How to check if two files are the same .NET C#?

Question

How can I check if the contents of a file and some words that were inputted are the same? I want to make some sort of activation system, where it will check if the contents are the same as the input.

Here's what I want to do:

using System.Collections.Generic;
using System;
using System.IO;

namespace Example {
  public class Example() {
    string input = Console.ReadLine();
    if (input == File(@"/prodkey.txt") {
      //code
    }
  }
}

The exact same, like a password? Or do you mean like search where it is looking to find all of the words somewhere in the document? As a sentence, or with the words appearing in any order> — Dave S, Feb 09 '23 at 18:04
Does this answer your question? [How to compare 2 files fast using .NET?](https://stackoverflow.com/questions/1358510/how-to-compare-2-files-fast-using-net) — SiKing, Feb 09 '23 at 18:06
Your title says "two files" but your question and code say "words that were inputted" -- which is it? Please edit your question to add more information. — Dave S, Feb 09 '23 at 18:06
@Dave S And yes, as soon as i posted it, i found out that it said "two files" instead of "words that were inputted. I forgot to fix it. — Marko2155, Feb 09 '23 at 21:16

score 2 · Accepted Answer · answered Feb 09 '23 at 18:17

You can use File.ReadAllText(filePath) to get the contents of a text file, and then compare them using the == operator, or the string.Equals method (which provides for case-insensitive comparison):

string input = Console.ReadLine();
string fileContent = File.ReadAllText(@"/prodkey.txt");

if (input == fileContent) 
{
  
}

// Or, for case-insensitive comparison:
if (input.Equals(fileContent, StringComparison.OrdinalIgnoreCase))
{
  
}

How to check if two files are the same .NET C#?

1 Answers1