StreamReader Constructor (String, Boolean)
Assembly: mscorlib (in mscorlib.dll)
public StreamReader ( String path, boolean detectEncodingFromByteOrderMarks )
public function StreamReader ( path : String, detectEncodingFromByteOrderMarks : boolean )
Parameters
- path
The complete file path to be read.
- detectEncodingFromByteOrderMarks
Indicates whether to look for byte order marks at the beginning of the file.
This constructor initializes the encoding to UTF8Encoding, the BaseStream property using the stream 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.
The detectEncodingFromByteOrderMarks parameter detects the encoding by looking at the first three bytes of the stream. It automatically recognizes UTF-8, little-endian Unicode, and big-endian Unicode text if the file starts with the appropriate byte order marks. Otherwise, the user-provided encoding is used. See the Encoding.GetPreamble method for more information.
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. | |
| Write to a text file. | |
| Read from a text file. | |
| Append text to a file. | |
| Get the size of a file. | |
| Get the attributes of a file. | |
| Set the attributes of a file. | |
| Determine if a file exists. | |
| Read from a binary file. | |
| Write to a binary 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.
