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foreach (string s in Directory.GetFiles( PhotoAlbum.DefaultDir, "*.abm")) { // Create a node for this album String baseName = Path. GetFileNameWithoutExtension(s); TreeNode albumNode = new TreeNode(baseName, new TreeNode[] { new TreeNode("child") }); albumNode.Tag = s;

Note: We will use the Tag property to identify the album related to a specified node when handling events for the TreeView control.

defaultRoot.Nodes.Add(albumNode); } treeViewMain.EndUpdate(); }

get everyone together, and while most of the people had no ability to shoot, it didn t really matter A dollar on the line is worth the fun of breaking away and laughing as a team At Konami, our guys quickly switched this to producer baseball I, being inept at

9 10

Add the new node to the collection of nodes under the default root node. Allow the TreeView to repaint by calling the EndUpdate method.

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This code uses a few tricks to ensure that our application will perform as expected. When a new album node is created, a single child node is added to ensure that the TreeView control will allow the node to be expanded.

TreeNode albumNode = new TreeNode(baseName, new TreeNode[] { new TreeNode("child") });

in every day there is a moment when we all try to let loose and do something out of the ordinary When I was at EA, in the early days of my career, we would have shooting contests for money in the lobby with a Fisher-Price basketball hoop that

Without this child, the control would presume that our node has no children, and would not display a plus sign next to the album to permit the user to expand the node. We will make use of this in the next section, where we implement the expansion of an album node. This line simply ensures that the user can initiate this step. We also assign the Tag property for each node to contain the file path corresponding to the node. For the root node, this path is the default album directory. For each album, this path is the fully qualified album file name.

. . . defaultRoot.Tag = PhotoAlbum.DefaultDir; foreach (string s in Directory.GetFiles(. . .) { . . . albumNode.Tag = s; defaultRoot.Nodes.Add(albumNode); }

This setting will permit us to identify the object corresponding to a given node while processing a user action on behalf of the tree view. Like other Tag properties we have seen for .NET, this property can be set to any object instance. Notice as well that we use the default image index and selected image index for all album files. Since we do not open the corresponding PhotoAlbum during our initialization step, we have no way to know which albums can be opened and which will generate an error. We start by assuming that all albums can be opened, and will update the image index values if we discover any problems. It is also worth noting that using the Tag property as we do in the previous code is not always a practical solution. Another common tactic, especially in more complex applications, is to derive a new class from the TreeNode class, and use this new class to populate the tree. This alternate approach can encapsulate node-specific functionality in the derived class, and can improve the maintenance and readability of the resulting code. Compile and run your application to verify that the albums appear in the tree. Our next topic is the insertion of photographs when the user expands an album node. 15.3.3 CREATING THE PHOTOGRAPH NODES So far our TreeView control displays the albums from the default album directory during start-up. We created a default child node within each album to permit the user to expand these nodes. The next step is to handle this expansion and replace the default child node with the set of photos in the album. 501