c# - Silverlight 更新绑定(bind)

Question

我有带有图像和文本 block 的项目模板。并将文本 block 绑定(bind)到 Name 属性。当我不尝试更新我的数据时，一切正常。当我在树中设置我的源节点新名称时，我看到旧名称。如何更新项目模板中的文本？

    <my:TreeView.ItemTemplate>
        <toolkit:HierarchicalDataTemplate ItemsSource="{Binding Children}">
            <StackPanel Orientation="Horizontal">
                <Image Source="{Binding Icon}"  Width="20" Height="20" />
                <TextBlock Text="{Binding Name}"   Height="20" TextAlignment="Center" HorizontalAlignment="Center" />
            </StackPanel>
        </toolkit:HierarchicalDataTemplate>
    </my:TreeView.ItemTemplate>

Answer 1

具有 Name 属性的类必须实现 System.ComponentModel.INotifyPropertyChanged 接口(interface)以通知 WPF UI 属性值已更改。类似于以下内容:

class MyClass : System.ComponentModel.INotifyPropertyChanged
{
    private String _name;
    public String Name
    {
        get { return _name; }
        set { _name = value; RaisePropertyChanged("Name"); }
    }

    public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
    protected void RaisePropertyChanged(String propertyName)
    {
        System.ComponentModel.PropertyChangedEventHandler temp = PropertyChanged;
        if (temp != null)
        {
            temp(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
        }
    }
}