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Opens the file if it exists and seeks to the end of the file, or creates a new file. Specifies that the operating system should create a new file. If the file already exists, it will be overwritten. Specifies that the operating system should create a new file. If the file already exists, an IOException is thrown. Specifies that the operating system should open an existing file. Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. Specifies that the operating system should open an existing file. Once opened, the file will be truncated so that its size is 0 bytes.

Combine() ChangeExtension()

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In this chapter, you got a taste of ASP.NET s XML features. The class libraries for interacting with XML are available to any .NET application, whether it s a Windows application, a web application, or a simple command-line tool. They provide one of the most fully featured toolkits for working with XML and other standards such as XPath, XML Schema, and XSLT. XML is a vast topic, and there is much more to cover, such as advanced navigation, search and selection techniques, validation, and serialization. If you want to learn more about XML in .NET, you may want to refer to Pro .NET XML (Apress, 2005). But remember that you should use XML only where it s warranted. XML is a great tool for persisting file-based data in a readable format and for sharing information with other application components and services. However, it doesn t replace the core data management techniques you ve seen in previous chapters.

And here s how you can open a FileStream and read its contents into a byte array: Dim fStream As FileStream = Nothing Try fStream = New FileStream(fileName, FileMode.Open) Dim dataArray As Byte() = New Byte(fStream.Length - 1) {} Dim i As Integer = 0 Do While i < fStream.Length dataArray(i) = fStream.ReadByte() i += 1 Loop Finally If fStream IsNot Nothing Then fStream.Close() End If End Try On their own, streams aren t that useful. That s because they work entirely in terms of single bytes and byte arrays. .NET includes a more useful higher-level model of writer and reader objects that fill the gaps. These objects wrap stream objects and allow you to write more complex data, including common data types such as integers, strings, and dates. You ll see readers and writers at work in the following sections.

Combines a path with a filename or a subdirectory. Modifies the current extension of the file in a string. If no extension is specified, the current extension will be removed. Returns all the directory information, which is the text between the first and last directory separators (\). Returns just the filename portion of a path. This method is similar to GetFileName(), but it omits the extension from the returned string. This method has no effect on an absolute path, and it changes a relative path into an absolute path using the current directory. For example, if c:\Temp\ is the current directory, calling GetFullPath() on a filename such as test.txt returns c:\Temp\test.txt. Retrieves a string with the root (for example, C:\), provided that information is in the string. For a relative path, it returns a null reference. Returns true if the path ends with an extension. Returns true if the path is an absolute path and false if it s a relative path.

ost web applications rely heavily on databases to store information. Databases are unmatched in multiuser scenarios. They handle simultaneous access without a hitch, and they support caching and low-level disk optimizations that guarantee blistering performance. Quite simply, an RDBMS (Relational Database Management System) offers the most robust and best-performing storage for data. Of course, most web developers inevitably face a scenario where they need to access data in other locations, such as the file system. Common examples include reading information produced by another application, writing a quick-and-dirty log for testing purposes, and creating a management page that allows administrators to upload files and view what s currently on the server. In this chapter, you ll learn how to use the classes in the System.IO namespace to get file system information, work with file paths as strings, write and read files, and serialize objects.

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