WPF页面导航

Question

我在WPF应用程序中使用自定义文本块，当我在WPF Windows中使用它时，它工作得很好，但当我在WPF页面中使用它时，它会产生问题。当我点击自定义控件中的链接时，它会浏览链接并显示在浏览器中，但是WPF页面也会导航回另一个WPF页面(第一页)

namespace Dtwitter.Controls
{
public class TweetTextBlock : TextBlock
{
    public TweetTextBlock()
    {
    }
    #region Dependency properties
    public string TweetText
    {
        get { return (string)GetValue(TweetTextProperty); }
        set { SetValue(TweetTextProperty, value); }
    }
    // Using a DependencyProperty as the backing store for TweetText.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty TweetTextProperty =
        DependencyProperty.Register("TweetText", typeof(string), typeof(TweetTextBlock),
        new FrameworkPropertyMetadata(string.Empty, new PropertyChangedCallback(OnTweetTextChanged)));
    #endregion

    private static void OnTweetTextChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
    {
        string text = args.NewValue as string;
        if (!string.IsNullOrEmpty(text))
        {
            TweetTextBlock textblock = (TweetTextBlock)obj;
            textblock.Inlines.Clear();
            textblock.Inlines.Add(" ");
            string[] words = Regex.Split(text, @"([ (){}[]])");
            string possibleUserName = words[0].ToString();
            if ((possibleUserName.Length > 1) && (possibleUserName.Substring(1, 1) == "@"))
            {
                textblock = FormatName(textblock, possibleUserName);
                words.SetValue("", 0);
            }
            foreach (string word in words)
            {
                // clickable hyperlinks
                if (UrlShorteningService.IsUrl(word))
                {
                    try
                    {
                        Hyperlink link = new Hyperlink();
                        link.NavigateUri = new Uri(word);
                        link.Inlines.Add(word);
                        link.Click += new RoutedEventHandler(link_Click);
                        link.ToolTip = "Open link in the default browser";
                        textblock.Inlines.Add(link);
                    }
                    catch
                    {
                        //TODO:What are we catching here? Why? Log it?
                        textblock.Inlines.Add(word);
                    }
                }
                // clickable @name
                else if (word.StartsWith("@"))
                {
                    textblock = FormatName(textblock, word);
                }
                // clickable #hashtag
                else if (word.StartsWith("#"))
                {
                    string hashtag = String.Empty;
                    Match foundHashtag = Regex.Match(word, @"#(w+)(?<suffix>.*)");
                    if (foundHashtag.Success)
                    {
                        hashtag = foundHashtag.Groups[1].Captures[0].Value;
                        Hyperlink tag = new Hyperlink();
                        tag.Inlines.Add(hashtag);
                        string hashtagUrl = "http://search.twitter.com/search?q=%23{0}";
                        // The main application has access to the Settings class, where a
                        // user-defined hashtagUrl can be stored.  This hardcoded one that
                        // is used to set the NavigateUri is just a default behavior that
                        // will be used if the click event is not handled for some reason.
                        tag.NavigateUri = new Uri(String.Format(hashtagUrl, hashtag));
                        tag.ToolTip = "Show statuses that include this hashtag";
                        tag.Tag = hashtag;
                        tag.Click += new RoutedEventHandler(hashtag_Click);
                        textblock.Inlines.Add("#");
                        textblock.Inlines.Add(tag);
                        textblock.Inlines.Add(foundHashtag.Groups["suffix"].Captures[0].Value);
                    }
                }
                else
                {
                    textblock.Inlines.Add(word);
                }
            }
            textblock.Inlines.Add(" ");
        }
    }
    public static TweetTextBlock FormatName(TweetTextBlock textblock, string word)
    {
        string userName = String.Empty;
        string firstLetter = word.Substring(0, 1);
        Match foundUsername = Regex.Match(word, @"@(w+)(?<suffix>.*)");
        if (foundUsername.Success)
        {
            userName = foundUsername.Groups[1].Captures[0].Value;
            Hyperlink name = new Hyperlink();
            name.Inlines.Add(userName);
            name.NavigateUri = new Uri("http://twitter.com/" + userName);
            name.ToolTip = "View @" + userName + "'s recent tweets";
            name.Tag = userName;
            name.Click += new RoutedEventHandler(name_Click);
            if (firstLetter != "@")
                textblock.Inlines.Add(firstLetter);
            textblock.Inlines.Add("@");
            textblock.Inlines.Add(name);
            textblock.Inlines.Add(foundUsername.Groups["suffix"].Captures[0].Value);
        }
        return textblock;
    }

    static void link_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            System.Diagnostics.Process.Start(((Hyperlink)sender).NavigateUri.ToString());
        }
        catch
        {
            //TODO: Log specific URL that caused error
            MessageBox.Show("There was a problem launching the specified URL.", "Error", MessageBoxButton.OK, MessageBoxImage.Exclamation);
        }
    }
}

}

Answer 1

更改链接点击方法为

static void link_click(Object sender, RequestNavigateEventArgs e) {
    try {
        System.Diagnostics.Process.Start(e.Uri.ToString());
    } catch {
        //TODO: Log specific URL that caused error
        MessageBox.Show("There was a problem launching the specified URL.", "Error", MessageBoxButton.OK, MessageBoxImage.Exclamation);
    } finally {
       e.Handled = true;
    }
}

更改

link.Click+=new RoutedEventHandler(link_Click);

link.RequestNavigate+=new RequestNavigateEventHandler(link_Click);

在link_click中设置e.Handled=true来标记你已经处理了链接点击，以防止框架进一步处理你的链接点击。

或者你可以把Hyperlink的TargetName属性设置为"_blank"而不需要进程启动命令

Answer 2

下面的代码应该使它在两种情况下(Page和Window)都以相同的方式工作....

尝试在web浏览器中按下鼠标打开超链接对象的超链接。

    Process.Start((e.OriginalSource as Hyperlink).NavigateUri.ToString());
    e.Handled  = true;

如果有帮助请告诉我