来自itemtemplate的组合框项目集合操作 [英] Combobox Item collection manipulation from itemtemplate

问题描述

我有一个带有ItemTemplate的组合框:

I have a combobox with an ItemTemplate:

<combobox height="26" horizontalalignment="Left" margin="318,100,0,0" x:name="CriteriosOpcoesComboChecks" verticalalignment="Top" width="26" xmlns:x="#unknown">
    <combobox.itemtemplate>
        <datatemplate>
            <stackpanel orientation="Horizontal">
                <checkbox x:name="_SELECCIONADO" ischecked="{Binding SELECCIONADO, Mode=TwoWay}" checked="_SELECCIONADO_Checked" unchecked="_SELECCIONADO_Unchecked" />
                <textblock x:name="_CAMPO_ID" text="{Binding CAMPO_ID}" visibility="Collapsed" />
                <textblock x:name="_CAMPO_COMBO" text="{Binding CAMPO_COMBO}" />
            </stackpanel>
        </datatemplate>
    </combobox.itemtemplate>
</combobox>

在两个事件中("_SELECCIONADO_Checked"和"_SELECCIONADO_Unchecked")，我都需要操作Combox项集合.

In both events ("_SELECCIONADO_Checked" and "_SELECCIONADO_Unchecked") I need to manipulate the Combox Item collection.

private void _SELECCIONADO_Checked(object sender, RoutedEventArgs e)
        {
            CheckBox chAll = sender as CheckBox;
            List<app_get_group_by_campo_result> ItemList = new List<app_get_group_by_campo_result>();

            //Do something with the Combobox Item list.
        }</app_get_group_by_campo_result></app_get_group_by_campo_result>

>

我需要的帮助是如何以相对方式从CheckBox"chAll"开始，以相对方式将Combobox中的Item集合放入ItemList局部变量中.
我尝试使用:

The help I need is how to get the Item collection from the Combobox into the ItemList local variable in a relative manner starting on the CheckBox "chAll".

I tried to use:

DependencyObject t = sender as DependencyObject;
DependencyObject p = VisualTreeHelper.GetParent(t) as DependencyObject;

但是我被困在DataTemplate上，无法找到ComboBox的父级"方式.

任何人都可以提示如何工作吗?

谢谢

But I got stuck on the DataTemplate and couldn''t find a "parent" way up to the ComboBox.

Can anyone give a hint on how to get this working?

Thanks

推荐答案

我建​​议您阅读了解视觉效果WPF中的树和逻辑树 [ ^ ]了解逻辑树和可视树之间的区别.

但是，如果您在此处描述了不必要的情况，则可以执行

I would suggest you read Understanding the Visual Tree and Logical Tree in WPF[^] to understand the difference between the logical and visual tree.

But in the case you describe here that is not needed, you can just do

CriteriosOpcoesComboChecks.ItemsSource

这里是我的操作方式:

Here''s how I did it:

public object GetParentByType(string TypeOfParent, object ChildObject)
{
    string LocalTypeOfParent = "System.Windows.Controls." + TypeOfParent;
    DependencyObject SearchChildObject = ChildObject as DependencyObject;
    DependencyObject ComparingObject = VisualTreeHelper.GetParent(SearchChildObject) as DependencyObject;
    if (ComparingObject == null)
        ComparingObject = ((FrameworkElement)SearchChildObject).Parent as DependencyObject;
    if (ComparingObject.GetType().ToString() != LocalTypeOfParent)
        return GetParentByType(TypeOfParent, ComparingObject as object);
    else
        return ComparingObject as object;
}

并以这种方式使用.
我在最初的问题中描述了DataTemplate中CheckBox上的Checked Event Handler.

And use it this way.
I have the Checked Event Handler on the CheckBox in the DataTemplate described on my initial question.

        private void _SELECCIONADO_Checked(object sender, RoutedEventArgs e)
        {   // I know that I'm looking for a ComboBox and I have to be sure it's there

            ComboBox OQueProcuro = (ComboBox)GetParentByType("ComboBox", sender);

            //Do something with the found object.
//ToDo: Aditional code has to inserted for error handling in case that there is no object of the specified type as a parent of the current object.

        }

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