WPF MVVM:整数的ComboBox高度不同

private List<int> _integerList;
public List<int> IntegerList
{
    get { return _integerList; }
    set
    {
        _integerList = value;
        OnPropertyChanged(nameof(IntegerList));
    }
}

public MyViewModel()
{
    IntegerList = new List<int>
    {
        1, 2, 3, 4, 5
    };
}

<ComboBox ItemsSource="{Binding IntegerList}">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding}">
                <TextBlock.Style>
                    <Style TargetType="TextBlock">
                        <Setter Property="Height" Value="20"/>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding}" Value="3">
                                <Setter Property="Height" Value="30"/>
                            </DataTrigger>
                            <DataTrigger Binding="{Binding}" Value="5">
                                <Setter Property="Height" Value="40"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </TextBlock.Style>
            </TextBlock>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>