Files C#

Mar 12, 2023 00:00 · 214 words · 2 minute read

Examples of working with binary and text files C#

Creation methods: 🔗

FileStream(string filename, FileMode mode) ,
FileMode(Append,Create,CreateNew,Open,OpenOrCreate,Truncate)
File.Open(string file, FileMode mode),
File.OpenRead(string file), File.OpenWrite(string file);

Main properties: Length, Position

Main methods:

CopyTo(Stream destination),
int Read(byte[] array, int offset, int count),
long Seek(long offset, SeekOrigin origin),
void Write(byte[] array, int offset, int count)
ValueTask WriteAsync(byte[] array, int offset, int count),
Task CopyToAsync(Stream destination)

Helper classes: StreamReader and StreamWriter text BinaryWriter, BinaryReader binary data

SeekOrigin.Begin: the beginning of the file, SeekOrigin.End: the end of the file, SeekOrigin.Current: the current position in the file
fstream.Seek(-5, SeekOrigin.End);

Ways to use: 🔗

try
{
     fstream=
new FileStream(@"f.dat",
FileMode.OpenOrCreate);
}
catch(Exceptionex)
{
}
finally
{
     if (fstream != null)
         fstream.Close();
}

or using

using (var fs =
   new FileStream(@"filePath",
   FileMode…, FileAccess…))

{

}

Working with text files 🔗

using System;
using System.Text;
using System.Threading.Tasks;
using System.IO;

FileStream fs =
new FileStream(@"ft.txt",
FileMode.OpenOrCreate, FileAccess.Write);
using (var sw = new StreamWriter(fs)){
     sw.WriteLine(@"text\file");
}
fs.Close();

using(varfsr=
        new FileStream(@"ft.txt", FileMode.Open,
        FileAccess.Read))
{
using (var sr= new StreamReader(fsr))
{
varstr = sr.ReadLine();
Console Write(str);
}
}

Working with binary files 🔗

using (var fs = new FileStream(@"fb.bin", FileMode.OpenOrCreate, FileAccess.Write)){
   using (var bw = new BinaryWriter(fs))
  {
      bw Write((int)200);
  }
}
using (var fs = File.OpenRead(@"fb.bin")){
   using (var br = new BinaryReader(fs)){
     varv = br.ReadInt32();
     Console.WriteLine(v);
   }
}
csharp files