WPF 在代码中更改可编辑组合框的背景颜色

问题描述

我需要在代码中设置可编辑的 combobox 的背景颜色.这是我所拥有的，但不会改变颜色:

I need to set the background color of an editable combobox in code. This is what I have but does not change the color:

        ComboBox comboBox = sender as ComboBox;
        comboBox.Background = Brushes.PeachPuff;

        if (comboBox.IsEditable == true)
        {
            TextBox textBox = (TextBox)comboBox.Template.FindName("PART_EditableTextBox", comboBox);
            if (textBox != null)
            {
                textBox.Background = Brushes.PeachPuff;

            }
        }

我原以为背景颜色会更改为 PeachPuff(浅橙色)，但没有任何反应 - 有什么想法吗?

I was expecting the background color to change to PeachPuff (light orange) but nothing happens - any ideas?

推荐答案

使用 background 属性更改 combobox 的 background 仅使用要在 Win7 及更早版本中工作，在 Windows 8 及更高版本中，ComboBox 的默认模板已更改，以修复您应该编辑默认模板的问题，

Changing the combobox's background using the background property only use to work in Win7 and older, in windows 8 and above the default template for the ComboBox has been changed, to fix that you should edit the default template,

1. 使用 VisualStudio 2013 或 Blend，右键单击 combobox 并选择 EditTemplate > Edit a Copy:

1. using VisualStudio 2013 or Blend, Right Click the combobox and choose EditTemplate > Edit a Copy :

1. 在生成的 Xaml 中搜索 并替换 {StaticResource ComboBox.Static.Background}code> 将 TemplateBinding 标记为 Background 属性，更新后您的代码应如下所示:

1. In the generated Xaml search for <ControlTemplate TargetType="{x:Type ToggleButton}"> and replace the {StaticResource ComboBox.Static.Background} markup with a TemplateBinding to the Background property, your code should look like this after the update :

 ...
  <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ToggleButton}">
                <Border x:Name="templateRoot" BorderBrush="{StaticResource ComboBox.Static.Border}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                    <Border x:Name="splitBorder" BorderBrush="Transparent" BorderThickness="1" HorizontalAlignment="Right" Margin="0" SnapsToDevicePixels="true" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
                        <Path x:Name="arrow" Data="F1 M 0,0 L 2.667,2.66665 L 5.3334,0 L 5.3334,-1.78168 L 2.6667,0.88501 L0,-1.78168 L0,0 Z" Fill="{StaticResource ComboBox.Static.Glyph}" HorizontalAlignment="Center" Margin="0" VerticalAlignment="Center"/>
                    </Border>
                </Border>
                <ControlTemplate.Triggers>
                    <MultiDataTrigger>
                     ...

现在，您可以使用 Background 属性来更改 Combobox 颜色:

<Grid>
  <ComboBox IsEditable="True" x:Name="EditableComboBox" Background="PeachPuff" VerticalAlignment="Center" HorizontalAlignment="Center" Width="200" Style="{DynamicResource ComboBoxStyle1}" >
  </ComboBox>
</Grid>

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