How to read all files and read data from these files in specific folder in c#

Question

I want to access all the files of any type(any extension) from a specific folder and I want to read all the data in from these files.

Answer 1

You should start with learning about DirectoryInfo (read directory structure and enumerate files) and FileInfo classes. Then you might want to use FileStream class in order to read files' contents. Here's my simple example to help you get started:

var dirInfo = new DirectoryInfo(@"c:\temp"); // Obtaining DirectoryInfo object for specified path

foreach (var file in dirInfo.EnumerateFiles()) // Enumerating files, file is FileInfo object
{
    Console.WriteLine($"Reading {file.Name}...");
    var fileStream = file.OpenRead(); // obtainig FileStream to read from a file
    var bytesArray = new byte[fileStream.Length]; // allocating array to read into
    fileStream.Read(bytesArray);
    // Do some stuff with the data
    Console.WriteLine(@"Read " + bytesArray.Length + " bytes");
}

Please bear in mind that you need to add using in order to use System.IO namespace:

using System.IO;