比较两个文本文件C＃时如何跳过缺失的行和多余的行

Question

I need to compare two txt files (file1 is used as baseline, and file2 is the one needs to compare with file1), I want to find out the differences to the file3, including missing lines, extra lines, and the lines with different content.

For my current code, if 2nd line in file2 is missing, all of following lines in file2 will be written into file3. How can skip the missing line in this case and only find out exactly different lines? Any ideas for this?

int file1LineNo = 0;
int file2LineNo = 0;
string file1lineStr;
string file2Str;
SortedDictionary<int, Object[]> info = new SortedDictionary<int, Object[]>();
string[] file1Lines = File.ReadAllLines(file1Name);
string[] file2Lines = File.ReadAllLines(file2Name);
while (file1LineNo<file1Lines.length)
{
  file1lineStr = file1Lines[file1LineNo];
  if (file1lineStr != null)
  {
    while(file2LineNo<file2Lines.Length)
    {
      file2Str = file2Lines[file2LineNo];
      if (file1LineNo == file2LineNo)
      {
         if(!file2Str.Trim().Equals(file1Str.Trim()))
         {
           Result = false;
           info.Add(rowNumber1++, new Object[]{"", file1lineStr, file2Str});
         }
      break;
      }
     file2LineNo++;
    }
   }
  }
 file1LineNo++;
}
foreach(var infoValue in info)
{
   Object[] objectArr = info.Value;
   for (int I=0; I<objectArr.Length; i++)
  {
    result.WriteResultToFile3(....);
   }
   rowed++;
}
 return Result;
}
}
}

Answer 1

This will output the difference in two files, outputting a diff file and a text file with the same content. You can further modify the output to your choosing using the git diff options. You will need the Git client installed on your machine or embed it in your source code using a NuGet package perhaps...

https://git-scm.com/downloads

using System;
using System.Collections.ObjectModel;
using System.Management.Automation;

namespace PowerShell_Export_Differences
{
class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Hello World!");
        string directory = "C:/PowershellTest";

        using (PowerShell powershell = PowerShell.Create())
        {
            powershell.AddScript(String.Format(@"cd {0}", directory));
            powershell.AddScript(@"git init");
            powershell.AddScript(@"git diff --no-index  Text1.txt Text2.txt > Text3.diff");
            powershell.AddScript(@"git diff --no-index  Text1.txt Text2.txt > Text3.txt");
            Collection <PSObject> results = powershell.Invoke();
            Console.Read();
        }
    }
}
}

Sample output:

Answer 2

Your question is a little inspecific and you really need to show some code.

Saying that if its basically "blank / empty" lines you have an issue with then try the following.

Remove all the "blank / empty" lines from both file 1 and file 2 then do the compare.

This to be honest its a bit "bodgy" but it may answer your question.

Show what you have already tried (code wise) and folk may be more willing to write something.

Answer 3

you have to read each line and store the lines in different string, then just compare. eg

string s1 = "first"; // store the line you have read from file1

string s2 = "second"; // store the line you have read from file2

if( !s1.Equals(s2) )

{

 // store the Result in file3 if there are not Equals.

}

NOTE: this code is working when the order of the lines are the same in the both files.