如何在後面的代碼中添加WPF行爲

Question

我試圖找到一種方法在代碼中添加行爲，我可以在XAML中成功添加它。

這是我如何將XAML中的行爲添加到網格中，SelectedItems是行爲中的DP，它是將數據綁定到視圖模型選定的項目屬性。我聽網收集改變的事件和更新DP這反過來通知所選項目

/// <summary> 
/// Dependency Property SelectedItems 
/// </summary> 
public static readonly DependencyProperty SelectedItemsProperty = 
     DependencyProperty.Register("SelectedItems", 
     typeof(INotifyCollectionChanged), typeof(MultiSelectBehavior), 
     new PropertyMetadata(null)); 

AssociatedObject.SelectedItems.CollectionChanged += GridSelectedItems_CollectionChanged; 

<i:Interaction.Behaviors>     
    <behaviors:MultiSelectBehavior SelectedItems="{Binding SelectedItems}"/> 
</i:Interaction.Behaviors> 

我需要的是背後在代碼中創建這種行爲的視圖模式。我在包含網格的窗口的構造函數中執行此操作，但它不起作用，viewmodel selected items屬性未得到更新。

var multiSelectBehavior = new MultiSelectBehaviorSingleton(); 
BindingOperations.SetBinding(this.BackupsGrid, MultiSelectBehavior.SelectedItemsProperty, 
    new Binding() 
    { 
     Source = this.DataContext, 
     Path = new PropertyPath("SelectedItems"), 
     Mode = BindingMode.OneWay 
    }); 
Interaction.GetBehaviors(this.BackupsGrid).Add(multiSelectBehavior); 

Answer 1

試試這個：

var multiSelectBehavior = new MultiSelectBehavior(); 
BindingOperations.SetBinding(multiSelectBehavior, MultiSelectBehavior.SelectedItemsProperty, new Binding("SelectedItems")); 
Interaction.GetBehaviors(this.BackupsGrid).Add(multiSelectBehavior);