Tips and tricks in C# .NET
September 11, 2017 Leave a comment
In this post we saw how to retrieve all logical drives using Windows Management Instrumentation – WMI -, and here how to find all network adapters.
Say you’d like to get a list of all Windows Services and their properties running on the local – “root” – machine, i.e. read the services listed here:
The following code will find all non-null properties of all Windows services found:
September 7, 2017 1 Comment
Say you have the following two sequences:
string[] first = new string[] {"hello", "hi", "good evening", "good day", "good morning", "goodbye" };
string[] second = new string[] {"whatsup", "how are you", "hello", "bye", "hi"};
If you’d like to find the common elements in the two arrays and put them to another sequence then it’s very easy with the Intersect operator:
IEnumerable<string> intersect = first.Intersect(second);
foreach (string value in intersect)
{
Console.WriteLine(value);
}
The ‘intersect’ variable will include “hello” and “hi” as they are common elements to both arrays.
September 6, 2017 Leave a comment
Say you have two sequences of objects:
string[] bands = { "ACDC", "Queen", "Aerosmith", "Iron Maiden", "Megadeth", "Metallica", "Cream", "Oasis", "Abba", "Blur", "Chic", "Eurythmics", "Genesis", "INXS", "Midnight Oil", "Kent", "Madness", "Manic Street Preachers" , "Noir Desir", "The Offspring", "Pink Floyd", "Rammstein", "Red Hot Chili Peppers", "Tears for Fears" , "Deep Purple", "KISS"};
string[] bandsTwo = { "ACDC", "Queen", "Aerosmith", "Iron Maiden", "Megadeth", "Metallica", "Cream", "Oasis", "Abba", "Blur", "Chic", "Eurythmics", "Genesis", "INXS", "Midnight Oil", "Kent", "Madness", "Manic Street Preachers" , "Noir Desir", "The Offspring", "Pink Floyd", "Rammstein", "Red Hot Chili Peppers", "Tears for Fears" , "Deep Purple", "KISS"};
If you’d like to check whether the two sequences include the same elements then you can use the SequenceEquals LINQ operator:
September 5, 2017 Leave a comment
Say you have two sequences of the same object type:
string[] first = new string[] {"hello", "hi", "good evening", "good day", "good morning", "goodbye" };
string[] second = new string[] {"whatsup", "how are you", "hello", "bye", "hi"};
You’d then like to join the two sequences containing the values from both but filtering out duplicates. Here’s how to achieve that with the first prototype of the LINQ Union operator:
September 1, 2017 Leave a comment
Two HashSet objects in C# are equal if they contain the same values regardless of their order in the collection.
Consider the following integer sets:
HashSet<int> intHashSetOne = new HashSet<int>()
{
1,2,6,5,7,5
};
HashSet<int> intHashSetTwo = new HashSet<int>()
{
2,2,8,5,9,4
};
HashSet<int> intHashSetThree = new HashSet<int>()
{
6,7,5,5,2,1
};
August 30, 2017 Leave a comment
In this post we saw how to determine if two arrays are structurally equal in .NET. Two arrays are said to be structurally equal if they contain the same elements in the same order.
Structural equality has a comparison counterpart: IStructuralComparable. It determines if an array comes before or after or is equal to another array based on the elements within it.
August 29, 2017 Leave a comment
There are times when you need to return a large text from a web service. The large text will then need to be handled by the recipient. In order to reduce the size of the message you can combine two simple techniques:
You will be able to send the base 64 encoded compressed string over the wire.
August 24, 2017 1 Comment
Say you have a method which accepts a string parameter. The method may need to handle null values in some way. One strategy is to validate the parameter and throw an exception:
private static string Resolve(string input)
{
if (input == null) throw new ArgumentNullException("Input");
.
.
.
}
Another strategy is to provide some default value with an if-else statement:
August 17, 2017 Leave a comment
Every programmer loves working with dates and time, right? Whether or not you like it it is inevitable to show the dates in a format that the viewer understands. You should not show dates presented according to the US format in Japan and vice versa.
The DateTimeFormatInfo class includes a range of useful properties to localise date and time. The entry point to the DateTimeFormatInfo class is CultureInfo. E.g. if you’d like to format a date according to various cultures – Swedish, Hungarian and German – then you can do it as follows:
August 16, 2017 Leave a comment
Suppose that we have an object with a collection of other objects, like a customer with order items. Then we can also have a sequence of customers where each customer will have her own list of orders. It happens that we want to analyse all orders regardless of the customer, like how many of product A have been sold. There are several options to collect all orders from all customers and place them into one unified collection for further analysis.
The C# SelectMany operator has been specifically designed to extract collections of objects and flatten those collections into one. This post will provide a couple of examples to demonstrate its usage.
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