在 C# WPF 中以编程方式进行基本 ComboBoxItem 绑定

Question

我正在尝试以编程方式更改 ComboBoxItem 模板

//Main Style
Style style = new Style() { TargetType = typeof(ComboBoxItem) };
//Set Template
ControlTemplate temp = new ControlTemplate(typeof(ComboBoxItem));
style.Setters.Add(new Setter() { Property = Control.TemplateProperty, Value = temp });

//Item Border
FrameworkElementFactory itemB = new FrameworkElementFactory(typeof(Border));
itemB.SetValue(Border.BorderBrushProperty, Brushes.Red);
itemB.SetValue(Border.WidthProperty, (double)500);
itemB.SetValue(Border.HeightProperty, (double)30);
itemB.SetValue(Border.BorderThicknessProperty, new Thickness(2));
itemB.SetValue(Border.BackgroundProperty, Brushes.GreenYellow);
temp1.VisualTree = itemB;

//Item Label
FrameworkElementFactory itemT = new FrameworkElementFactory(typeof(Label));
itemT.AppendChild(itemB);
itemT.SetValue(Label.ForegroundProperty, Brushes.Red);

/* This Part Is Not Working*/
itemT.SetBinding(Label.ContentProperty, new Binding { RelativeSource = RelativeSource.Self });
        
//Set Template
Application.Current.Resources[typeof(ComboBoxItem)] = style;

我也尝试过这个

itemT.SetBinding(Label.ContentProperty, new Binding { Source = ComboBoxItem.ContentProperty });

问题是项目名称未显示在下拉列表中。

这就是我添加组合框的方式

//ComboBox
ComboBox combobox = new ComboBox() {Height = 30, Width = 500};
combobox.Items.Add("OK 1");
combobox.Items.Add("OK 2");
combobox.Items.Add("OK 3");
combobox.Items.Add("OK 4");

这是我的下拉列表的样子

Answer 1

除此之外，还不清楚为什么您不简单地在 XAML 中执行此操作

itemT.SetBinding(Label.ContentProperty,
    new Binding { RelativeSource = RelativeSource.Self });

和

itemT.SetBinding(Label.ContentProperty,
    new Binding { Source = ComboBoxItem.ContentProperty });

错了。

在 ControlTemplate 中，您将绑定到 模板化父元素：

itemT.SetBinding(Label.ContentProperty,
    new Binding { RelativeSource = RelativeSource.TemplatedParent });