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TextReader.Read Method (Char[], Int32, Int32)

Reads a specified maximum number of characters from the current reader and writes the data to a buffer, beginning at the specified index.

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

abstract Read : 
        buffer:char[] * 
        index:int * 
        count:int -> int  
override Read : 
        buffer:char[] * 
        index:int * 
        count:int -> int

Parameters

buffer
Type: System.Char[]

When this method returns, contains the specified character array with the values between index and (index + count - 1) replaced by the characters read from the current source.

index
Type: System.Int32

The position in buffer at which to begin writing.

count
Type: System.Int32

The maximum number of characters to read. If the end of the reader is reached before the specified number of characters is read into the buffer, the method returns.

Return Value

Type: System.Int32
The number of characters that have been read. The number will be less than or equal to count, depending on whether the data is available within the reader. This method returns 0 (zero) if it is called when no more characters are left to read.

ExceptionCondition
ArgumentNullException

buffer is a null reference (Nothing in Visual Basic).

ArgumentException

The buffer length minus index is less than count.

ArgumentOutOfRangeException

index or count is negative.

ObjectDisposedException

The TextReader is closed.

IOException

An I/O error occurs.

This method returns after either count characters are read or the end of the file is reached. ReadBlock is a blocking version of this method.

The TextReader class is an abstract class. Therefore, you do not instantiate it in your code. For an example of using the Read method, see the StreamReader.Read method.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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