StreamWriter Constructor (Stream, Encoding)

StreamWriter Constructor (Stream, Encoding)


Initializes a new instance of the StreamWriter class for the specified stream by using the specified encoding and the default buffer size.

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

public StreamWriter(
	Stream stream,
	Encoding encoding


Type: System.IO.Stream

The stream to write to.

Type: System.Text.Encoding

The character encoding to use.

Exception Condition

stream or encoding is null.


stream is not writable.

This constructor initializes the Encoding property using the encoding parameter, and the BaseStream property using the stream parameter. The position of the stream is not reset. For additional information, see Encoding.

The StreamWriter object calls Dispose() on the provided Stream object when StreamWriter.Dispose is called.


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 example demonstrates this constructor.

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

namespace ConsoleApplication
    class Program
        static void Main(string[] args)
            string fileName = "test.txt";
            string textToAdd = "Example text in file";
            FileStream fs = null;
               fs = new FileStream(fileName, FileMode.CreateNew);
               using (StreamWriter writer = new StreamWriter(fs, Encoding.Default))
                if (fs != null)

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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