Question

我正在开发一种商店或其他东西，我在其中阅读RSS Feed并在ListBox中显示其内容。 RSS源包含我使用（或想要使用）对ListBox的结果进行排序的其他数据（例如“download”或“customCategory”）。 ListBox看起来像这样：

<ListBox  Grid.Column="2" HorizontalAlignment="Stretch" Name="ItemsListParent" VerticalAlignment="Stretch" Margin="0,25,0,0">
            <ItemsControl Name="ItemsList" ItemsSource="{Binding Source={StaticResource rssData}}">
            <ItemsControl.ItemTemplate>
                <DataTemplate> 
                    <StackPanel Name="itemElement" Orientation="Horizontal" Loaded="itemElement_Loaded">
                        <StackPanel.Background>
                            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                <GradientStop Color="White" Offset="0.15" />
                                <GradientStop Color="LightGray" Offset="0.85" />
                                <GradientStop Color="White" Offset="1" />
                            </LinearGradientBrush>
                        </StackPanel.Background>

                        <!--<Image Width="15" Margin="2" Source="{Binding XPath=url, Path=InnerText}"/>-->
                        <!--<TextBlock Margin="2" FontSize="16" VerticalAlignment="Center" Text="{Binding XPath=title}" FontWeight="Normal">
                            <Hyperlink Name="lnkGoToArticle" Tag="{Binding XPath=link, Path=InnerText}" Click="lnkGoToArticle_Click">
                                >>
                            </Hyperlink>
                            <Button Name="lnkDownload" Tag="{Binding XPath=download, Path=InnerText}" Style="{DynamicResource NoChromeButton}" Click="lnkDownload_Click">
                                <Image Source="Images/download31.png" Name="DownloadIcon" Width="30" Height="30" />
                            </Button>
                        </TextBlock>-->
                    </StackPanel>

                </DataTemplate>
            </ItemsControl.ItemTemplate>
            </ItemsControl>
        </ListBox>

中的代码

<!-- -->

是我重写为C＃的内容，因为我认为我可以弄清楚如何对XML进行排序。关键是，我已经创建了

void UpdateListBox()
    {
        ItemsList.Items.Clear();

        selected = (string)CategoriesList.SelectedItem;
        //if (selected==xmldp

        /*System.Xml.XmlDocument data = new System.Xml.XmlDocument();
        data.Load(@"http://www.andystore.bluefile.cz/?feed=rss2");
        xmldp.Document = data;
        xmldp.XPath = "//item";*/


        Thickness mrg = new Thickness();
        mrg.Left = 2;
        mrg.Right = 2;
        mrg.Top = 2;
        mrg.Bottom = 2;
        TextBlock itemTitle=new TextBlock();
        itemTitle.Margin=mrg;
        itemTitle.FontSize=16;
        itemTitle.VerticalAlignment = VerticalAlignment.Center;
        itemTitle.Text = "{Binding XPath=title}";
        itemTitle.FontWeight = FontWeights.Normal;
        itemTitle.Name="itemTitle";
        Binding itemTitleBinding=new Binding();
        itemTitleBinding.XPath="title";
        itemTitle.SetBinding(TextBlock.TextProperty,itemTitleBinding);

        itemElement.Children.Add(itemTitle);
        itemElement.RegisterName(itemTitle.Name, itemTitle);

        Label gta = new Label();
        Hyperlink goToArticle = new Hyperlink();
        goToArticle.Click += new RoutedEventHandler(lnkGoToArticle_Click);
        goToArticle.Inlines.Add(@">>");
        Binding goToArticleBinding = new Binding();
        goToArticleBinding.Path = new PropertyPath("InnerText");
        goToArticleBinding.XPath = "link";
        goToArticle.SetBinding(Hyperlink.TagProperty, goToArticleBinding);
        gta.Content = goToArticle;

        itemElement.Children.Add(gta);
        itemElement.RegisterName(goToArticle.Name, goToArticle);

        Button downloadButton = new Button();
        downloadButton.Name = "lnkDownload";
        downloadButton.Cursor = Cursors.Hand;
        downloadButton.Click += new RoutedEventHandler(lnkDownload_Click);
        Binding downloadButtonBinding = new Binding();
        downloadButtonBinding.XPath = "download";
        downloadButtonBinding.Path = new PropertyPath("InnerText");
        downloadButton.SetBinding(Button.TagProperty, downloadButtonBinding);
        Style downloadButtonStyle = this.FindResource("NoChromeButton") as Style;
        downloadButton.Style = downloadButtonStyle;
        BitmapImage dbiBitmap = new BitmapImage();
        dbiBitmap.BeginInit();
        dbiBitmap.UriSource = new Uri("pack://application:,,,/AndyLaunchWPF;component/Images/download31.png");
        dbiBitmap.EndInit();
        Image dbi = new Image();
        dbi.Width = 30;
        dbi.Height = 30;
        dbi.Name = "downloadIcon";
        dbi.Source = dbiBitmap;
        downloadButton.Content = dbi;

        itemElement.Children.Add(downloadButton);
        itemElement.RegisterName(downloadButton.Name, downloadButton);

        //itemElement.Children.Add(dbi);
        //itemElement.RegisterName(dbi.Name, dbi);
    }

但它完成整个列表框（如前所述在wpf代码中）而不重复调用!! 我想添加一些条件进行排序，例如if（xmldp.IDontKnowTheExactName == selectedCategory）{显示文本块} else {不显示它并转到XML中的下一项}但我真的不知道该怎么做。请耐心等待我，因为我是WPF的新手，这也是我的第一个问题。如果您没有真正得到我想要实现的目标，这里有一个简单的列表：

1）我想加载XML并在ItemsList

中显示它的所有项目

2）我想在ListBox中选择一个名为categoriesList的项目，并根据选择更新ItemsList来仅显示其customCategory ==选中的项目（选择的是一个将根据categoriesList选择更新的字符串）< / p>

问题是，我不知道在哪里放置条件，也不知道它应该是什么样子以及它是否可能。

希望你理解，你能帮助我。

感谢您的回答;）Andy

Answer 1

确定忘记通过代码构建视图，这不是WPF应该如何工作的。返回原始的xaml模板。

现在您遇到的问题是您要对ItemsControl中的项目进行排序和过滤。为此，您需要根据rssFeed将ItemsSource的{{1}}绑定到ItemsControl，而不是绑定到rssFeed本身。

CollectionView可让您轻松对集合进行排序和过滤。

顺便说一下，您的XAML中似乎有一个冗余的CollectionView。由于你在其中声明了ListBox，所以它没有做任何事情。 ItemsControl已经来自ListBox。如果您需要滚动条，请使用ItemsControl。

wpf基于xml数据显示文本块

1 个答案: