在 WPF 应用程序中集成帮助

Question

在 WPF 应用程序中集成本地（而非在线）帮助的可能方法有哪些？它更像是一本手册，但我想以某种方式整合它。

编辑：刚刚找到 http://wordtoxaml.codeplex.com，我会尝试一下。它将word文档转换为xaml，我可以在WPF中显示它。

编辑2：我找到了一个可行的解决方案：用word编写手册，另存为XPS，然后使用 https://web.archive.org/web/20111116005415/ http://www.umutluoglu.com/english/post/2008/12/20/Showing-XPS-Documents-with-DocumentViewer-Control-in-WPF.aspx

Answer 1

我们使用 RoboHelp 并生成 chm 文件，有时称为 HTML 帮助文件。 .NET Framework 的 Help 类具有您调用的方法 ShowHelp，传递 chm 文件和要显示的主题。您可以告诉它按主题标题、ID 等显示。我们使用主题标题进行显示，因此调用如下所示：

System.Windows.Forms.Help.ShowHelp(null, "Help/ExiaProcess.chm", HelpNavigator.Topic, helpTopic);

接下来，您可以创建一个名为 HelpProvider 的类，该类创建一个名为 HelpTopic 的附加属性。这允许您将 HelpTopic 属性附加到任何 FrameworkElement。该类还使用静态构造函数将内置 F1 帮助命令挂钩到命令处理程序，这些处理程序从源中检索附加属性并打开帮助。

using System.Windows;
using System.Windows.Forms;
using System.Windows.Input;

/// <summary>
/// Provider class for online help.  
/// </summary>
public class HelpProvider
{
    #region Fields

    /// <summary>
    /// Help topic dependency property. 
    /// </summary>
    /// <remarks>This property can be attached to an object such as a form or a textbox, and 
    /// can be retrieved when the user presses F1 and used to display context sensitive help.</remarks>
    public static readonly DependencyProperty HelpTopicProperty = 
        DependencyProperty.RegisterAttached("HelpTopic", typeof(string), typeof(HelpProvider));

    #endregion Fields

    #region Constructors

    /// <summary>
    /// Static constructor that adds a command binding to Application.Help, binding it to 
    /// the CanExecute and Executed methods of this class. 
    /// </summary>
    /// <remarks>With this in place, when the user presses F1 our help will be invoked.</remarks>
    static HelpProvider()
    {
        CommandManager.RegisterClassCommandBinding(
            typeof(FrameworkElement),
            new CommandBinding(
                ApplicationCommands.Help,
                new ExecutedRoutedEventHandler(ShowHelpExecuted),
                new CanExecuteRoutedEventHandler(ShowHelpCanExecute)));
    }

    #endregion Constructors

    #region Methods

    /// <summary>
    /// Getter for <see cref="HelpTopicProperty"/>. Get a help topic that's attached to an object. 
    /// </summary>
    /// <param name="obj">The object that the help topic is attached to.</param>
    /// <returns>The help topic.</returns>
    public static string GetHelpTopic(DependencyObject obj)
    {
        return (string)obj.GetValue(HelpTopicProperty);
    }

    /// <summary>
    /// Setter for <see cref="HelpTopicProperty"/>. Attach a help topic value to an object. 
    /// </summary>
    /// <param name="obj">The object to which to attach the help topic.</param>
    /// <param name="value">The value of the help topic.</param>
    public static void SetHelpTopic(DependencyObject obj, string value)
    {
        obj.SetValue(HelpTopicProperty, value);
    }

    /// <summary>
    /// Show help table of contents. 
    /// </summary>
    public static void ShowHelpTableOfContents()
    {
        System.Windows.Forms.Help.ShowHelp(null, "Help/ExiaProcess.chm", HelpNavigator.TableOfContents);
    }

