//定义一个段落ParagraphParagraph paragraph = new Paragraph();//runRun run = new Run() { Text = "我是红色的Run", Background = new SolidColorBrush(Color.FromRgb(255, 0, 0)) };paragraph.Inlines.Add(run);//HyperlinkHyperlink hyperlink = new Hyperlink();hyperlink.Inlines.Add("我是博客园主页的链接");hyperlink.MouseLeftButtonDown += ((s, arg) =>{Process proc = new Process();proc.StartInfo.FileName = "http://www.cnblogs.com";proc.Start();});paragraph.Inlines.Add(hyperlink);//InlineUIContainerInlineUIContainer inlineUIContainer = new InlineUIContainer() { Child = new TextBlock() { Text = "我是的TextBlock，哈哈" } };paragraph.Inlines.Add(inlineUIContainer);rtb.Document.Blocks.Add(paragraph);//下面是BlockUIContainer部分Grid grid = new Grid();RowDefinition row1 = new RowDefinition();grid.RowDefinitions.Add(row1);RowDefinition row2 = new RowDefinition();grid.RowDefinitions.Add(row2);row2.Height = new GridLength(100);//定义图片，注意设置资源的类型，始终复制和嵌入Image image = new Image() { Source = new BitmapImage(new Uri(("Images/vs.png"), UriKind.Relative)) };image.Height = 30;image.SetValue(Grid.RowProperty, 0);grid.Children.Add(image);image.Visibility = Visibility.Visible;row2.SetBinding(RowDefinition.HeightProperty, new Binding("Height") { Source = image });//定义说明TextBlock block = new TextBlock();block.Text = "我是图片说明";block.SetValue(Grid.RowProperty, 1);grid.Children.Add(block);BlockUIContainer blockUIContainer = new BlockUIContainer(grid) ;rtb.Document.Blocks.Add(blockUIContainer);

Run:public Run(string text, TextPointer insertionPosition)Span：public Span(Inline childInline, TextPointer insertionPosition); 
public Span(TextPointer start, TextPointer end);Hypelink: 
public Hyperlink(Inline childInline, TextPointer insertionPosition); 
public Hyperlink(TextPointer start, TextPointer end); 
InlineContainer 
public InlineUIContainer(UIElement childUIElement, TextPointer insertionPosition); 

TextPointer textPointer = rtb.Selection.Start;Run run = new Run("测试", textPointer);

//获取选中部分的开始位置 
TextPointer textPointer = rtb.Selection.Start; 
//在开始位置插入内容 
Run run = new Run("测试", textPointer); 
//在插入内容的结尾到原来选中部分的结尾——原来选中部分的文字 清除掉 
TextPointer pointer = run.ContentEnd; 
TextRange textRange = new TextRange(pointer, rtb.Selection.End); 
textRange.Text = ""; 
//如果使用下面的会把刚刚插入的内容一并删除 
//rtb.Selection.Text = "";

<Grid> <Grid.RowDefinitions> <RowDefinition Height="1*"/> <RowDefinition Height="5*"/> </Grid.RowDefinitions> <ToolBarTray> <ToolBar> <Button Command="Undo">撤销</Button> <Button  Command="EditingCommands.ToggleBold" ToolTip="Bold">B</Button> </ToolBar> </ToolBarTray> <RichTextBox Name="rtb"  AcceptsTab="True" Grid.Row="1" Grid.ColumnSpan="4"></RichTextBox> <!--<Button x:Name="btnAddElement" Content="添加元素" Grid.Row="1" Click="btnAddElement_Click_1" Grid.Column="0" Margin="5"></Button>--></Grid>

<Style TargetType="{x:Type Button}" x:Key="ImageButtonStyle"> <Setter Property="CommandTarget" Value="{Binding ElementName=rtb}"></Setter> </Style>