TX Text Control 是一款功能類似于 MS Word 的文字處理控件，包括文檔創建、編輯、打印、郵件合并、格式轉換、拆分合并、導入導出、批量生成等功能。廣泛應用于企業文檔管理，網站內容發布，電子病歷中病案模板創建、病歷書寫、修改歷史、連續打印、病案歸檔等功能的實現。

在文檔處理應用程序中比較文檔的策略有很多。最常見的方法之一是逐字比較文檔的文本。這是一種簡單有效的文檔比較方法，但它確實有一些局限性。

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逐字比較

本質上，該比較算法按給定順序比較所有段落。在段落的基礎上，將按照分隔符提取所有句子。最后，將原始文檔中這些句子中的單詞與給定的修訂文檔進行比較。

結果在原始文檔中標記為跟蹤更改。跟蹤更改在原始文檔中突出顯示，用戶可以看到對文檔所做的更改。

執行

 該示例實現了該類DocumentComparison，該類接受兩個TXText控件。 其構造函數中的文本控件實例。您可以輕松地重寫此類以使用非 UI TXText控件。服務器文本控件實例。

DocumentComparison dc = new DocumentComparison(textControl1, textControl2);

構造函數比較兩個文檔。它循環遍歷原始文檔中的所有段落，并將文本與修訂后的文檔進行比較。如果發現差異，文本將被標記為跟蹤更改。

提取句子

該ExtractSentences方法從當前段落中獲取一個字符串，并通過在典型的分隔符處拆分它來返回句子列表。

public static List<string> ExtractSentences(string input)
{
List<string> sentences = new List<string>();

// Use regular expression to split the input string into sentences but keep white spaces
string pattern = @"([.!?])";

// split the input string into sentences with the delimiters
string[] splitSentences = Regex.Split(input, pattern);

// Trim each sentence and remove empty strings
foreach (string sentence in splitSentences)
{
sentences.Add(sentence);
}

return sentences;
}

比較句子

CompareSentences 方法創建單個單詞并比較每個給定句子中單詞的位置。它返回一個元組列表，每個元組包含三個元素：單詞 from sentence1、單詞開頭的字符索引以及對應的單詞 from sentence2。最后，它返回兩個句子之間的差異列表。

private static List<(string word, int charIndex, string replacedWord)> CompareSentences(string sentence1, string sentence2)
{
string[] words1 = sentence1.Split(' ');
string[] words2 = sentence2.Split(' ');

List<(string word, int charIndex, string replacedWord)> differences =
new List<(string word, int charIndex, string replacedWord)>();

// Track the character index
int charIndex = 0;

// Get the maximum length of the two sentences
int maxLength = Math.Max(words1.Length, words2.Length);

// Compare each word in the sentences
for (int i = 0; i < maxLength; i++)
{
// Check if the current word exists in both sentences
if (i < words1.Length && i < words2.Length)
{
// If the words are different, add the word, character index, and replaced word to the list
if (words1[i] != words2[i])
{
differences.Add((words1[i], charIndex, words2[i]));
}
}
// If one of the sentences is shorter, add the extra word to the list
else if (i < words1.Length)
{
differences.Add((words1[i], charIndex, ""));
}
else
{
differences.Add((words2[i], charIndex, ""));
}

// Update the character index for the next word
if (i < words1.Length)
charIndex += words1[i].Length + 1; // Add 1 for the space
}

return differences;
}

比較文件

DocumentComparison 類的構造函數使用上述方法來查找給定 TextControl 實例之間的差異。差異被標記為原始文檔中的跟蹤更改。

public DocumentComparison(TXTextControl.TextControl originalDocument, TextControl revisedDocument)
{
// Initialize document references
m_originalDocument = originalDocument;
m_revisedDocument = revisedDocument;

// Enable track changes in the original document
originalDocument.IsTrackChangesEnabled = true;

// Compare paragraphs between the original and revised documents
for (int p = 1; p <= m_originalDocument.Paragraphs.Count; p++)
{
var offsetSentences = 0;

// Retrieve the original and revised paragraphs
Paragraph originalParagraph = m_originalDocument.Paragraphs[p];

if (p > m_revisedDocument.Paragraphs.Count)
break; // Break if the revised document has fewer paragraphs than the original document

Paragraph revisedParagraph = m_revisedDocument.Paragraphs[p];

// Get the start position of the original paragraph
var startParagraph = originalParagraph.Start;
var uncheckedOffset = 0;

// Check if the text of the original and revised paragraphs differ
if (originalParagraph.Text != revisedParagraph.Text)
{
// Extract sentences from the original and revised paragraphs
var originalSentences = ExtractSentences(originalParagraph.Text);
var revisedSentences = ExtractSentences(revisedParagraph.Text);

// Compare sentences and replace words in the original document
for (int i = 0; i < originalSentences.Count; i++)
{
// Trim sentences and calculate offset
var originalTrimOffset = originalSentences[i].Length - originalSentences[i].Trim().Length;
var originalSentence = originalSentences[i].Trim();
var revisedSentence = revisedSentences[i].Trim();

// Track changes offset initialization
int trackedChangeOffset = 0;

var differences = CompareSentences(originalSentence, revisedSentence);

// Check if there are any differences
if (differences.Count == 0)
uncheckedOffset = originalSentences[i].Length - 1;

// Apply differences to the original document
foreach (var difference in differences)
{
m_originalDocument.Selection.Start = trackedChangeOffset + startParagraph + offsetSentences +
difference.charIndex + originalTrimOffset + uncheckedOffset - 1;

m_originalDocument.Selection.Length = difference.word.Length;
m_originalDocument.Selection.Text = difference.replacedWord;

trackedChangeOffset += difference.replacedWord.Length;
}

// Update offset for next sentence
offsetSentences += originalSentences[i].Length + trackedChangeOffset;
}
}

}
}

結論

逐字比較文檔是文檔比較的常用方法。此示例演示如何使用 TX Text Control 實現簡單的逐字比較算法。該示例比較兩個文檔并將差異標記為跟蹤原始文檔中的更改。

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