Monthly Archives: May 2016

Find a matrix inverse in C#

Posted on May 27, 2016 by RodStephens

This example finds a matrix inverse for a square matrix. The inverse of a matrix is another matrix that, when multiplied by the first, gives the identity matrix as a result. In the identity matrix, all entries are 0 except … Continue reading →

Posted in Uncategorized | Tagged algorithms, C#, C# programming, example, example program, Gauss-Jordan Elimination, Gaussian elimination, inverse, invert, invert matrix, mathematics, matrices, Matrix, matrix inverse, Windows Forms programming | 2 Comments

Use the Conditional attribute to make a method non-callable in C#

Posted on May 26, 2016 by Rod Stephens

The Conditional attribute makes a method callable depending on whether a compile-time constant is defined. If the constant is not defined, then the compiler ignores calls to that method. The following code makes the Test subroutine callable if either the … Continue reading →

Posted in attributes, debugging | Tagged attributes, C#, C# programming, conditional, conditional attribute, debugging, example, example program, Windows Forms programming | Leave a comment

Draw smoother cones using WPF and C#

Posted on May 25, 2016 by RodStephens

The example Draw smooth cones using WPF and C# shows how to draw some fairly smooth cones in WPF and C#. This example shows how to make even smoother cones. In the picture on the right, the cone on the … Continue reading →

Posted in algorithms, drawing, graphics, mathematics, wpf, XAML | Tagged 3D, 3D graphics, algorithms, C#, C# programming, cones, draw cones, draw smooth cones, draw smoother cones, drawing, example, example program, geometry, graphics, mathematics, smooth cones, smoother cones, three-dmensional graphics, Windows Forms programming, WPF, XAML | Leave a comment

Draw smooth cones using WPF and C#

Posted on May 24, 2016 by RodStephens

The example Draw cones using WPF and C# shows how to draw cones in WPF and C#. This example shows how to draw smooth cones. Or at least smoother cones. To make smooth cones, the program simply ensures that adjacent … Continue reading →

Posted in algorithms, drawing, geometry, graphics, mathematics, wpf, XAML | Tagged 3D, 3D graphics, algorithms, C#, C# programming, cones, draw cones, draw smooth cones, drawing, example, example program, geometry, graphics, mathematics, smooth cones, three-dmensional graphics, Windows Forms programming, WPF, XAML | 1 Comment

Draw cones using WPF and C#

Posted on May 20, 2016 by RodStephens

This example shows how to draw cones in WPF and C#. The program uses a method very similar to the one used by the example Draw cylinders using WPF and C#. The picture on the right shows the approach used … Continue reading →

Posted in algorithms, drawing, geometry, graphics, mathematics, wpf, XAML | Tagged 3D, 3D graphics, 3D line segment, algorithms, arrows, axes, axis, boxes, C#, C# programming, cones, cross product, cube, cubes, draw arrows, draw cones, drawing, example, example program, geometry, graphics, line segment, mathematics, segment, three-dmensional graphics, tic mark, vector, Windows Forms programming, WPF, XAML | 1 Comment

Make a temperature forecast in C#

Posted on May 18, 2016 by RodStephens

The example Get weather forecast data in C# explains how to read weather forecast data from OpenWeatherMap. This example uses that data to list the forecast’s temperatures. The forecast data has (in part) the following structure. <weatherdata> … <forecast> <time … Continue reading →

Posted in internet, interoperability, web, XML | Tagged C#, C# programming, example, example program, internet, interoperability, temperature, temperature forecast, weather conditions, weather forecast, web, Windows Forms programming, XML | 5 Comments

Get weather forecast data in C#

Posted on May 16, 2016 by RodStephens

There are many sites that offer weather condition and weather forecast services. All of the ones I found required you to have a developer key, although most of them have a free membership that works for a simple program like … Continue reading →

Posted in internet, interoperability, web, XML | Tagged C#, C# programming, example, example program, internet, interoperability, weather conditions, weather forecast, web, Windows Forms programming, XML | 2 Comments

Graph historical stock prices in C#

Posted on May 14, 2016 by Rod Stephens

The key to this example is the GetStockPrices method shown in the following code. // Get the prices for this symbol. private List GetStockPrices(string symbol) { // Compose the URL. string url = “http://www.google.com/finance/” + “historical?output=csv&q=” + symbol; // Get … Continue reading →

Posted in finance, graphics, mathematics | Tagged C#, C# programming, example, example program, finance, graph, graph stock prrices, graphics, graphing, mathematics, stock market, stock prices, Windows Forms programming, Yahoo, Yahoo finance | Leave a comment

Give an application beautiful icons in C#

Posted on May 13, 2016 by Rod Stephens

This is a pretty long tutorial on how to build and use icons in an application. Contents Icon Sizes Creating an Icon File Using the Integrated Icon Editor Using External Icon Editors Inkscape @icon sushi Using an Icon File Clearing … Continue reading →

Posted in forms, graphics, system | Tagged C#, C# programming, example, example program, forms, graphics, system, Windows Forms programming | 1 Comment

Provide multiple inheritance in C#

Posted on May 12, 2016 by Rod Stephens

Sometimes you might want a class to inherit from more than one parent class. For example, you might define a Vehicle class that has vehicle properties such as MaxSpeed, and a Domicile class with house-like properties such as SquareFeet. You … Continue reading →