如何改变ComboBox的边框颜色使用代码？ [英] How to change Border color of ComboBox using code?

问题描述

我有一个ComboBox，我想将边框的颜色更改为红色，以将其标记为必填字段。我通过我的代码动态生成这个ComboBox列。

  DataGridTemplateColumn dataGridComboBoxTemplateColumnObj = new DataGridTemplateColumn（）; 
 dataGridComboBoxTemplateColumnObj.Header = column.Header; 
 FrameworkElementFactory comboBoxFactory = new FrameworkElementFactory（typeof（ComboBox））; 
 Binding bindingItemSourceObj = new Binding（column.ItemsSourcePropertyName）; 
 comboBoxFactory.SetValue（ComboBox.Horizo​​ntalAlignmentProperty，Horizo​​ntalAlignment.Stretch）; 
 comboBoxFactory.SetValue（ComboBox.ItemsSourceProperty，bindingItemSourceObj）; 
 comboBoxFactory.SetValue（ComboBox.SelectedValuePathProperty，column.ValuePropertyName）; 
 
 Binding selectedValueBindingObj = new Binding（column.PropertyName）; 
 selectedValueBindingObj.Mode = BindingMode.TwoWay; 
 selectedValueBindingObj.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged; 
 comboBoxFactory.SetValue（ComboBox.SelectedValueProperty，selectedValueBindingObj）; 
 dataGridComboBoxTemplateColumnObj.CellTemplate = new DataTemplate（）; 
 dataGridComboBoxTemplateColumnObj.CellTemplate.VisualTree = comboBoxFactory; 
 dataGridColumnObj = dataGridComboBoxTemplateColumnObj; 
  

解决方案

如果你有一个 ComboBox ：

 < ComboBox x：Name =MyComboBox/> 
  

您可以设置 Border.BorderBrushProperty ：

  MyComboBox.SetValue（Border.BorderBrushProperty，Brushes.Red）; 
  

以这种方式，您可以更改 ComboBox ：
我为您的特定 FrameworkElementFactory 添加了此示例。 / code>：

  FrameworkElementFactory comboBoxFactory = new FrameworkElementFactory（typeof（ComboBox））; 
 comboBoxFactory.SetValue（Border.BorderBrushProperty，Brushes.Red）; 
 
 ControlTemplate ct = new ControlTemplate（typeof（Combobox））; 
 ct.VisualTree = comboBoxFactory; 
 MyComboBox.Template = ct; 
  




I have a ComboBox and I want to change the border's color to red to mark it as a mandatory field. I am generating this ComboBox column dynamically through my Code. What are the properties that I should set in order to change the border color?

  DataGridTemplateColumn dataGridComboBoxTemplateColumnObj = new DataGridTemplateColumn();
  dataGridComboBoxTemplateColumnObj.Header = column.Header;
  FrameworkElementFactory comboBoxFactory = new FrameworkElementFactory(typeof(ComboBox));
  Binding bindingItemSourceObj = new Binding(column.ItemsSourcePropertyName);
  comboBoxFactory.SetValue(ComboBox.HorizontalAlignmentProperty, HorizontalAlignment.Stretch);
  comboBoxFactory.SetValue(ComboBox.ItemsSourceProperty, bindingItemSourceObj);              
  comboBoxFactory.SetValue(ComboBox.SelectedValuePathProperty, column.ValuePropertyName);

  Binding selectedValueBindingObj = new Binding(column.PropertyName);
  selectedValueBindingObj.Mode = BindingMode.TwoWay;
  selectedValueBindingObj.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
  comboBoxFactory.SetValue(ComboBox.SelectedValueProperty, selectedValueBindingObj);
  dataGridComboBoxTemplateColumnObj.CellTemplate = new DataTemplate();
  dataGridComboBoxTemplateColumnObj.CellTemplate.VisualTree = comboBoxFactory;
  dataGridColumnObj = dataGridComboBoxTemplateColumnObj;

解决方案

If you have a ComboBox:

<ComboBox x:Name="MyComboBox"/>

You can just set the value of Border.BorderBrushProperty:

MyComboBox.SetValue(Border.BorderBrushProperty, Brushes.Red);

In this way you change exactly the border color of the ComboBox to red.

Edit: I added this example for your specific FrameworkElementFactory:

FrameworkElementFactory comboBoxFactory = new FrameworkElementFactory(typeof(ComboBox));
comboBoxFactory.SetValue(Border.BorderBrushProperty, Brushes.Red);

ControlTemplate ct = new ControlTemplate(typeof(ComboBox));
ct.VisualTree = comboBoxFactory;
MyComboBox.Template = ct;

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