如何比较两个富文本框内容并突出显示更改的字符? [英] How to compare two rich text box contents and highlight the characters that are changed?

问题描述

我用来读取2个richtextbox内容的代码如下:

richTextBox1.Text = File.ReadAllText(tfsVersionFilePath);richTextBox2.Text = File.ReadAllText(dbVersionFilePath);

现在，我需要比较两个富文本框的内容并突出显示两个富文本框中更改的字符.目的是通过c#应用程序获取差异并突出显示字符as in TFS(比较文件).谢谢.

int length = (richTextBox1.Text.Length >richTextBox2.Text.Length) ?richTextBox1.Text.Length : richTextBox2.Text.Length;for (int i = 0; i < length; i++){if (richTextBox1.Text[i] !=richTextBox2.Text[i]){/* 然后在这里开始你的高光选择，这就是两个富人之间的一些区别文本框开始 */richTextBox1.Select(i, 1);richTextBox1.SelectionColor = System.Drawing.Color.Yellow;richTextBox1.SelectionBackColor = System.Drawing.Color.Red;}}

我从调试中了解到，richTextBox1指向文本光标的Select或SelectionColor或SelectionBackColor方法增加到7执行特定行之后的位置.如何保持richTextBox1的光标位置?

解决方案

首先感谢 ArtyomZzz 指出 DiffMatchPatch 的重要来源！

这是一段代码，当单击按钮时，它将在两个 RichTextboxes 中绘制更改的字符.

首先下载 应该会有所帮助..

Code that I used for reading the 2 richtextbox contents are as follows:

richTextBox1.Text = File.ReadAllText(tfsVersionFilePath);
richTextBox2.Text = File.ReadAllText(dbVersionFilePath);

Now, I need to compare the two rich text box contents and highlight the characters that are changed in both richtextboxes. Purpose is to get the difference and highlight the characters as in TFS(comparing files) through c# application. Thanks.

Edit:

int length = (richTextBox1.Text.Length > richTextBox2.Text.Length) ? richTextBox1.Text.Length : richTextBox2.Text.Length;
for (int i = 0; i < length; i++)
{ 
   if (richTextBox1.Text[i] != richTextBox2.Text[i])
   {
      /* and then start your highlight selection here, 
      this is where some difference between the two rich 
      text boxes begins */

      richTextBox1.Select(i, 1); 
      richTextBox1.SelectionColor = System.Drawing.Color.Yellow; 
      richTextBox1.SelectionBackColor = System.Drawing.Color.Red;
   }
}

What I understood from debugging is that the Select or SelectionColor or SelectionBackColor method of richTextBox1 pointing the text cursor increased to 7 positions after the particular lines executed. How to maintain the cursor position of richTextBox1 ?

解决方案

First kudos to ArtyomZzz for pointing to the great source of DiffMatchPatch!

Here is a piece of code the will paint the changed characters in two RichTextboxes upon a button click.

First download the diff-match-patchsource. (!See update below!) From the zip file copy 'DiffMatchPatch.cs' and also 'COPY' to your project and inlude the cs file in you project. Also add the namespace to your using clauses.

using DiffMatchPatch;

namespace RTF_diff
{
  public partial class Form1 : Form
  {
    public Form1()
    {
        InitializeComponent();
    }

    // this is the diff object;
    diff_match_patch DIFF = new diff_match_patch();

    // these are the diffs
    List<Diff> diffs;

    // chunks for formatting the two RTBs:
    List<Chunk> chunklist1; 
    List<Chunk> chunklist2;

    // two color lists:
    Color[] colors1 = new Color[3] { Color.LightGreen, Color.LightSalmon, Color.White };
    Color[] colors2 = new Color[3] { Color.LightSalmon, Color.LightGreen, Color.White };


    public struct Chunk
    {
        public int startpos;
        public int length;
        public Color BackColor;
    }


    private void button1_Click(object sender, EventArgs e)
    {
        diffs = DIFF.diff_main(RTB1.Text, RTB2.Text);
        DIFF.diff_cleanupSemanticLossless(diffs);      // <--- see note !

        chunklist1 = collectChunks(RTB1);
        chunklist2 = collectChunks(RTB2);

        paintChunks(RTB1, chunklist1);
        paintChunks(RTB2, chunklist2);

        RTB1.SelectionLength = 0;
        RTB2.SelectionLength = 0;
    }


    List<Chunk> collectChunks(RichTextBox RTB)
    {
        RTB.Text = "";
        List<Chunk> chunkList = new List<Chunk>();
        foreach (Diff d in diffs)
        {
            if (RTB == RTB2 && d.operation == Operation.DELETE) continue;  // **
            if (RTB == RTB1 && d.operation == Operation.INSERT) continue;  // **

            Chunk ch = new Chunk();
            int length = RTB.TextLength;
            RTB.AppendText(d.text);
            ch.startpos = length;
            ch.length = d.text.Length;
            ch.BackColor = RTB == RTB1 ? colors1[(int)d.operation]
                                       : colors2[(int)d.operation];
            chunkList.Add(ch);
        }
        return chunkList;

    }

    void paintChunks(RichTextBox RTB, List<Chunk> theChunks)
    {
        foreach (Chunk ch in theChunks)
        {
            RTB.Select(ch.startpos, ch.length);
            RTB.SelectionBackColor = ch.BackColor;
        }

    }

  }
}

At first I was trying to also color the changed lines as a whole in a lighter color; however that takes considerably more work, can't be done (coloring the whole line as opposed to just the part with content), and was not part of your question in the first place..

Note: There are four different post-diff cleanup methods. Which is best suited will depend on the input and purpose. I suggest trying the cleanupSemanticLossless. I have added a 3rd screenshot showing how this cleanup works

Here is a screenshot of the output:

And one of the new version:

Screenshot after cleanupSemanticLossless:

Update: The sources seem to have moved. This should help..

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