Artigo
11/18/2011

TextReader Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents a reader that can read a sequential series of characters.

Inheritance Hierarchy

System.Object
  System.IO.TextReader
    System.IO.StreamReader
    System.IO.StringReader

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

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public MustInherit Class TextReader _
    Implements IDisposable

[ComVisibleAttribute(true)]
public abstract class TextReader : IDisposable

The TextReader type exposes the following members.

Constructors

	Name	Description
	TextReader	Initializes a new instance of the TextReader class.

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Methods

	Name	Description
	Close	Closes the TextReader and releases any system resources associated with the TextReader.
	Dispose()	Releases all resources used by the TextReader object.
	Dispose(Boolean)	Releases the unmanaged resources used by the TextReader and optionally releases the managed resources.
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	Peek	Reads the next character without changing the state of the reader or the character source. Returns the next available character without actually reading it from the input stream.
	Read()	Reads the next character from the input stream and advances the character position by one character.
	Read(array<Char[], Int32, Int32)	Reads a maximum of count characters from the current stream and writes the data to buffer, beginning at index.
	ReadBlock	Reads a maximum of count characters from the current stream, and writes the data to buffer, beginning at index.
	ReadLine	Reads a line of characters from the current stream and returns the data as a string.
	ReadToEnd	Reads all characters from the current position to the end of the TextReader and returns them as one string.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Fields

	Name	Description
	Null	Provides a TextReader with no data to read from.

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Remarks

TextReader is the abstract base class of StreamReader and StringReader, which read characters from streams and strings, respectively. 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.

Notes to Inheritors

A derived class must minimally implement the Peek and Read methods to make a useful instance of TextReader.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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