Tag Archives: example program

Search files for target text in C#

Posted on August 13, 2018 by RodStephens

The .NET tools available in the System.IO namespace and normal string methods make it easy to search files for target text. When you click the Search button, the following code displays the lines in a file that contain a particular … Continue reading →

Posted in files | Tagged C#, C# programming, example, example program, files, find lines in files, search files, Windows Forms programming | Leave a comment

Write Console window output to multiple places in C#

Posted on August 9, 2018 by RodStephens

This example captures output sent to the Console window and displays it in multiple controls plus the Console window. It is based on an excellent reply by user Servy on Stack Overflow. The following class is a TextWriter that represents … Continue reading →

Posted in Uncategorized | Tagged C#, C# programming, console, Console output, Console window, example, example program, TextWriter, Windows Forms programming | Leave a comment

Redirect Console window output to a TextBox in C#

Posted on August 7, 2018 by RodStephens

This example captures output sent to the Console window and displays it in a TextBox control. It is based on an excellent reply by user Servy on Stack Overflow. The Console object has a SetOut method that lets you change … Continue reading →

Posted in console | Tagged C#, C# programming, console, Console output, Console window, example, example program, TextWriter, Windows Forms programming | 1 Comment

Get a weather forecast from openweathermap.org in C#

Posted on July 30, 2018 by RodStephens

This example displays a weather forecast from openweathermap.org. To get a forecast or other data, you build a URL describing your request and navigate to it. You then parse the returned XML or JSON data to see what openweathermap.org has … Continue reading →

Posted in internet, web, XML | Tagged C#, C# programming, example, example program, forecasts, internet, JSON, weather, weather forecast, web, Windows Forms programming, XML | Leave a comment

Draw rose curves in C#

Posted on July 27, 2018 by RodStephens

A rose curve is a curve generated by the polar coordinate equation r = cos(n / d * θ). Here n and d should be relatively prime, so the fraction n / d cannot be simplified. When you click the … Continue reading →

Posted in algorithms, drawing, graphics, mathematics | Tagged algorithms, C#, C# programming, drawing, example, example program, graphics. mathematics, rose curves, Windows Forms programming | Leave a comment

Find two sets where the median of one is the mean of the other and vice versa in C#

Posted on July 23, 2018 by RodStephens

For an upcoming book, I wanted to find sets where the mean (average) of one is the median (middle value) of the other and vice versa. I wanted to avoid trivial examples such as {1, 1, 1} and where the … Continue reading →

Posted in algorithms, combinatorics | Tagged algorithms, C#, C# programming, combinatorics, example, example program, mean, median, sets, statistics, Windows Forms programming | Leave a comment

Trim images in C#

Posted on July 19, 2018 by RodStephens

This example shows how you can trim images to remove unnecessary whitespace around their edges. Sometimes when I make pictures for a book, it’s hard to tell where the edges of the picture begin, so I risk either including more … Continue reading →

Posted in Uncategorized | Tagged Bitmap32, C#, C# programming, example, example program, graphics, image processing, trim images, Windows Forms programming | Leave a comment

Find Mersenne primes in C#

Posted on July 16, 2018 by RodStephens

Mersenne primes are prime numbers of the from 2n – 1 for some integer n. For example, 22 – 1 = 4 – 1 = 3 and 3 is prime, so 3 is a Mersenne prime. This example uses a … Continue reading →

Posted in algorithms, mathematics | Tagged algorithms, C#, C# programming, example, example program, mathematics, Mersenne primes, prime numbers, primes, Windows Forms programming | Leave a comment

Display a progress bar with text in WPF and C#

Posted on July 12, 2018 by RodStephens

As is so often the case in WPF, the solution is simple after you spend a few hours figuring out what controls to use. This example uses a normal Grid control that holds a StackPanel. The following code shows the … Continue reading →

Posted in controls, user interface, wpf, XAML | Tagged C#, C# programming, controls, example, example program, progress, progress bar, ProgressBar, show progress, status, user interface, Windows Forms programming, WPF, XAML | 1 Comment

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 →