WPF里给RichTextBox中的文本添加行号

     这是一个简单的DEMO，关键是DEMO添加行的思路，首先给RichTextBox添加6行文本，然后点击添加行按钮后，将每行文本取出，添加行号，最后将添加完行号的内容重新填充进RichTextBox里。

第一步：新建一个WPF应用程序

第二步:界面代码：

<Window x:Class="WpfApplication4.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"   Topmost="True">
    <Grid Name="grid">
        <RichTextBox Name="rtb"  AcceptsReturn="True" Width="200" Height="200" AcceptsTab="True" VerticalScrollBarVisibility="Auto"/>
        <Button Name="btn" Margin="371,228,46,55" Content="添加行号" Click="btn_Click"></Button>
    </Grid>
</Window>

第三步：后台代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication4
{
    ///<summary>
    /// MainWindow.xaml 的交互逻辑
    ///</summary>
publicpartialclass MainWindow : Window
    {
       
        public MainWindow()
        {
            InitializeComponent();
            //添加文本
            FlowDocument flowDoc =new FlowDocument();
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 1")));
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 2")));
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 3")));
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 4")));
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 5")));
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 6")));
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 7")));
            flowDoc.Blocks.Add(new Paragraph(new Run("Line 8")));
            rtb.Document = flowDoc;
         
        }

        privatevoid btn_Click(object sender, RoutedEventArgs e)
        {
            List<Paragraph> list =new List<Paragraph>();
            List<Block> bc = rtb.Document.Blocks.ToList();
            int i =1;
            for (int j =0; j < bc.Count; j++)
            {
             
                Paragraph p = bc[j] as Paragraph;
                Run r =new Run();
                foreach (Inline item1 in p.Inlines)
                {
                    r.Text = i +" : "+ ((Run)item1).Text; //给每行文本加上行号
                }
                p.Inlines.Clear();
                p.Inlines.Add(r);
                list.Add(p);
                i++;
            }

            FlowDocument flowDoc1 =new FlowDocument();
            foreach (Paragraph item in list)
            {
                flowDoc1.Blocks.Add(item);
            }

            rtb.Document = flowDoc1;
            btn.Visibility = Visibility.Collapsed;
        }

    }
}