Writes a line terminator to the text string or stream. Public Overrides Sub Write (value As String) Writes the text representation of a 4-byte signed integer to the text string or stream. Public Overridable Sub Write (value As Integer) Writes the text representation of an 8-byte floating-point value to the text string or stream. Public Overridable Sub Write (value As Double) Although, if you don't explicitly need the StreamWriter object, I would recommend using what others have suggested: File.AppendAllText. StreamWriter sw new StreamWriter (File.Open (Path, System.IO.FileMode.Append)) This is just one way to do it. Writes the text representation of a decimal value to the text string or stream. To append text to a file, you can open it using FileMode.Append. Public Overridable Sub Write (value As Decimal) Public Overrides Sub Write (value As Char) Writes the text representation of a Boolean value to the text string or stream. Public Overridable Sub Write (value As Boolean) The following table shows some of the most commonly used methods of this class − Sr.No.Ĭloses the current StreamWriter object and the underlying stream.Ĭlears all buffers for the current writer and causes any buffered data to be written to the underlying stream. The StreamWriter class inherits from the abstract class TextWriter that represents a writer, which can write a series of character. Guess what it displays when you compile and run the program! The StreamWriter Class ' Read and display lines from the file until the end ofĬonsole.WriteLine("The file could not be read:") Using sr As StreamReader = New StreamReader("e:/jamaica.txt") ' The using statement also closes the StreamReader. ' Create an instance of StreamReader to read from a file. The file reads −Īnd the sun shines daily on the mountain top The following example demonstrates reading a text file named Jamaica.txt. Reads the next character from the input stream and advances the character position by one character. Public Overrides Function Read As Integer Returns the next available character but does not consume it. Public Overrides Function Peek As Integer It closes the StreamReader object and the underlying stream and releases any system resources associated with the reader. The following table describes some of the commonly used methods of the StreamReader class − Sr.No. The StreamReader class also inherits from the abstract base class TextReader that represents a reader for reading series of characters. ![]() These classes inherit from the abstract base class Stream, which supports reading and writing bytes into a file stream. The user lacks necessary permissions to view the path ( SecurityException).The StreamReader and StreamWriter classes are used for reading from and writing data to text files. ![]() The path exceeds the system-defined maximum length ( PathTooLongException).Ī file or directory name in the path contains a colon (:) or is in an invalid format ( NotSupportedException). The file is in use by another process, or an I/O error occurs ( IOException). The path is not valid because it is Nothing ( ArgumentNullException).įile points to a path that does not exist ( FileNotFoundException or DirectoryNotFoundException). The path is not valid for one of the following reasons: it is a zero-length string, it contains only white space, it contains invalid characters, or it is a device path (starts with \\.\) ( ArgumentException). The following conditions may cause an exception: Dim inputString As String = "This is a test string." ![]() This example writes the string "This is a test string." to the file named Testfile.txt. Use the WriteAllText method, specifying the target file and string to be appended and setting the append parameter to True. The WriteAllText method can be used to append to a text file by specifying that the append parameter is set to True.
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