如何获得C#中两个文件之间的差异

问题描述

我有两个文件A1.txt和A2.txt. A1.txt是A2.txt的早期版本，并且某些行已添加到A2.如何获得添加到A2的新行?

我只希望添加新行，而不想要A1中但在A2中删除的行.

请提出一种方法！

I have two files A1.txt and A2.txt. A1.txt is previous version of A2.txt and some lines have been added to A2. How can I get the new lines that are added to A2?

I just want the new lines added and dont want the lines which were in A1 but deleted in A2.

Please suggest a way to do this!

推荐答案

// required
using System.IO;
using System.Linq;

string originalPath = @""; // path to valid .txt File
string revisionPath = @""; // path to valid .txt File

private void SomeButton_Click(object sender, EventArgs e)
{
    string[] InRevisionNotInOriginal = LineDiff(originalPath, revisionPath).ToArray();

    string[] InOriginalNotInRevision = LineDiff(revisionPath, originalPath).ToArray();
}

public static IEnumerable<string> LineDiff(string originalPath, string revisionPath)
{
    if (File.Exists(originalPath) && File.Exists(revisionPath))
    {
        return File.ReadAllLines(revisionPath).Except(File.ReadAllLines(originalPath));
    }
    else
    {
        throw new FileNotFoundException("Bad File Path");
    }
}

当您要检测何时将source1中的元素移到了source2中的不同位置时，分析差异"就变得很有趣.并且，当您要检测重复值元素总数的变化时.

Where analyzing "difference" gets interesting is when you want to detect when an element in source1 has been moved to a different position in source2; and, when you want to detect changes in the total number of duplicate value elements.

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