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TextReader::ReadBlock Method

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

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

public:
virtual int ReadBlock(
	[InAttribute] [OutAttribute] array<wchar_t>^ buffer, 
	int index, 
	int count
)

Parameters

buffer
Type: array<System::Char>

When this method returns, this parameter 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.

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 all input characters have been read.

ExceptionCondition
ArgumentNullException

buffer is nullptr.

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.

The position of the underlying text reader is advanced by the number of characters that were read into buffer.

The method blocks until either count characters are read, or all characters have been read. This is a blocking version of Read.

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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