Question

我在Windows Phone 8项目中遇到DataContext问题。当我运行项目并且MainPage（）完成时 - 我看到第一个GIF，但是当我去Button_Click_1时 - 第一个GIF仍然可见。我不知道DataContext是如何工作的。有没有办法再次设置DataContext并显示第二个GIF？

namespace PhoneApp1
{
    public partial class MainPage : PhoneApplicationPage
    {

        public Uri ImageSource { get; set; }
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            ImageTools.IO.Decoders.AddDecoder<GifDecoder>();
            ImageSource = new Uri("http://c.wrzuta.pl/wi7505/bcd026ca001736004fc76975/szczur-piwo-gif-gif", UriKind.Absolute);
            this.DataContext = this;
        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {

            ImageSource = new Uri("http://0-media-cdn.foolz.us/ffuuka/board/wsg/image/1338/94/1338947099997.gif", UriKind.Absolute);
            this.DataContext = this;
        }


    }
}

XAML

<imagetools:AnimatedImage x:Name="Image" Source="{Binding ImageSource, Converter={StaticResource ImageConverter}}" Margin="43,0,50,257" />

Answer 1

您需要实施INotifyPropertyChanged，以便Xaml知道ImageSource属性的更改。

示例：

public partial class MainPage : PhoneApplicationPage, INotifyPropertyChanged
{
    private Uri _imageSource;
    public Uri ImageSource
    {
        get { return _imageSource; }
        set { _imageSource = value; NotifyPropertyChanged("ImageSource"); }
    }

    // Constructor
    public MainPage()
    {
        InitializeComponent();
        ImageTools.IO.Decoders.AddDecoder<GifDecoder>();
        this.DataContext = this;
        ImageSource = new Uri("http://c.wrzuta.pl/wi7505/bcd026ca001736004fc76975/szczur-piwo-gif-gif", UriKind.Absolute);
    }

    private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        ImageSource = new Uri("http://0-media-cdn.foolz.us/ffuuka/board/wsg/image/1338/94/1338947099997.gif", UriKind.Absolute);
    }

    public event PropertyChangedEventHandler PropertyChanged;
    /// <summary>
    /// Notifies the property changed.
    /// </summary>
    /// <param name="property">The property.</param>
    private void NotifyPropertyChanged(string property)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }
}

Windows Phone 8上的ImageTools，更改了ImageSource和DataContext

1 个答案: