从 WPF ListView 获取单元格容器

Question

我有一个组件的列表视图，该组件绑定到 BreakdownViewRow 类型的可观察集合。

每个单元格都包含一个在 EDIT 和 DISPLAY 模式下运行的组件。

我需要找到一种方法来以编程方式更改单元格内容的模式，但尝试迭代列表视图中的项目会返回 BreakdownViewRow 类型的对象。

有没有一种方法可以访问包含每个组件的单元格，而不是获取可观察集合中存在的项目？

我的组件的代码（ContainerSelected 事件绑定在 XAML 中，并正确触发传递 EditableControlContainer 对象作为发送者）：

public partial class ArrearsBreakdownView : UserControl
{
    private ObservableCollection<BreakdownViewRow> rows;

    public ObservableCollection<BreakdownViewRow> Rows {
        get { return rows; }
        set { rows = value; }
    }

    public BreakdownView() {
        InitializeComponent();
        rows = new ObservableCollection<BreakdownViewRow>();

        Populate();
        this.DataContext = this;
    }

    public void Populate() {
        rows.Add(new BreakdownViewRow(2015, 1000.50M, "TE1 \t Test Code 1", "This is a test row"));
        rows.Add(new BreakdownViewRow(2014, 100M, "TE1 \t Test Code 1", "Another row"));
        rows.Add(new BreakdownViewRow(2013, 150M, "TE1 \t Test Code 1", "This is a test row"));
    }

    public void ContainerSelected(object sender, RoutedEventArgs e) {
        EditableControlContainer ecc = (EditableControlContainer)sender;
        foreach (ListViewItem item in grdArrears.Items) {
            //Here, I get a BreakdownViewRow object, when what I need is the EditableControlContainer object,
            //or the cell container
        }
        int stop = 1;
    }
}

Answer 1

您可以尝试使用ItemContainerGenerator。它会返回该行的容器，但您可以使用TreeViewHelper 获取每个单元格的ContentPresenters，然后在每个ContentPresenter 的模板中查找您的控件：

public void ContainerSelected(object sender, RoutedEventArgs e) {
    EditableControlContainer ecc = (EditableControlContainer)sender;
    ItemContainerGenerator generator = grdArrears.ItemContainerGenerator;

    foreach (var item in grdArrears.Items) {
        var itemContainer = generator.ContainerFromItem(item);

        foreach (var presenter in GetChildrenOfType<ContentPresenter>(itemContainer))
        {
            var myControl = presenter.ContentTemplate.FindName("MyControl", presenter);
            // Do stuff with your cell control
        }
    }
}

private IEnumerable<T> GetChildrenOfType<T>(DependencyObject parent) where T : DependencyObject
{
    int childrenCount = VisualTreeHelper.GetChildrenCount(parent);

    for (int i = 0; i < childrenCount; i++)
    {
        var child = VisualTreeHelper.GetChild(parent, i);

        if (child is T)
            yield return (T)child;

        var childrenOfType = GetChildrenOfType<T>(child);

        foreach (var childOfType in childrenOfType)
            yield return childOfType;
    }
}