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Comparing files in VS 2013 - console application

Posted on 2014-03-04
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Last Modified: 2014-03-10
Hello EEE,

   I am trying this after a long while...created a new project in VS 2013 below. Now I need to read in two files from C:\logs. One is called All.txt, the other is called other.txt. Both have a listing of full paths for files under C:\logs\All and C:logs\Other.

I would like to compare both text files (just file names with the leading directories stripped) and find which ones are not in both.

How can I do that?


Module Module1

    Sub Main()

    End Sub

End Module
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Question by:LuckyLucks
  • 3
5 Comments
 
LVL 12

Expert Comment

by:jmcmunn
ID: 39904217
Psuedocode...

Open both files
   var line=ReadLineFromFile1
   while(not eof)
      add stripped file name to Firstlist<string>

   line = ReadLineFromFile2
   while(not eof)
      if stripped file is in list, remove from Firstlist
      else add to Secondlist<string>

Close both files
now, all of the files in Firstlist are in the first file, but not the second one
and, all of the files in Secondlist are in the second file, not the first

if you need help on any specific part of that, feel free to post here or ask a new question.  It is all very easily Googled.
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LVL 64

Expert Comment

by:Fernando Soto
ID: 39904294
Hi LuckyLucks;

The code snippet below should give you what you are looking for.

'Read all the file names and remove directory part and store in array
Dim allFiles As String() = File.ReadAllLines("C:\Working Directory\All.txt") _
                           .Select(Function(f) Path.GetFileName(f)).ToArray()

Dim OtherFiles As String() = File.ReadAllLines("C:\Working Directory\Other.txt") _
                             .Select(Function(f) Path.GetFileName(f)).ToArray()

' And array of all files in All.txt that are NOT in Other.txt
Dim allNotInOthers As String() = allFiles.Except(OtherFiles).ToArray()
' And array of all files in Other.txt that are NOT in All.txt
Dim otherNotInAll As String() = OtherFiles.Except(allFiles).ToArray()

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LVL 64

Expert Comment

by:Fernando Soto
ID: 39904348
Hi LuckyLucks;

In your question you have VB code snippet but in the question tag you have .Net and C#. If you need to have the code translated to C# please let me know.
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Author Comment

by:LuckyLucks
ID: 39907603
C#
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LVL 64

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 39907780
// Read all the file names and remove directory part and store in array
string[] allFiles  = File.ReadAllLines(@"C:\logs\All.txt")
                         .Select(f => Path.GetFileName(f)).ToArray();

string[] OtherFiles = File.ReadAllLines(@"C:\logs\Other.txt")
                          .Select(f => Path.GetFileName(f)).ToArray();

// And array of all files in All.txt that are NOT in Other.txt
string[] allNotInOthers = allFiles.Except(OtherFiles).ToArray();
// And array of all files in Other.txt that are NOT in All.txt
string[] otherNotInAll = OtherFiles.Except(allFiles).ToArray();               

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