0,14" Name="label1" 
           VerticalAlignment="Bottom" Content="Assign to: " HorizontalAlignment="Left" Width="120"></Label>
</Grid>

Andrew

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Here's a simplified version of everything in xaml:



<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel>  
          <ComboBox Name="comboBox1" Text="Worker" IsSynchronizedWithCurrentItem="True"
                  VerticalAlignment="Bottom" IsReadOnly="True" >
            <ComboBoxItem Name="None" Selector.IsSelected="True">Select Target</ComboBoxItem>
            <ComboBoxItem Name="Alice">Alice</ComboBoxItem>
            <ComboBoxItem Name="Bob">Bob</ComboBoxItem>
            <ComboBoxItem Name="Chris">Chris</ComboBoxItem>
            <ComboBoxItem Name="Dan">Dan</ComboBoxItem>
        </ComboBox>
        <Label Name="label1" DataContext="{Binding ElementName=comboBox1, Path=SelectedItem}"
               VerticalAlignment="Bottom" Content="{Binding Name}" HorizontalAlignment="Left"></Label>

  </StackPanel>
</Page>
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The following works:

    protected void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (label1 != null)
            label1.Content = ((ComboBoxItem)comboBox1.Items[comboBox1.SelectedIndex]).Content;
    }

Andrew

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