C# 0 The Complete Reference

MemoryStream

 called 

memstrm

. From 

memstrm

 are created a 

StreamReader

 called 

memrdr

 and a 

StreamWriter

 called 

memwtr

. Using 

memwtr

, output 

is written to the memory-based stream. Notice that after the output has been written, 

Flush( )

is called on 

memwtr

. This is necessary to ensure that the contents of 

memwtr

’s buffer are 

actually written to the underlying array. Next, the contents of the underlying byte array are 

displayed manually, using a 

foreach

 loop. Then, using 

Seek( )

, the file pointer is reset to the 

start of the stream, and the memory stream is read using 

memrdr

.

Memory-based streams are quite useful in programming. For example, you can construct 

complicated output in advance, storing it in the array until it is needed. This technique is 

especially useful when programming for a GUI environment, such as Windows. You can 

also redirect a standard stream to read from an array. This might be useful for feeding test 

information into a program, for example.

StringReader_and_StringWriter'>Using StringReader and StringWriter

For some applications, it might be easier to use a 

string

 rather than a 

byte

 array for the 

underlying storage when performing memory-based I/O operations. When this is the case, 

use

StringReader

 and 

StringWriter

.

StringReader

 inherits 

TextReader

, and 

StringWriter

inherits

TextWriter

. Thus, these streams have access to methods defined by those two 

classes. For example, you can call 

ReadLine( )

 on a 

StringReader

 and 

WriteLine( )

 on a 

StringWriter

.

The constructor for 

StringReader

 is shown here:

StringReader(string

str

)

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