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because it should not be used when rows will be altered! This is very important to remember, because it can cause many headaches if iterators are unexpectedly invalid because a tree model was changed.

Suppose our application is producing output based on the following template fragment: <b>Error: Your query '%(query)s' did not return any results.</b>

} } public class VisitorRetrievalFilter : ActionFilterAttribute { private readonly IVisitorRepository _repository; public VisitorRetrievalFilter(IVisitorRepository repository) { _repository = repository; } public VisitorRetrievalFilter() : this( new VisitorRepositoryFactory() .BuildRepository()) { }

After the paths are converted to tree row references, g_list_foreach() is used to call remove_row() for every item. Within remove_row(), a new function is used to check whether the row is a category. If the selected row is a category, we know that it will be a root element and will have no parents. Therefore, the following gtk_tree_model_iter_parent() call performs two tasks. First, if the parent iterator is not set, this function will return FALSE, and the category row will not be removed. If the row has a parent, which means that it is a product, the parent iterator will be set and used later in the function. if (gtk_tree_model_iter_parent (model, &parent, &iter))

public override void OnResultExecuting( Performs work in ResultExecutingContext filterContext) OnResultExecuting { Visitor[] visitors = _repository Stores .GetRecentVisitors(10); recent filterContext.Controller Visitors in .ViewData[Constants.ViewData.VISITORS] ViewData = visitors; }

If the attacker is able to cause the variable query to contain, for example <script>evil-script;</script> the resulting HTML snippet would render as <b>Error: Your query '<script>evil-script;</script>' did not return any results.</b> and the attacker s script would execute in the browser, and could, for example, steal the victim user s cookies.

Second, the function retrieves information about the selected product and its parent category. If the product was set to be purchased, its quantity is subtracted from the total product count displayed by the category. Since changing this data will invalidate the iterator, the path is converted into an iterator, and the row is removed from the tree model.

Each of the filters is simple. Most of the code is just for managing the dependency of the IVisitorRepository and building the repository from the factory B. The three lines that are interesting are in the OnResultExecuting method C. We build the visitor and save it D. Then, we get the recent visitors and push them into view data E. The VisitorBuilder class isn t shown, but it s a simple one that constructs a Visitor and populates it with information from the HttpRequest. The next interesting file is the Visitors.ascx partial view, located in /Views/ Shared/Visitors.ascx. Listing 23.13 shows this partial view.

Double-clicks are handled with the row-activated signal of the GtkTreeView. The signal is emitted when the user double-clicks a row, when the user presses the spacebar, Shift+spacebar, Return, or Enter on a noneditable row, or when you call gtk_tree_view_row_activated(). Listing 8-8. Editing a Clicked Row static void row_activated (GtkTreeView *treeview, GtkTreePath *path, GtkTreeViewColumn *column, gpointer data) { GtkTreeModel *model; GtkTreeIter iter; model = gtk_tree_view_get_model (treeview); if (gtk_tree_model_get_iter (model, &iter, path)) { /* Handle the selection ... */ } } In Listing 8-8, the callback function row_activated() is called when the user activates a row within the tree view. The activated row is retrieved from the tree path object with gtk_tree_model_get_iter(). From there, you are free to use whatever functions you have learned thus far to retrieve or alter the content of the row.

Any string that is possibly derived from untrusted data and is inserted into an HTML document must be HTML-escaped using the HTML escape function introduced in Section 10.5.1.

<label for="UserName">User name</label> <input id="UserName" name="UserName" type="text" value="" />

The other type of tree data type provided by GLib is the n-ary tree, which allows a node to have any number of children. This data type is not balanced automatically; you perform management of its structure. N-ary trees are actually a collection of GNode structures. Each structure contains five objects. The first, data, is a pointer to the actual piece data stored by the node. As with most of the data types provided by GLib, you can store any type of pointer data type. typedef struct { gpointer data; GNode *next; GNode *prev; GNode *parent; GNode *children; } GNode; The other members point to other nodes within the tree. These include the next node on the same level, the previous node on the same level, the parent node, and the first child. To help you understand this relationship, Figure 6-1 shows a simple association.