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How to use delegates and event handlers in C#

How to use delegates and event handlers in C# requires specific code examples. In C#, delegates and event handlers are two very important concepts that can be used to implement event-driven programming models. Delegates provide a mechanism for passing methods as parameters, while event handlers are used to handle methods for specific events. This article will introduce in detail how to use delegates and event handlers in C#, and give specific code examples. First, we need to understand what delegation is. A delegate can be viewed as a reference to a method, which can be used to store specific

Oct 08, 2023 am 08:17 AM

委托 (Delegate)事件处理程序 (Event Handler)C# 中的事件 (Events in C#)

What is the basic structure of a C# program?

Let us first look at a C# sample program - usingSystem;namespaceDemoApplication{ classHelloWorld{ staticvoidMain(string[]args){ Console.WriteLine("Welcome!"); &am

Sep 27, 2023 pm 04:33 PM

How to pass command line parameters in the main method of C#?

The Main() method is the entry point - staticvoidMain(string[]args) The parameter array args is used to set the parameters - string[]args) If you add two parameters, it will set the following - varargs=newstring[]{"arg1", "arg2"}Here is the demo code - example usingSystem;namespaceDemo{ classHelloWorld{ //

Sep 25, 2023 pm 11:41 PM

C# program for searching directories and listing files

Searching directories and listing files are common tasks in many applications. In C#, we can use the Directory and File classes provided by the System.IO namespace to perform these tasks. In this article, we will explore how to write a C# program to search directories and list files. Method: Using Directory.GetFiles() The easiest way to search a directory and list files in C# is to use the Directory.GetFiles() method. This method returns an array of strings representing the paths to all files in the specified directory that match the specified search pattern. This is how we can list all files in a directory using Directory.GetFiles() method

Sep 24, 2023 pm 05:33 PM

c# add spaces between words starting with capital letters

To put spaces between words starting with a capital letter, try the following example - first, set up a string. varstr="WelcomeToMyWebsite";As you can see above, our string has no spaces before capital letters. To add it, use LINQ like this - str=string.Concat(str.Select(x=>Char.IsUpper(x)?""+x:x.ToString())).TrimStart('') ;The following puts spaces between words starting with a capital letter

Sep 24, 2023 pm 02:29 PM

How to write retry logic in C#?

Whenever an operation fails, retry logic is implemented. Implement retries to only log logic in the full context of the failed operation. It is important to log all connection failures that result in retries so that underlying issues with the application, service, or resource can be identified. Example classProgram{ publicstaticvoidMain(){ HttpClientclient=newHttpClient(); dynamicres=null;&

Sep 24, 2023 pm 12:45 PM

How to create an array with non-default repeating values in C#?

We can use Enumerable.Repeat() to create an array with non-default values. It repeats a collection containing repeated elements in C#. First, set which element you want to repeat how many times. Example 1classProgram{ staticvoidMain(string[]args){ varvalues=Enumerable.Repeat(10,5); foreach(varitem

Sep 23, 2023 pm 10:45 PM

What operators does C# provide to handle null values?

C# has the following three operators to handle null values - The null coalescing operator (??) allows you to get the value of a variable if it is not null, or specify a default value that can be used. It replaces the following expression in C# - stringresultOne=value!=null?value:"default_value"; with the following expression - stringresultTwo=value??"default_value"; Here is an example illustrating this. Example usingSystem;classProgram{ s

Sep 23, 2023 pm 05:57 PM

Looping techniques in C#

Loop statements allow us to execute a statement or a group of statements multiple times. The following are the loops supported by C# - Sr.No. Loop types and descriptions 1while loop When a given condition is true, it repeats a statement or a group of statements. It tests the condition before executing the loop body. 2for loop It executes a series of statements multiple times and abbreviates the code that manages the loop variables. 3do...while loop It is similar to the while statement, except that it tests the condition at the end of the loop body. Using C#, you can also use a foreach loop as shown below - example usingSystem;usingSystem.Collections;classDemo{ &n

Sep 23, 2023 pm 03:41 PM

C# OfType() method

Filter the collection based on each element type. Suppose you have the following list containing integer and string elements - list.Add("Katie"); list.Add(100); list.Add(200); Filter the collection and get only the elements of string type. varmyStr=fromainlist.OfType()selecta; works the same way for integer types. varmyInt=fromainlist.OfType()selecta;The following is the complete code-example real-time demonstration usingSystem;usi

Sep 23, 2023 pm 01:41 PM

How to truncate a file in C#?

To truncate a file in C#, use the FileStream.SetLength method. The following is the syntax - publicoverridevoidSetLength(longvalue); here, int64 = the length value of the stream

Sep 23, 2023 pm 12:21 PM

How to determine if a string contains all unique characters using C#?

To determine if a string has unique characters, first check that the word in the string matches the next word - for(intj=i+1;jSep 23, 2023 am 11:17 AM

C# program to add two time spans

First, set up two TimeSpans - TimeSpant1=TimeSpan.FromMinutes(1); TimeSpant2=TimeSpan.FromMinutes(2); To add it, use the Add() method - TimeSpanres=t1.Add(t2); Example UsingSystem; usingSystem. Linq;publicclassDemo{ publicstaticvoidMain(){ TimeS

Sep 23, 2023 am 10:05 AM

C# program to sort a list of string names using the LINQ OrderBy() method

Sorting a list of string names is a common task in programming, and the LINQOrderBy() method in C# provides a simple and efficient way to perform this operation. In this article, we will walk you through a C# program to sort a list of string names using the LINQOrderBy() method. What is the LINQOrderBy() method? The LINQOrderBy() method is used to sort the elements in a sequence in ascending or descending order based on one or more keys. Keys can be simple properties or complex expressions that return a value based on one or more properties of the objects in the sequence. Syntax of OrderBy() method publicstaticIO

Sep 22, 2023 pm 11:57 PM