如何附加在代码后面创建的WPF控件的行为?

时间:2017-08-16 14:15:41

标签: c# wpf attachedbehaviors

我正在使用How can I make a WPF combo box have the width of its widest element in XAML?

中描述的ComboBox行为

与问题不同,我在后面的代码中创建了ComboBox(用于工具栏):

    private static ComboBox GetCombobox(ToolbarItemViewModel item)
    {
        var cmbBox = new ComboBox();
        cmbBox.Name = item.Name;
        item.CmbBoxItems = new ObservableCollection<KeyValuePair<string, string>>(NisDllInterface.GetComboBoxValues(NisDllInterface.MainFrameName, item.Name));
        Binding itemsBinding = new Binding("CmbBoxItems");
        itemsBinding.Source = item;
        cmbBox.SetBinding(ComboBox.ItemsSourceProperty, itemsBinding);
        cmbBox.DisplayMemberPath = "Value";

        Binding selItemBinding = new Binding("SelectedItem");
        selItemBinding.Source = item;
        cmbBox.SetBinding(ComboBox.SelectedItemProperty, selItemBinding);

        return cmbBox;
    }

通过在上面的方法中添加Loaded事件处理程序,我得到了一些示例:

        cmbBox.Loaded += (sender, args) =>
        {
            ComboBox comboBox = sender as ComboBox;
            Action action = () => { comboBox.SetWidthFromItems(); };
            comboBox.Dispatcher.BeginInvoke(action, DispatcherPriority.ContextIdle);
        };

但是我想知道如何在XAML中以相同的方式在代码中附加行为:

<ComboBox behaviors:ComboBoxWidthFromItemsBehavior.ComboBoxWidthFromItems="True">

1 个答案:

答案 0 :(得分:2)

必须有一个名为

的方法
ComboBoxWidthFromItemsBehavior.SetComboBoxWidthFromItems(c‌​ontrol, bool) 
您可以使用