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StreamReader Constructor (Stream)

Updated: December 2010

Initializes a new instance of the StreamReader class for the specified stream.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

public StreamReader(
	Stream stream
)

Parameters

stream
Type: System.IO.Stream

The stream to be read.

ExceptionCondition
ArgumentException

stream does not support reading.

ArgumentNullException

stream is null.

This constructor initializes the encoding to UTF8Encoding, the BaseStream property using the stream parameter, and the internal buffer to the default size.

The StreamReader object calls Dispose on the provided Stream object when StreamReader.Dispose is called.

Caution noteCaution:

When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.

For a list of common I/O tasks, see Common I/O Tasks.

The following code example demonstrates this StreamReader constructor.

using System;
using System.IO;

class Test 
{
	
    public static void Main() 
    {
        string path = @"c:\temp\MyTest.txt";

        try 
        {
            if (File.Exists(path)) 
            {
                File.Delete(path);
            }

            using (StreamWriter sw = new StreamWriter(path)) 
            {
                sw.WriteLine("This");
                sw.WriteLine("is some text");
                sw.WriteLine("to test");
                sw.WriteLine("Reading");
            }

            using (FileStream fs = new FileStream(path, FileMode.Open)) 
            {
                using (StreamReader sr = new StreamReader(fs)) 
                {

                    while (sr.Peek() >= 0) 
                    {
                        Console.WriteLine(sr.ReadLine());
                    }
                }
            }
        } 
        catch (Exception e) 
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Date

History

Reason

December 2010

Added information about Dispose.

Information enhancement.

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