以编程方式更改WPF可编辑ComboBox的背景颜色

问题描述：

我正在尝试在运行时使用代码动态更改可编辑的 ComboBox 的背景颜色。特别是，我想更改可编辑 TextBox 的背景，该文本框是 ComboBox 的一部分。

I'm trying to dynamically change the background color of an editable ComboBox at runtime, using code. In particular, I want to change the background of the editable TextBox that is part of the ComboBox.

关于SO的答案有几个，就像这样：

There are several answers about this on SO, like this one:

WPF在代码中更改可编辑组合框的背景颜色

但是，问题是它们都基于 XAML 并编辑默认模板。我不想这样做，我正在寻找一种只适用于代码的通用解决方案。

however, the problem is that they're all based on XAML and editing default templates. I don't want to do that, I'm searching for a generic solution that works with just code.

有可能吗？我尝试了看似显而易见的解决方案：

Is it possible? I tried the solution that seems obvious:

TextBox textBox = (TextBox)comboBox.Template.FindName("PART_EditableTextBox", comboBox);
textBox.Background = Brushes.Yellow;

但这绝对没有作用。我缺少什么？

But this does absolutely nothing. What am I missing?

答

这是您可以做到的方式

<ComboBox Loaded="MyCombo_OnLoaded"  x:Name="myCombo" IsEditable="True"></ComboBox>

private void MyCombo_OnLoaded(object sender, RoutedEventArgs e)
{
      var textbox = (TextBox)myCombo.Template.FindName("PART_EditableTextBox", myCombo);
      if (textbox!= null)
      {
           var parent = (Border)textbox.Parent;
           parent.Background = Brushes.Yellow;
       }
}

以编程方式更改WPF可编辑ComboBox的背景颜色

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