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As usual, you can do more harm than good if you don t measure the impact on performance carefully on a suitable range of your target systems. Most applications will not need to touch this value.

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Even if you don t need to tune performance, you still need to be aware of buffering for robustness reasons. If either the process or the OS crashes before the buffers are written out to the physical disk, you run the risk of data loss (hence the reason write buffering is typically disabled on the server). If you re writing frequently to a Stream or StreamWriter, the .NET Framework will flush the write buffers periodically. It also ensures that everything is properly flushed when the stream is closed. However, if you just stop writing data but you leave the stream open, there s a good chance data will hang around in memory for a long time without getting written out, at which point data loss starts to become more likely. In general, you should close files as early as possible, but sometimes you ll want to keep a file open for a long time, yet still ensure that particular pieces of data get written out. If you need to control that yourself, you can call Flush. This is particularly useful if you have multiple threads of execution accessing the same stream. You can synchronize writes and ensure that they are flushed to disk before the next worker gets in and messes things up! Later in this chapter, we ll see an example where explicit flushing is extremely important.

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Another parameter we can set in the constructor is the FileSystemRights. We used this type earlier in the chapter to set filesystem permissions. FileStream lets us set these directly when we create a file using the appropriate constructor. Similarly, we can also specify an instance of a FileSecurity object to further control the permissions on the underlying file.

Finally, we can optionally pass another enumeration to the FileStream constructor, FileOptions, which contains some advanced filesystem options. They are enumerated in Table 11-9. This is a flags-style enumeration, so you can combine these values.

Figure 9-6. The while loop The following code shows an example of the while loop, where the test expression variable starts with a value of 3 and is decremented at each iteration. The loop exits when the value of the variable becomes 0. int x = 3; while( x > 0 ) { Console.WriteLine("x: {0}", x); x--; } Console.WriteLine("Out of loop"); The output from this code is the following: x: x: x: Out 3 2 1 of loop

Purpose No options at all. Ignores any filesystem-level buffers, and writes directly to the output device. This affects only the O/S, and not any of the other layers of buffering, so it s still your responsibility to call Flush. Indicates that we re going to be seeking about in the file in an unsystematic way. This acts as a hint to the OS for its caching strategy. We might be writing a video-editing tool, for example, where we expect the user to be leaping about through the file. Indicates that we re going to be sequentially reading from the file. This acts as a hint to the OS for its caching strategy. We might be writing a video player, for example, where we expect the user to play through the stream from beginning to end. Indicates that we want the file to be encrypted so that it can be decrypted and read only by the user who created it. Deletes the file when it is closed. This is very handy for temporary files. If you use this option, you never hit the problem where the file still seems to be locked for a short while even after you ve closed it (because its buffers are still flushing asynchronously). Allows the file to be accessed asynchronously.

Long-running file operations are a common bottleneck. How many times have you clicked the Save button, and seen the UI lock up while the disk operation takes place (especially if you re saving a large file to a network location) Developers commonly resort to a background thread to push these long operations off the main thread so that they can display some kind of progress or please wait UI (or let the user carry on working). We ll look at that approach in 16; but you don t necessarily have to go that far. You can use the asynchronous mode built into the stream instead. To see how it works, look at Example 11-47.