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07.20.07
.NET - Beware Of The FileInfo.OpenText() Method
By Mads Kristensen
I'm a big fan of the System.IO.FileInfo object in .NET because it wraps the System.IO.File object nicely in a strongly typed way.
It makes it easier to work with files. The FileInfo class has a method called OpenText that returns a StreamReader instance which can then be read into a string and other things.
If you use the OpenText method read the text of a file, then the easiest way is like so:
Now the content variable contains the text content of the currency.xml file, but there is a problem with this approach.
Because the OpenText method creates a StreamReader instance which we then call the ReadToEnd method on, the StreamReader keeps a lock on the file.
This can cause many problems and must be avoided.
Instead you could do like so, which releases the file handle when the StreamReader is disposed:
This works fine, but we doubled the lines needed to read the text.
This might not be an issue, but then we could just as well just use the StreamReader directly without using the FileInfo class like so:
It is much cleaner than using the FileInfo class and the intent is very clear as well.
Comments
About the Author:
Mads Kristensen currently works as a Senior Developer at Traceworks located in Copenhagen, Denmark. Mads graduated from Copenhagen Technical Academy with a multimedia degree in 2003, but has been a professional developer since 2000. His main focus is on ASP.NET but is responsible for Winforms, Windows- and web services in his daily work as well. A true .NET developer with great passion for the simple solution.
http://www.madskristensen.dk/
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