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Allows you to retrieve or set attributes using a combination of values from the FileAttributes enumeration. Allows you to set or retrieve the creation time, last access time, and last write time using a DateTime object. Returns true or false depending on whether the file or directory exists. In other words, you can create FileInfo and DirectoryInfo objects that don t actually correspond to current physical directories, although you obviously won t be able to use properties such as CreationTime and methods such as MoveTo(). Returns a string that represents the fully qualified name, the directory or filename (with extension), or the extension on its own, depending on which property you use. Removes the file or directory, if it exists. When deleting a directory, it must be empty, or you must specify an optional parameter set to true. Updates the object so it s synchronized with any file system changes that have happened in the meantime (for example, if an attribute was changed manually using Windows Explorer). Creates the specified directory or file. Copies the directory and its contents or the file. For a DirectoryInfo object, you need to specify the new path; for a FileInfo object, you specify a path and filename.

.NET 2.0 adds built-in support for compressing data in any stream. This trick allows you to compress data that you write to any file. The support comes from two classes in the new System.IO.Compression namespace: GZipStream and DeflateStream. Both of these classes represent similarly efficient lossless compression algorithms. To use compression, you need to wrap the real stream with one of the compression streams. For example, you could wrap a FileStream (for compressing data as it s written to disk) or a MemoryStream (for compressing data in memory). Using a MemoryStream, you could compress data before storing it in a binary field in a database or sending it to a web service.

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You can also write to a binary file. Binary data uses space more efficiently but also creates files that aren t readable. If you open a binary file in Notepad, you ll see a lot of extended characters (politely known as gibberish). To open a file for binary writing, you need to create a new BinaryWriter class. The class constructor accepts a stream, which you can create by hand or retrieve using the File.OpenWrite() method. Here s the code to open the file c:\binaryfile.bin for binary writing: BinaryWriter w = new BinaryWriter(File.OpenWrite(@"c:\binaryfile.bin")); .NET concentrates on stream objects, rather than the source or destination for the data. This means you can write binary data to any type of stream, whether it represents a file or some other type of storage location, using the same code. In addition, writing to a binary file is almost the same as writing to a text file, as you can see here: string str = "ASP.NET Binary File Test"; int integer = 1000; w.Write(str); w.Write(integer); w.Flush(); w.Close(); Unfortunately, when you read data, you need to know the data type you want to retrieve. To retrieve a string, you use the ReadString() method. To retrieve an integer, you must use ReadInt32(), as follows: BinaryReader r = new BinaryReader(File.OpenRead(@"c:\binaryfile.bin")); string str; int integer; str = r.ReadString(); integer = r.ReadInt32();

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For example, imagine you want to compress data saved to a file. First, you create the FileStream: Dim fStream As New FileStream("c:\myfile.txt", FileMode.Create) Next, you create a GZipStream or DeflateStream, passing in the FileStream and a CompressionMode value that indicates whether you are compressing or decompressing data: Dim compressStream As New GZipStream(fileStream, CompressionMode.Compress) To write your actual data, you use the Write() method of the compression stream, not the FileStream. The compression stream compresses the data and then passes the compressed data to the underlying FileStream. If you want to use a higher-level writer, such as the StreamWriter or BinaryWriter, you supply the compression stream instead of the FileStream: Dim w As New StreamWriter(compressStream) Now you can perform your writing through the writer object. When you re finished, flush the GZipStream so that all the data ends up in the file: w.Flush() fileStream.Close() Reading a file is just as straightforward. The difference is that you create a compression stream with the CompressionMode.Decompress option, as shown here: Dim fStream As New FileStream("c:\myfile.bin", FileMode.Open) Dim decompressStream As New GZipStream(fileStream, CompressionMode.Decompress) Dim r As New StreamReader(decompressStream)

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There s no easy way to jump to a location in a text or binary file without reading through all the information in order. While you can use methods such as Seek() on the underlying stream, you need to specify an offset in bytes. This involves some fairly involved calculations to determine variable sizes. If you need to store a large amount of information and move through it quickly, you need a dedicated database, not a binary file.

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