C# StreamReader

C# StreamReader class is used to read string from the stream. It inherits TextReader class. It provides Read() and ReadLine() methods to read data from the stream.

C# StreamReader example to read one line

Let's see the simple example of StreamReader class that reads a single line of data from the file.

1. using System;  
2. using System.IO;  
3. public class StreamReaderExample  
4. {  
5.     public static void Main(string[] args)  
6.     {  
7.         FileStream f = new FileStream("e:\\output.txt", FileMode.OpenOrCreate);  
8.         StreamReader s = new StreamReader(f);  
9.   
10.         string line=s.ReadLine();  
11.         Console.WriteLine(line);  
12.   
13.         s.Close();  
14.         f.Close();  
15.     }  
16. }  

Output:

Hello C#

C# StreamReader example to read all lines

1. using System;  
2. using System.IO;  
3. public class StreamReaderExample  
4. {  
5.     public static void Main(string[] args)  
6.     {  
7.         FileStream f = new FileStream("e:\\a.txt", FileMode.OpenOrCreate);  
8.         StreamReader s = new StreamReader(f);  
9.   
10.         string line = "";  
11.         while ((line = s.ReadLine()) != null)  
12.         {  
13.             Console.WriteLine(line);  
14.         }  
15.         s.Close();  
16.         f.Close();  
17.     }  
18. }  

Output:

Hello C#
this is file handling