    /// <summary>
    /// Show a help topic in the online CHM style help. 
    /// </summary>
    /// <param name="helpTopic">The help topic to show. This must match exactly with the name 
    /// of one of the help topic's .htm files, without the .htm extention and with spaces instead of underscores
    /// in the name. For instance, to display the help topic "This_is_my_topic.htm", pass the string "This is my topic".</param>
    /// <remarks>You can also pass in the help topic with the underscore replacement already done. You can also 
    /// add the .htm extension. 
    /// Certain characters other than spaces are replaced by underscores in RoboHelp help topic names. 
    /// This method does not yet account for all those replacements, so if you really need to find a help topic
    /// with one or more of those characters, do the underscore replacement before passing the topic.</remarks>
    public static void ShowHelpTopic(string helpTopic)
    {
        // Strip off trailing period.
        if (helpTopic.IndexOf(".") == helpTopic.Length - 1)
            helpTopic = helpTopic.Substring(0, helpTopic.Length - 1);

        helpTopic = helpTopic.Replace(" ", "_").Replace("\\", "_").Replace("/", "_").Replace(":", "_").Replace("*", "_").Replace("?", "_").Replace("\"", "_").Replace(">", "_").Replace("<", "_").Replace("|", "_") + (helpTopic.IndexOf(".htm") == -1 ? ".htm" : "");
        System.Windows.Forms.Help.ShowHelp(null, "Help/ExiaProcess.chm", HelpNavigator.Topic, helpTopic);
    }

    /// <summary>
    /// Whether the F1 help command can execute. 
    /// </summary>
    private static void ShowHelpCanExecute(object sender, CanExecuteRoutedEventArgs e)
    {
        FrameworkElement senderElement = sender as FrameworkElement;

        if (HelpProvider.GetHelpTopic(senderElement) != null)
            e.CanExecute = true;
    }

    /// <summary>
    /// Execute the F1 help command. 
    /// </summary>
    /// <remarks>Calls ShowHelpTopic to show the help topic attached to the framework element that's the 
    /// source of the call.</remarks>
    private static void ShowHelpExecuted(object sender, ExecutedRoutedEventArgs e)
    {
        ShowHelpTopic(HelpProvider.GetHelpTopic(sender as FrameworkElement));
    }

    #endregion Methods
}

完成此操作后，您可以通过如下代码调用帮助：

private void HelpButton_Click(object sender, RoutedEventArgs e)
{
    Help.HelpProvider.ShowHelpTopic("License Key Dialog");
}

更好的是，现在您可以将帮助附加到 UI 中的任何 FrameworkElement，如下所示，

<Window name="MainWin"
    ...
    ...
    xmlns:help="clr-namespace:ExiaProcess.UI.Help"
    ...
    ...
    help:HelpProvider.HelpTopic="Welcome to YourApp" />      
    ...
    ...
    <TextBox help:HelpProvider.HelpTopic="Bug Title" />
    ...
    ...
    <ComboBox help:HelpProvider.HelpTopic="User Drop Down"/>
    ...

现在，当用户在窗口或任何元素上按 F1 时，他们会得到上下文相关的帮助。

Answer 2

我有类似的需求，只不过我只需要将 F1 键连接到我们现有的帮助代码。

我最终混合了大约 5 个不同的 StackOverflow 页面，因此我将其放在这里，以防其他人有类似的需求。

在我的 MainWindow.xaml 中，我在 inputBindings 中添加了一个 KeyBinding，以将 F1 连接到 ICommand：

<Window.InputBindings>
    (other bindings here...)
    <KeyBinding Key="F1" Command="{Binding Path=ShowHelpCommand}"/>
</Window.InputBindings>

然后在我的 MainWindowViewModel.cs 中，我添加了这个 ICommand，它调用我现有的帮助代码。

    private ICommand _showHelpCommand;
    public ICommand ShowHelpCommand
    {
        get
        {
            return _showHelpCommand ??
                   (_showHelpCommand = new RelayCommand(p => DisplayCREHelp(), p => true));
        }
    }

我希望这对遇到类似问题的人有所帮助。