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Tag Archives: TreeNode
Make a random tree of generic TreeNode objects in C#
The example Handle generic TreeNode mouse events in C# explains how to build a tree where each node is represent by a TreeNode object. Each TreeNode contains its own object that determines how the node is drawn. This example the … Continue reading
Posted in classes, generic, OOP
Tagged C#, C# programming, classes, example, example program, generic, generic classes, OOP, random, random tree, TreeNode, trees, Windows Forms programming
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Write a TreeView into a tab-delimited file in C#
The example Load a TreeView from a tab-delimited file in C# shows how to load a TreeView control from a file. This example shows how to do the converse: write a TreeView control’s values into a file. The following SaveTreeViewIntoFile … Continue reading
Posted in algorithms, controls, files, recursion
Tagged algorithms, C#, C# programming, controls, example, example program, files, recursion, tabs, TreeNode, TreeView, Windows Forms programming
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Initialize a TreeView control to display a directory hierarchy in C#
This example adds the following LoadFromDirectory extension method to the TreeView control. // Initialize the TreeView from a directory, // its subdirectories, and their files. public static void LoadFromDirectory(this TreeView trv, string directory, int folder_img, int file_img) { DirectoryInfo dir_info … Continue reading
Check a TreeView subtree in C#
Sometimes it’s useful to let the user select a TreeView subtree by clicking on a higher-level node. Then the user can deselect individual nodes within the subtree if desired. For example, in the picture shown here I checked the Dinner … Continue reading
Enumerate TreeView nodes in C#
The previous two posts show two ways you can enumerate TreeView nodes that are checked. The idea is to recursively crawl over the tree’s nodes and pick out the checked ones. Unfortunately that method isn’t easily extendable. For example, if … Continue reading
Posted in algorithms, controls, recursion, user interface
Tagged algorithms, C#, C# programming, checked TreeView nodes, controls, example, example program, recursion, recursively, TreeNode, TreeNodeCollection, TreeView, TreeView nodes, user interface, Windows Forms programming, yield, yield return
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Yield checked TreeView nodes in C#
The previous example used recursion to traverse the nodes in a TreeView control and fill a list with the nodes that are checked. This example uses a slightly different approach. It traverses the TreeView control’s nodes and uses the yield … Continue reading
Make a list of checked TreeView nodes in C#
If you set a TreeView control’s CheckBoxes property to true, then the control displays boxes that the user can check to select nodes. In that case you will probably need to find the checked TreeView nodes at some point. Strangely … Continue reading
Display a form’s control hierarchy in C#
This example displays the control hierarchy for a form. It’s actually relatively simple. Some controls can contain other controls. For example, a form is a control and it contains all of a Windows Forms application’s controls. Similarly Panel, TableLayoutPanel, SplitContainer, … Continue reading