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前言

使用WPF 中的RichTextBox控件实现添加文本后自动滚动末尾。因为RichTextBox无法直接绑定数据，所以通过引用System.Windows.Interactivity实现（System.Windows.Interactivity.WPF）

代码

MainWindow.xaml

<Window x:Class="WPF_MvvmDemo.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:behavior="clr-namespace:WPF_MvvmDemo" xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800"><Grid><Grid.RowDefinitions><RowDefinition Height="*"/><RowDefinition Height="50"/></Grid.RowDefinitions><RichTextBox Name="OutputListBox" Grid.Row="0"  Margin="5" Background="#FFFFFF" Focusable="True" VerticalScrollBarVisibility="Auto"><!--数据绑定--><i:Interaction.Behaviors><behavior:RichTextBoxBehavior Document="{Binding RichTextContent, Mode=TwoWay}" /></i:Interaction.Behaviors><!--自动滚动--><i:Interaction.Triggers><i:EventTrigger EventName="TextChanged"><ei:CallMethodAction MethodName="ScrollToEnd" /></i:EventTrigger></i:Interaction.Triggers></RichTextBox><Button  Grid.Row="2" Width="150" Margin="5" HorizontalAlignment="Right"Command="{Binding AppendTextCommand}">AddText</Button></Grid>
</Window>

MainWindow

public partial class MainWindow : Window
{MainViewModel viewModel;public MainWindow(){InitializeComponent();viewModel=new MainViewModel();this.DataContext = viewModel;}
}

RelayCommand

public class RelayCommand : ICommand
{public Action<string> execute;public RelayCommand(Action<string> execute){this.execute = execute;}public event EventHandler? CanExecuteChanged;public bool CanExecute(object? parameter){return CanExecuteChanged!=null;}public void Execute(object? parameter){execute?.Invoke(parameter?.ToString());}
}

RichTextBoxBehavior

/// <summary>
///RichTextBox 的 Document 属性不是一个依赖属性（DependencyProperty），因此不能直接进行双向数据绑定。
///我们需要使用一种间接的方式来实现数据绑定。
///解决方案:
///使用 Behavior 来实现 RichTextBox 的数据绑定。Behavior 是一个附加行为，可以在 XAML 中使用，
///通过代码来实现复杂的行为逻辑。
/// </summary>
public class RichTextBoxBehavior : Behavior<RichTextBox>
{public static readonly DependencyProperty DocumentProperty =DependencyProperty.Register("Document", typeof(FlowDocument), typeof(RichTextBoxBehavior),new FrameworkPropertyMetadata(null, OnDocumentChanged));public FlowDocument Document{get { return (FlowDocument)GetValue(DocumentProperty); }set { SetValue(DocumentProperty, value); }}private static void OnDocumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e){var behavior = d as RichTextBoxBehavior;if (behavior != null){behavior.UpdateRichTextBox((FlowDocument)e.NewValue);}}protected override void OnAttached(){base.OnAttached();AssociatedObject.Loaded += OnLoaded;AssociatedObject.TextChanged += OnTextChanged;}protected override void OnDetaching(){base.OnDetaching();AssociatedObject.Loaded -= OnLoaded;AssociatedObject.TextChanged -= OnTextChanged;}private void OnLoaded(object sender, RoutedEventArgs e){UpdateRichTextBox(Document);}private void OnTextChanged(object sender, TextChangedEventArgs e){Document = AssociatedObject.Document;}private void UpdateRichTextBox(FlowDocument document){if (document != null && AssociatedObject.Document != document){AssociatedObject.Document = document;}}
}