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Gets the first child node contained by this node. Gets or sets an index into the tree s image list of the default image to display for this node. Gets the position of this node within the Nodes collection of the containing TreeView or TreeNode. Gets whether this node is currently being edited. Gets whether the children of this node are currently displayed. Gets whether this node is currently selected. Gets whether this node is currently visible in the containing tree view. Gets the first subsequent child, sibling, or other node visible in the containing tree view control. Gets or sets the Font used to display the label text for this node. Gets the collection of TreeNode objects assigned to this node. Gets the TreeNode object containing this node, if any. Gets the previous tree node in the Nodes collection containing this node. Gets or sets an index into the tree s image list of the image to display by this node when the node is selected. Gets or sets an object to associate with this tree node. Gets or sets the text displayed in the label for this node. Initiates an edit of this node s label. Ensures that no children of this node are currently displayed. Expands all tree nodes contained by this node. Toggles the tree node between the expanded or collapsed state, based on the IsExpanded setting.

At this point, you might be asking yourself the following question Given that the same functionality found in the generic Gen class can be achieved without generics, by simply specifying object as the data type and employing the proper casts, what is the benefit of making Gen generic The answer is that generics automatically ensure the type safety of all operations involving Gen In the process, generics eliminate the need for you to use casts and type-check code by hand To understand the benefits of generics, first consider the following program that creates a non-generic equivalent of Gen:

In our tree view for the MyAlbumExplorer application, we would like to represent each album as a node in the tree, with each album containing a node for each photograph in that album. Since albums can appear in any directory, we might also wish to indicate where a set of albums is located. We will do this by generating a tree structure similar to the one shown in figure 15.6. This tree was generated in Visual Studio to illustrate the hierarchy we will employ. The ListView control in this figure is totally unrelated to the contents of our tree. This is not what we ultimately want, but it is okay for now.

// NonGen is functionally equivalent to Gen but does not use generics using System; class NonGen { object ob; // ob is now of type object // Pass the constructor a reference of type object public NonGen(object o) {

Part I:

Figure 15.6 In the TreeView, note how the selected album employs a different icon than the unselected one

ob = o; } // Return type object public object GetOb() { return ob; } // Show type of ob public void ShowType() { ConsoleWriteLine("Type of ob is " + obGetType()); } } // Demonstrate the non-generic class class NonGenDemo { static void Main() { NonGen iOb; // Create NonGen object iOb = new NonGen(102); // Show the type of data stored in iOb iObShowType(); // Get the value in iOb // This time, a cast is necessary int v = (int) iObGetOb(); ConsoleWriteLine("value: " + v); ConsoleWriteLine(); // Create another NonGen object and store a string in it NonGen strOb = new NonGen("Non-Generics Test"); // Show the type of data stored in strOb strObShowType(); // Get the value of strOb // Again, notice that a cast is necessary String str = (string) strObGetOb(); ConsoleWriteLine("value: " + str); // This compiles, but is conceptually wrong! iOb = strOb; // The following line results in a runtime exception // v = (int) iObGetOb(); // runtime error! } }

Web site: calcarsorg Contact: Felix Kramer <info@calcarsorg> (650) 520-5555 Mailing: PO Box 61045, Palo Alto, CA 94306

As an introduction to tree nodes, let s create the structure shown in figure 15.6 in Visual Studio .NET. The following table details the steps required.

This program produces the following output:

Type of ob is SystemInt32 value: 102

CREATE TREE NODES IN VISUAL STUDIO Action 1 In the MainForm.cs [Design] window, set the ImageList property of the tree view to use the existing imageListSmall component already associated with the form. Set default index values for nodes in the tree.

18:

CREATE TREE NODES IN VISUAL STUDIO (continued) Action 3 Display the TreeNode Editor dialog box for the control.