Tag Archives: LINQ

Use LINQ with an embedded lambda expression to find prime numbers in C# (Part 3 of 3)

Posted on April 2, 2018 by Rod Stephens

The example Use more efficient LINQ to find prime numbers in C# (Part 2 of 3) uses a LINQ query to find prime numbers. It creates a delegate variable named IsOddPrime referring to a lambda expression and uses it to … Continue reading →

Posted in algorithms, LINQ, mathematics | Tagged algorithms, C#, C# programming, example, example program, find prime numbers, lambda expression, LINQ, mathematics, prime numbers, Windows Forms programming | 4 Comments

Use more efficient LINQ to find prime numbers in C# (Part 2 of 3)

Posted on March 31, 2018 by Rod Stephens

The previous post showed how you can use LINQ to find prime numbers. For every number between 1 and a maximum, the LINQ query called the IsPrime method to see if the number should be part of the selection. That … Continue reading →

Use LINQ to find prime numbers in C# (Part 1 of 3)

Posted on March 30, 2018 by Rod Stephens

This example uses LINQ to find prime numbers between 1 and a maximum value that you enter. It defines the following IsPrime method to determine whether a number is prime. // Return true if the number is prime. private bool … Continue reading →

Posted in algorithms, LINQ, mathematics | Tagged algorithms, C#, C# programming, example, example program, find prime numbers, LINQ, mathematics, prime numbers, Windows Forms programming | 1 Comment

Use LINQ to select words of certain lengths from a file in C#

Posted on February 16, 2017 by Rod Stephens

This example uses LINQ to read a file, remove unwanted characters, select words of a specified length, and save the result in a new file. Recently I needed a big word list so I searched around for public domain dictionaries. … Continue reading →

Posted in algorithms, files, LINQ | Tagged algorithms, C#, C# programming, dictionary, example, example program, files, LINQ, select words, Windows Forms programming, word list, WriteAllLines | 2 Comments

Sort words by letter count in C#

Posted on October 20, 2016 by Rod Stephens

This example sorts words by letter count. It counts the number of distinct letters in a list of words and displays the words and their counts sorted by the counts. The program is remarkably simple. The following code shows how … Continue reading →

Posted in algorithms, LINQ, mathematics | Tagged algorithms, C#, C# programming, count distinct letters, count letters, distinct letters, example, example program, letters in words, LINQ, mathematics, Windows Forms programming | Leave a comment

Convert latitudes and longitudes into distances on the globe in C#

Posted on September 17, 2016 by Rod Stephens

This example shows how you can convert latitudes and longitudes into distances on the globe. The formulas for performing those calculations is interesting but the program is also interesting for the ways it uses LINQ. The program stores information about … Continue reading →

Posted in algorithms, LINQ, mathematics | Tagged algorithms, C#, C# programming, calculate distances, distances, example, example program, Haversine, latitudes, LINQ, longitudes, mathematics, Windows Forms programming | 1 Comment

List colors in WPF and C#

Posted on October 30, 2015 by RodStephens

This example shows how to list colors and display color samples in a WPF ListBox. To build the list, the example demonstrates reflection, LINQ, and XAML data templates. The program uses the following XAML code to define the ListBox that … Continue reading →

Posted in drawing, enums, graphics, LINQ, reflection, wpf, XAML | Tagged brushes, C#, C# programming, color names, color samples, colors, DataTemplate, drawing, enumerations, enums, example, example program, graphics, ItemTemplate, LINQ, list color names, list colors, ListBox, reflection, SolidColorBrush, Windows Forms programming, WPF, XAML | Leave a comment

List unique words in a text file in C#

Posted on January 5, 2015 by Rod Stephens

This example uses regular expressions and LINQ to list the unique words contained in a text file in C#. When you enter the name of a file and click List Words, the following code executes. // List the words in … Continue reading →

Posted in files, LINQ, regular expressions | Tagged C#, C# programming, count words, example, example program, files, find words, LINQ, regular expressions, unique words, Windows Forms programming | 1 Comment

Compare LINQ speeds for different approaches in C#

Posted on November 26, 2014 by RodStephens

This example compares LINQ speeds while using LINQ in various ways. To find the minimum and maximum X values in a List<Point>, the example Use LINQ to find a bounding box for a list of PointF in C# defines a … Continue reading →

Posted in LINQ, performance | Tagged C#, C# programming, example, example program, LINQ, performance, speed, Windows Forms programming | Leave a comment

Use LINQ to find a bounding box for a list of PointF in C#

Posted on November 26, 2014 by Rod Stephens

This example shows how to use LINQ to find a bounding box for a list of PointF. When you click on the program’s PictureBox, it adds points to the list and shows the bounding box. The following method finds the … Continue reading →