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StreamReader Constructor (String, Encoding)

Initializes a new instance of the StreamReader class for the specified file name, with the specified character encoding.

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

public StreamReader (
	string path,
	Encoding encoding
)
public StreamReader (
	String path, 
	Encoding encoding
)
public function StreamReader (
	path : String, 
	encoding : Encoding
)

Parameters

path

The complete file path to be read.

encoding

The character encoding to use.

Exception typeCondition

ArgumentException

path is an empty string ("").

ArgumentNullException

path or encoding is a null reference (Nothing in Visual Basic).

FileNotFoundException

The file cannot be found.

DirectoryNotFoundException

The specified path is invalid, such as being on an unmapped drive.

NotSupportedException

path includes an incorrect or invalid syntax for file name, directory name, or volume label.

This constructor initializes the encoding as specified by the encoding parameter, and the internal buffer to the default size.

The path parameter can be a file name, including a file on a Universal Naming Convention (UNC) share.

The path parameter is not required to be a file stored on disk; it can be any part of a system that supports access using streams.

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 an example of using this method, see the Example section. The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Create a text file.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Append text to a file.

How to: Open and Append to a Log File

File.AppendText

FileInfo.AppendText

Get the size of a file.

FileInfo.Length

Get the attributes of a file.

File.GetAttributes

Set the attributes of a file.

File.SetAttributes

Determine if a file exists.

File.Exists

Read from a binary file.

How to: Read and Write to a Newly Created Data File

Write to a binary file.

How to: Read and Write to a Newly Created Data File

The following code example demonstrates this StreamReader constructor.

private void getNewStreamReader() 
{
    //Get a new StreamReader in ASCII format from a
    //file using a buffer and byte order mark detection
    StreamReader srAsciiFromFileFalse512 = 
        new StreamReader("C:\\Temp\\Test.txt",
        System.Text.Encoding.ASCII, false, 512);
    //Get a new StreamReader in ASCII format from a
    //file with byte order mark detection = false
    StreamReader srAsciiFromFileFalse = 
        new StreamReader("C:\\Temp\\Test.txt",
        System.Text.Encoding.ASCII, false);
    //Get a new StreamReader in ASCII format from a file 
    StreamReader srAsciiFromFile = 
        new StreamReader("C:\\Temp\\Test.txt",
        System.Text.Encoding.ASCII);
    //Get a new StreamReader from a
    //file with byte order mark detection = false
    StreamReader srFromFileFalse = 
        new StreamReader("C:\\Temp\\Test.txt", false);
    //Get a new StreamReader from a file
    StreamReader srFromFile = 
        new StreamReader("C:\\Temp\\Test.txt");
    //Get a new StreamReader in ASCII format from a
    //FileStream with byte order mark detection = false and a buffer
    StreamReader srAsciiFromStreamFalse512 = new StreamReader(
        (System.IO.Stream)File.OpenRead("C:\\Temp\\Test.txt"),
        System.Text.Encoding.ASCII, false, 512);
    //Get a new StreamReader in ASCII format from a
    //FileStream with byte order mark detection = false
    StreamReader srAsciiFromStreamFalse = new StreamReader(
        (System.IO.Stream)File.OpenRead("C:\\Temp\\Test.txt"),
        System.Text.Encoding.ASCII, false);
    //Get a new StreamReader in ASCII format from a FileStream
    StreamReader srAsciiFromStream = new StreamReader(
        (System.IO.Stream)File.OpenRead("C:\\Temp\\Test.txt"),
        System.Text.Encoding.ASCII);
    //Get a new StreamReader from a
    //FileStream with byte order mark detection = false
    StreamReader srFromStreamFalse = new StreamReader(
        (System.IO.Stream)File.OpenRead("C:\\Temp\\Test.txt"), 
        false);
    //Get a new StreamReader from a FileStream
    StreamReader srFromStream = new StreamReader(
        (System.IO.Stream)File.OpenRead("C:\\Temp\\Test.txt"));
}

private void GetNewStreamReader()
{
    //Get a new StreamReader in ASCII format from a
    //file using a buffer and byte order mark detection
    StreamReader srAsciiFromFileFalse512 =
        new StreamReader("C:\\Temp\\Test.txt",
        System.Text.Encoding.get_ASCII(), false, 512);

    //Get a new StreamReader in ASCII format from a
    //file with byte order mark detection = false
    StreamReader srAsciiFromFileFalse =
        new StreamReader("C:\\Temp\\Test.txt",
        System.Text.Encoding.get_ASCII(), false);

    //Get a new StreamReader in ASCII format from a file 
    StreamReader srAsciiFromFile =
        new StreamReader("C:\\Temp\\Test.txt",
        System.Text.Encoding.get_ASCII());

    //Get a new StreamReader from a
    //file with byte order mark detection = false
    StreamReader srFromFileFalse =
        new StreamReader("C:\\Temp\\Test.txt", false);

    //Get a new StreamReader from a file
    StreamReader srFromFile = new StreamReader("C:\\Temp\\Test.txt");

    //Get a new StreamReader in ASCII format from a
    //FileStream with byte order mark detection = false and a buffer
    StreamReader srAsciiFromStreamFalse512 =
        new StreamReader(((System.IO.Stream)
        (File.OpenRead("C:\\Temp\\Test.txt"))),
        System.Text.Encoding.get_ASCII(), false, 512);

    //Get a new StreamReader in ASCII format from a
    //FileStream with byte order mark detection = false
    StreamReader srAsciiFromStreamFalse =
        new StreamReader(((System.IO.Stream)
        (File.OpenRead("C:\\Temp\\Test.txt"))),
        System.Text.Encoding.get_ASCII(), false);

    //Get a new StreamReader in ASCII format from a FileStream
    StreamReader srAsciiFromStream =
        new StreamReader(((System.IO.Stream)
        (File.OpenRead("C:\\Temp\\Test.txt"))),
        System.Text.Encoding.get_ASCII());

    //Get a new StreamReader from a
    //FileStream with byte order mark detection = false
    StreamReader srFromStreamFalse =
        new StreamReader(((System.IO.Stream)
        (File.OpenRead("C:\\Temp\\Test.txt"))), false);

    //Get a new StreamReader from a FileStream
    StreamReader srFromStream =
        new StreamReader(((System.IO.Stream)
        (File.OpenRead("C:\\Temp\\Test.txt"))));
} //GetNewStreamReader

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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