C# Tutorial

C# FileStream

In c#,FileStream is a class ofSystem.IO namespace, and it will provide a stream for file operations. By using FileStream, we can perform read and write operations on files.

Now, we will see how to useFileStream class in c# to write and read text from a file with examples.

C# FileStream Write to File Example

Following is the example of writing a text to file using the FileStream object in c#.

using System.Text;
using System.IO;

namespace TutlaneExamples
{
class Program
{
static void Main(string[] args)
{
string fpath = @"D:\Test.txt";
// Delete file if exists
if (File.Exists(fpath))
{
File.Delete(fpath);
}
// Create the file
using (FileStream fs = File.Create(fpath))
{
AddTexttoFile(fs, "Hi");
AddTexttoFile(fs, "\r\nWelcome to Tutlane");
AddTexttoFile(fs, "\r\nFileStream Example");
}
}
private static void AddTexttoFile(FileStream fs, string value)
{
byte[] info = new UTF8Encoding(true).GetBytes(value);
fs.Write(info, 0, info.Length);
}
}
}

If you observe the above example, we imported a System.IO namespace to accessFile &FileStream objects to delete, create and write a text to file. Here, we added text to the file by converting it into bytes format using theAddTexttoFilemethod.

When we execute the above example, it will create a new “Test.txt” file in the D drive with the required text as shown below.

C# FileStream Write to File Example Result

This is how we can create, delete and add text to files usingFile &FileStream objects in c#.

C# FileStream Read Text from File Example

Following is the example of reading text from a file using theFileStream object in c#.

using System;
using System.IO;
using System.Text;

namespace TutlaneExamples
{
class Program
{
static void Main(string[] args)
{
string fpath = @"D:\Test.txt";
// Check if file exists
if (File.Exists(fpath))
{
// Open the file and read
using (FileStream fs = File.OpenRead(fpath))
{
byte[] b = new byte[1024];
UTF8Encoding encode = new UTF8Encoding(true);
while (fs.Read(b, 0, b.Length) > 0)
{
Console.WriteLine(encode.GetString(b));
}
}
}
Console.ReadLine();
}
}
}

If you observe the above example, we imported a System.IO namespace to accessFile &FileStream objects to check and read text from a file.

When you execute the above example, it will read the text from “Test.txt” file inD drive and return the result as shown below.

C# FileStream Read Text from File Example Result

This is how we can useFileStream class in c# to write or read data from the file in the file system.

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C# Tutorial

C# FileStream

C# FileStream Write to File Example

C# FileStream Read Text from File Example

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