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Chapter 12: Filesystem I/O
be accurate for a stream you send to or receive from that other operating system. Of
course, if you are doing Web Services, newlines aren’t your biggest concern.
See Also
See the “Environment Class” topic in the MSDN documentation.
12.8 Creating, Writing to, and Reading from a File
Problem
You need to create a file—possibly for logging information to or for storing tempo-
rary information—and then write information to it. You also need to be able to read
the information that you wrote to this file.
Solution
To create, write to, and read from a logfile, we will use the FileStream and its reader
and writer classes. For example, we will create methods to allow construction, read-
ing to, and writing from a logfile. To create a logfile, you can use the following code:
FileStream fileStream = new FileStream(logFileName,
FileMode.Append,
FileAccess.Write,
FileShare.None);
To write text to this file, you can create a StreamWriter object wrapper around the
previously created
FileStream object (fileStream). You can then use the WriteLine
method of the StreamWriter object. The following code writes three lines to the file: a
string, followed by an integer, followed by a second string:
public static void WriteToLog(string logFileName, string data)
{
using (FileStream fileStream ...