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Monthly Archives: April 2017
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 tooltips for TreeView nodes in C#
At design time, I added a TreeView control to the form. I also added an associated ImageList control to hold images for the TreeView control’s nodes, and I set the TreeView control’s ImageList property to the ImageList control. Finally I … Continue reading
Posted in controls, user interface
Tagged C#, C# programming, controls, example, example program, GetNodeAt, mouse position, recursion, recursive, tool tips, tooltips, TreeView, user interface, Windows Forms programming
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Compare sorting algorithms in C#, article 5 of 5
Countingsort The discussion of Quicksort in my previous post mentions that the fastest possible sorting algorithms that use comparisons take on the order of N * log(N) steps. Countingsort does not use comparisons so it is not bound by that … Continue reading
Compare sorting algorithms in C#, part 4 of 5
Quicksort Quicksort is a recursive algorithm that uses a divide-and-conquer technique. While the list of items to be sorted contains at least two items, Quicksort divides it into two sublists and recursively calls itself to sort the sublists. The Quicksort … Continue reading
Posted in algorithms, performance
Tagged algorithms, Array.Sort, bubblesort, C#, C# programming, countingsort, example, example program, quicksort, selectionsort, sort arrays, sort values, sorting, Windows Forms programming
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Compare sorting algorithms in C#, part 3 of 5
Selectionsort Selectionsort is a very simple algorithm. First you search the list for the smallest item. Then you swap that item with the item at the top of the list. Next you find the second smallest item and swap it … Continue reading
Compare sorting algorithms in C#, part 2 of 5
Bubblesort Bubblesort is a specialized algorithm designed for sorting items that are already mostly in sorted order. If only one or two items in your list are out of order, Bubblesort is very fast. If the items in your list … Continue reading
Compare sorting algorithms in C#, post 1 of 5
This post begins a series of articles about sorting algorithms. Much of the text originally appeared in the December 1995 issue of Visual Basic Developer magazine, a publication that seems to no longer exist. All of these posts include the … Continue reading