Category Archives: extension methods

Convert between ragged arrays and two-dimensional arrays

Posted on July 10, 2018 by RodStephens

Ragged arrays are arrays that hold other arrays, as opposed to two-dimensional arrays. They are called “ragged arrays” because they work like two-dimensional arrays (or higher-dimensional arrays) where each row in the array can hold a different number of elements. … Continue reading →

Posted in algorithms, arrays, extension methods, generic | Tagged algorithms, arrays, C#, C# programming, example, example program, extension methods, generic, multi-dimensional arrays, ragged arrays, two-dimensional arrays, Windows Forms programming | Leave a comment

Save WriteableBitmap images in multiple formats in WPF and C#

Posted on May 30, 2018 by RodStephens

The post Easily save a WriteableBitmap in WPF and C# describes an extension method that makes it easy to save a WriteableBitmap object into a PNG file, but what if you want to save the image in some other format … Continue reading →

Posted in extension methods, graphics, image processing, wpf, XAML | Tagged C#, C# programming, example, example program, extension methods, graphics, image file formats, image formats, image processing, png, png file, save bitmap, save WriteableBitmap, SaveBitmap, Windows Forms programming, WPF, WriteableBitmap, XAML | 1 Comment

Easily save a WriteableBitmap in WPF and C#

Posted on May 29, 2018 by Rod Stephens

In my post Save bitmap files in WPF and C# I lamented (okay, whined about) the cumbersomeness of saving a WriteableBitmap into a file in WPF. Fortunately there’s a way you can make it easier. Simply add an extension method … Continue reading →

Posted in extension methods, graphics, image processing, wpf, XAML | Tagged C#, C# programming, example, example program, extension methods, graphics, image processing, png, png file, save bitmap, save WriteableBitmap, SaveBitmap, Windows Forms programming, WPF, WriteableBitmap, XAML | 1 Comment

Make extension methods that pick random items from arrays or lists in C#

Posted on April 30, 2018 by Rod Stephens

This example uses a simple but useful technique to let you pick random items from arrays and lists. The following code defines RandomElement extension methods that pick random items. public static class ArrayExtensions { // The random number generator. private … Continue reading →

Posted in arrays, extension methods, lists | Tagged arrays, C#, C# programming, example, example program, extension methods, lists, random, random items, Windows Forms programming | 1 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

Make subarray extension methods in C#

Posted on October 23, 2017 by Rod Stephens

The Array class’s Copy method can copy a subarray from one array to another, but it requires that you figure out how many items you want to copy. It will also copy parts of a two-dimensional array, but it only … Continue reading →

Posted in arrays, extension methods | Tagged array, arrays, C#, C# programming, copy array entries, example, example program, extension methods, subarray, Windows Forms programming | Leave a comment

Make extension methods to generate random double values in C#

Posted on July 5, 2017 by Rod Stephens

This example adds extension methods to the Random class to generate double values within a specified range. The Random class provides methods for generating pseudo-random numbers. The Next method has three overloaded versions that produce a non-negative integer, an integer … Continue reading →

Posted in extension methods, mathematics | Tagged C#, C# programming, example, example program, extension methods, mathematics, NextDouble, random, random class, random numbers, Windows Forms programming | 1 Comment

Print a ListView control’s contents on multiple pages in C#

Posted on June 30, 2017 by Rod Stephens

This example continues the following two examples: Print a ListView with large contents in C# Print the contents of a ListView control in C# Read those examples for an overview of the basic procedure. This example prints the contents of … Continue reading →

Posted in controls, extension methods, printing | Tagged C#, C# programming, controls, example, example program, extension methods, ListView, multi-line data, multiline data, print ListView, print ListView contents, print ListView data, printing, Windows Forms programming | 4 Comments

Make rectangle extension methods in C#

Posted on June 21, 2017 by Rod Stephens

This example shows how to add rectangle extension methods to the Rectangle and RectangleF structs. The Rectangle and RectangleF structs have several useful properties for determining their geometry such as Left, Right, Top, and Bottom, but they have no midpoint … Continue reading →

Posted in drawing, extension methods, graphics | Tagged C#, C# programming, center, drawing, example, example program, extension methods, graphics, midpoint, MidX, MidY, Rectangle, rectangle extension methods, RectangleF, Windows Forms programming | Leave a comment

Use string extension methods to validate Social Security numbers in C#

Posted on June 19, 2017 by Rod Stephens

This example defines three extension methods that return true if strings contain Social Security numbers. Recall that you must add extension methods to a static class and that the methods must be static. This example begins by defining a Matches … Continue reading →