Question

我想将List中的String元素绑定到Textbox。当我单击一个元素时，文本会更新。但是当List中的元素更改时，文本框文本不会更改..

我的代码如下：

XAML：

   <TextBlock Foreground="White" Name="xTitel" Text="{Binding Titel}" Width="200"  FontSize="36" FontWeight="Bold"/>

OnClick功能：

        foreach (Channel c in App.Connector.ChannelList)
        {
            if (c.StationName == StationName)
            {

                Binding b = new Binding();
                b.Source = c.CurrentTitle;
                xTitel.SetBinding(TextBlock.TextProperty, b);
            }
        }

频道定义：

 public class GlobalVariables : INotifyPropertyChanged
{
    public static MediaElement mediaElement;
    private ObservableCollection<Channel> channelList;
    public ObservableCollection<Channel> ChannelList
    {
        get { return channelList; }
        set
        {
            channelList = value;
            NotifyPropertyChanged("ChannelList");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged(String propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (null != handler)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

修改

我忘了说：

在我的XAML中，我有一个GridView，它与Channellist Binding一起使用。如果我是正确的，每当我的Gridview更新时，Textbox都应该更新。这是我的Gridview：

<local:VariableGridView
            IsSwipeEnabled="True"
            Background="Transparent"
            x:Name="itemGridView"
            Margin="0,0,0,-3"
            Padding="116,0,40,46"
            SelectionMode="None"
            IsItemClickEnabled="True"
            ItemClick="ItemView_ItemClick" 
            Grid.RowSpan="2"

            >
            <local:VariableGridView.ItemsPanel>
                <ItemsPanelTemplate>
                    <VariableSizedWrapGrid Background="Transparent" Orientation="Vertical" ItemWidth="120" ItemHeight="120"/>
                </ItemsPanelTemplate>
            </local:VariableGridView.ItemsPanel>
            <local:VariableGridView.ItemTemplate>
                <DataTemplate>
                    <Grid Background="{Binding Background}">
                        <StackPanel Orientation="Horizontal" Margin="10,0,0,0">
                            <Image x:Name="CurrentCover" Source="{Binding CurrentCover}"  Width="90" Height="90"/>
                            <StackPanel Orientation="Vertical" HorizontalAlignment="Left" Margin="10,25,10,10">
                                <TextBlock Foreground="White" Text="{Binding Name}" Width="200"  FontSize="24" FontWeight="Bold"/>
                                <TextBlock Foreground="White" Text="{Binding CurrentArtist}" Width="200"  FontSize="12" FontWeight="Bold" />
                                <TextBlock Foreground="White" Text="{Binding CurrentTitle}" Width="200"  FontSize="12" />
                            </StackPanel>                            
                        </StackPanel>
                    </Grid>
                </DataTemplate>
            </local:VariableGridView.ItemTemplate>
        </local:VariableGridView>

Channel类：

 public class Channel : INotifyPropertyChanged
{

    public int Width { get; set; }
    public int Height { get; set; }
    public string Logo { get; set; }
    public string StationName { get; set; }
    public string Color { get; set; }
    public SolidColorBrush Background { get; set; }
    //public string Name { get; set; }
    private string name;
    public string Name
    {
        get { return name; }
        set
        {
            name = value;
           NotifyPropertyChanged("Name");
        }
    }

     //..... More Code ...
 }

（此Gridview中的文本框执行更新。但是其他文本框，我想在代码上设置绑定不会更新）

Answer 1

应该这样吗？

Binding b = new Binding("CurrentTitle");
b.Source = c;
xTitel.SetBinding(TextBlock.TextProperty, b);

编辑以解释一下：如果直接绑定到字符串属性，您将看不到更改，因为字符串是不可变的。它将永远设置在原始字符串上。您必须绑定到包含字符串属性的对象，并为绑定提供一个属性名称（路径）以监视更改。

将列表中的变量绑定到文本块INotifyPropertyChanged

1 个答案: