When you have finished using any type that derives from this type, you should dispose of it either directly or indirectly. This type implements the IDisposable interface. Use these derived classes to open a text file for reading a specified range of characters, or to create a reader based on an existing stream. TextReader is the abstract base class of StreamReader and StringReader, which read characters from streams and strings, respectively. If (Char.IsLetterOrDigit(c) Or Char.IsWhiteSpace(c)) Then Using reader As StreamReader = File.OpenText(filename)Īwait reader.ReadAsync(result, 0, ) Private Async Sub Button_Click_1(sender As Object, e As RoutedEventArgs)ĭim filename As String = "C:\Example\existingfile.txt"ĭim builder As StringBuilder = New StringBuilder() If (char.IsLetterOrDigit(c) || char.IsWhiteSpace(c)) Result = new char Īwait reader.ReadAsync(result, 0, (int))
Using (StreamReader reader = File.OpenText(filename)) StringBuilder builder = new StringBuilder() Private async void Button_Click_1(object sender, RoutedEventArgs e) It checks whether each character is a letter, digit, or white space before adding the character to an instance of the StringBuilder class.
#TEXT READER EXTENSION HOW TO#
The following example shows how to read all the characters in a file by using the StreamReader.ReadAsync(Char, Int32, Int32) method. The StreamReader class derives from TextReader and provides implementations of the members for reading from a stream.
Therefore, you do not instantiate it in your code. The TextReader class is an abstract class. Implements IDisposable Public MustInherit Class TextReader Interface IDisposable Public MustInherit Class TextReader Interface IDisposable type TextReader = class Public abstract class TextReader : MarshalByRefObject, IDisposable type TextReader = class Public abstract class TextReader : MarshalByRefObject, IDisposable public ref class TextReader abstract : IDisposable public ref class TextReader abstract : MarshalByRefObject, IDisposable public abstract class TextReader : IDisposable public abstract class TextReader : MarshalByRefObject, IDisposable Represents a reader that can read a sequential series of characters.
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