Parameters

buffer

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

The position in buffer at which to begin writing.

count

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.

Returns

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.

Exceptions

Type	Reason
ArgumentNullException	buffer is null.
ArgumentException	(index + count ) > buffer.Length.
ArgumentOutOfRangeException	index < 0 - or- count < 0.
System.IO.IOException	An I/O error occurred.

Remarks

This method returns after either count characters are read or the end of the file is reached. TextReader.ReadBlock(Char[], int, int) is a blocking version of this method.

The System.IO.TextReader class is an abstract class. Therefore, you do not instantiate it in your code. For an example of using the TextReader.Read(Char[], int, int) method, see the StreamReader.Read(Char[], int, int) method.

Requirements