WPF AutoCompleteBox DropDown宽度

Question

我有以下AutoCompleteBox：

<Controls:AutoCompleteBox x:Name="txtComponent" VerticalAlignment="Center" Height="25" FontFamily="Segoe UI" MinimumPrefixLength="2"
                TextSearch.TextPath="Value" SelectedItem="{Binding Path=Selected, Mode=TwoWay}" IsTextCompletionEnabled="True"
                FontSize="13.333" Grid.Row="0" Grid.Column="1" DropDownClosing="txtComponent_DropDownClosing">
    <Controls:AutoCompleteBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Path=SiteName}"/>
        </DataTemplate>
    </Controls:AutoCompleteBox.ItemTemplate>
</Controls:AutoCompleteBox>

问题是，建议下拉列表超出了限制范围。

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如何设置DropDown列表的最大宽度？

Answer 1

试试这个：

<TextBlock Text="{Binding Path=SiteName}" Width="{Binding ElementName=txtComponent, Path=ActualWidth}"/>

它应该遍历树并将下拉宽度绑定到父宽度。