Tag Archives: TreeNode

Write a TreeView into a tab-delimited file in C#

Posted on January 8, 2018 by RodStephens

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 | Leave a comment

Initialize a TreeView control to display a directory hierarchy in C#

Posted on November 21, 2017 by Rod Stephens

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 →

Posted in controls, directories, extension methods, files, user interface | Tagged C#, C# programming, controls, directories, directory hierarchy, example, example program, extension methods, files, TreeNode, TreeView, TreeView control, user interface, Windows Forms programming | Leave a comment

Check a TreeView subtree in C#

Posted on May 1, 2017 by Rod Stephens

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 →

Posted in controls, user interface | Tagged C#, C# programming, check TreeView, controls, example, example program, subtree, TreeNode, TreeView, TreeView subtree, uncheck TreeView, user interface, Windows Forms programming | 5 Comments

Display context menus for TreeView items in C#

Posted on April 28, 2017 by Rod Stephens

This example displays different context menus when you right-click on different kinds of nodes in a TreeView control. In this example, different nodes represent factories, groups, or individuals. Different node types display different context menus. When it starts, the program … Continue reading →

Posted in controls, user interface | Tagged C#, C# programming, context menus, contextmenu, controls, example, example program, TreeNode, TreeView, user interface, Windows Forms programming | Leave a comment

Enumerate TreeView nodes in C#

Posted on April 27, 2017 by RodStephens

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 | Leave a comment

Yield checked TreeView nodes in C#

Posted on April 26, 2017 by RodStephens

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#

Posted on April 25, 2017 by RodStephens

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 →

Posted in algorithms, controls, recursion, user interface | Tagged algorithms, C#, C# programming, checked TreeView nodes, controls, example, example program, recursion, TreeNode, TreeNodeCollection, TreeView, TreeView nodes, user interface, Windows Forms programming | Leave a comment

Display a form’s control hierarchy in C#

Posted on March 25, 2017 by RodStephens

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 →

Posted in controls, forms | Tagged C#, C# programming, container controls, control containers, control hierarchy, controls, display control hierarchy, example, example program, forms, TreeNode, TreeView, Windows Forms programming | Leave a comment

Draw a scrolling family tree in C#

Posted on January 17, 2017 by RodStephens

The example Draw a family tree in C# shows how to draw a family tree. Unfortunately if the tree is too big, you can’t make the form big enough to display it all. One solution would be to use smaller … Continue reading →

Posted in algorithms, classes, generic, graphics, OOP | Tagged algorithms, AutoScroll, C#, C# programming, classes, example, example program, family tree, generic, generic classes, graphics, MouseDown, MouseMove, nodes containing pictures, OOP, PictureNode, scroll bars, scrolling family tree, tree containing pictures, TreeNode, trees, Windows Forms programming | 1 Comment

Draw trees vertically or horizontally in C#

Posted on August 22, 2016 by Rod Stephens

The example Handle generic TreeNode mouse events in C# shows how to build a generic node class that can draw trees with nodes that contain just about anything. In that example, each each node is centered over its subtree. This … Continue reading →