WPF DataGridColumn DisplayMemeberBinding答案

【问题标题】：WPF DataGridColumn DisplayMemeberBindingWPF DataGridColumn DisplayMemeberBinding
【发布时间】：2017-12-29 16:06:33
【问题描述】：

我有这个ListView 排序程序：

    /// <summary>
    /// Handle the event of clicking on a column header to sort
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void GridViewColumnHeaderClicked(object sender, RoutedEventArgs e)
    {
        GridViewColumnHeader headerClicked = e.OriginalSource as GridViewColumnHeader;

        if (headerClicked == null)
            return;

        if (headerClicked.Role == GridViewColumnHeaderRole.Padding)
            return;

>>>     var sortingColumn = (headerClicked.Column.DisplayMemberBinding as Binding)?.Path?.Path;
        if (sortingColumn == null)
            return;

        var direction = ApplySort(Items, sortingColumn);

        if (direction == ListSortDirection.Ascending)
        {
            headerClicked.Column.HeaderTemplate =
                Resources["HeaderTemplateArrowUp"] as DataTemplate;
        }
        else
        {
            headerClicked.Column.HeaderTemplate =
                Resources["HeaderTemplateArrowDown"] as DataTemplate;
        }

        // Remove arrow from previously sorted header
        if (_lastHeaderClicked != null && _lastHeaderClicked != headerClicked)
        {
            _lastHeaderClicked.Column.HeaderTemplate =
                Resources["HeaderTemplateDefault"] as DataTemplate;
        }

        _lastHeaderClicked = headerClicked;
    }

当使用DisplayMemberBinding 定义ListView.View 时，它运行良好，如下所示：

    <!-- Name -->
    <GridViewColumn Width="200" 
                    DisplayMemberBinding="{Binding FullName}">
        <GridViewColumn.Header>
        <GridViewColumnHeader Content=" Name"
                              HorizontalContentAlignment="Left" />
        </GridViewColumn.Header>
    </GridViewColumn>

我现在需要使一些列右对齐，所以我必须使用这样的东西：

<!-- Name -->
<GridViewColumn Width="200">
    <GridViewColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding FullName}"
                       TextAlignment="Right" />
            </DataTemplate>
    </GridViewColumn.CellTemplate>
    <GridViewColumn.Header>
    <GridViewColumnHeader Content=" Name"
                          HorizontalContentAlignment="Left" />
    </GridViewColumn.Header>
</GridViewColumn>

但是，我现在不再有 DisplayMemberBinding 可用于排序过程（标有 >>> 的行）。有没有办法从CellTemplate -> TextBlock 找到绑定？我一直在使用 Snoop 挖掘 C# 代码和 XAML 代码，但找不到绑定。

【问题讨论】：

我的第一个想法没有奏效，所以我充实了附加属性的想法。

标签： c# wpf xaml listview gridviewcolumn

【解决方案1】：

我会亲自写一个附加属性：

public static class GridViewExt
{
    #region GridViewExt.SortColumnPath Attached Property
    public static String GetSortColumnPath(GridViewColumn obj)
    {
        return (String)obj.GetValue(SortColumnPathProperty);
    }

    public static void SetSortColumnPath(GridViewColumn obj, String value)
    {
        obj.SetValue(SortColumnPathProperty, value);
    }

    public static readonly DependencyProperty SortColumnPathProperty =
        DependencyProperty.RegisterAttached("SortColumnPath", typeof(String), typeof(GridViewExt),
            new PropertyMetadata(null, SortColumnPath_PropertyChanged));

    private static void SortColumnPath_PropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var target = d as GridViewColumn;
    }
    #endregion GridViewExt.SortColumnPath Attached Property
}

用法：

private void GridViewColumnHeaderClicked(object sender, RoutedEventArgs e)
{
    GridViewColumnHeader headerClicked = e.OriginalSource as GridViewColumnHeader;

    if (headerClicked == null)
        return;

    if (headerClicked.Role == GridViewColumnHeaderRole.Padding)
        return;

    //  ...if DisplayMemberPath is null...
    var sortingColumn = GridViewExt.GetSortColumnPath(headerClicked.Column);

    if (sortingColumn == null)
        return;

XAML：

<GridViewColumn 
    Width="200"
    local:GridViewExt.SortColumnPath="FullName"
    >
    <GridViewColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding FullName}"
                       TextAlignment="Right" />
            </DataTemplate>
    </GridViewColumn.CellTemplate>

我的想法是您可以同时使用DisplayMemberBinding 和CellTemplate，但如果使用DisplayMemberBinding，CellTemplate 将被忽略。

【讨论】：