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When you create desktop applications, the ability to save information between user sessions is imperative. This chapter examines a number of I/O-related topics as seen through the eyes of the .NET Framework. The first order of business is to explore the core types defined in the System.IO namespace and learn how to modify a machine s directory and file structure programmatically. The next task is to explore various ways to read from and write to character-based, binary-based, string-based, and memory-based data stores. After you learn how to manipulate files and directories using the core I/O types, you will examine the related topic of object serialization. You can use object serialization to persist and retrieve the state of an object to (or from) any System.IO.Stream-derived type. The ability to serialize objects is critical when you want to copy an object to a remote machine using various remoting technologies such as Windows Communication Foundation. However, serialization is quite useful in its own right and will likely play a role in many of your .NET applications (distributed or not).

A better option is to have your server generate a secret user-specific token, put it in a hidden form field, and then check that the token is present and correct when the form is submitted. ASP.NET MVC has a ready-made implementation of this technique.

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In the framework of .NET, the System.IO namespace is the region of the base class libraries devoted to file-based (and memory-based) input and output (I/O) services. Like any namespace, System.IO defines a set of classes, interfaces, enumerations, structures, and delegates, most of which you can find in mscorlib.dll. In addition to the types contained within mscorlib.dll, the System.dll assembly defines additional members of the System.IO namespace. Note that all Visual Studio 2010 projects automatically set a reference to both assemblies. Many of the types within the System.IO namespace focus on the programmatic manipulation of physical directories and files. However, additional types provide support to read data from and write data to string buffers, as well as raw memory locations. Table 20-1 outlines the core (non-abstract) classes, providing a road map of the functionality in System.IO.

These classes allow you to store and retrieve primitive data types (integers, Booleans, strings, and whatnot) as a binary value. This class provides temporary storage for a stream of bytes that you can commit to storage at a later time. You use these classes to manipulate a machine s directory structure. The Directory type exposes functionality using static members, while the DirectoryInfo type exposes similar functionality from a valid object reference. This class provides detailed information regarding the drives that a given machine uses. You use these classes to manipulate a machine s set of files. The File type exposes functionality using static members, while the FileInfo type exposes similar functionality from a valid object reference. This class gives you random file access (e.g., seeking capabilities) with data represented as a stream of bytes. This class allows you to monitor the modification of external files in a specified directory. This class provides random access to streamed data stored in memory rather than a physical file. This class performs operations on System.String types that contain file or directory path information in a platform-neutral manner. You use these classes to store (and retrieve) textual information to (or from) a file. These types do not support random file access. Like the StreamReader/StreamWriter classes, these classes also work with textual information. However, the underlying storage is a string buffer rather than a physical file.

You can detect and block CSRF attacks by combining ASP.NET MVC s Html.AntiForgeryToken() helper and its [ValidateAntiForgeryToken] filter. To protect a particular HTML form, include Html.AntiForgeryToken() inside the form. Here s an example: <% using(Html.BeginForm()) { %> <%: Html.AntiForgeryToken() %> <!-- rest of form goes here --> <% } %> This will render something like the following:

In addition to these concrete class types, System.IO defines a number of enumerations, as well as a set of abstract classes (e.g., Stream, TextReader, and TextWriter), that define a shared polymorphic interface to all descendents. You will read about many of these types in this chapter.

margin:0 0 .5em .5em; padding:0; font-size:80%; } ul.subnav a { display:block; background:#ddd; margin-bottom:1px; padding:.5em; } ul.subnav a:hover { background:#ccc; margin-bottom:1px; } After viewing our changes in Firefox, everything looks perfect (Figure 14-19), but when we take a look in IE 6, we find the whitespace bug has struck (Figure 14-20).

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