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Csharp Articles
Page 6 of 196
How to update the value stored in a Dictionary in C#?
In C#, Dictionary is a generic collection which is generally used to store key/value pairs. In Dictionary, the key cannot be null, but value can be. A key must be unique. Duplicate keys are not allowed if we try to use duplicate key then compiler will throw an exception.As mentioned above a value in a dictionary can be updated by using its key as the key is unique for every value.myDictionary[myKey] = myNewValue;ExampleLet’s take a dictionary of students having id and name. Now if we want to change the name of the student having id 2 from "Mrk" to "Mark".using ...
Read MoreWhat is the difference between Foreach and Parallel.Foreach in C#?
Foreach loop in C# runs upon a single thread and processing takes place sequentially one by one. Whereas Parallel.Foreach loop in C# runs upon multiple threads and processing takes place in a parallel way. Which means it is looping through all items at once without waiting for the previous item to complete.The execution of Parallel.Foreach is faster than normal ForEach. To use Parallel.ForEach loop we need to import System.Threading.Tasks namespace.Exampleusing System; using System.Collections.Generic; using System.Diagnostics; using System.Threading; using System.Threading.Tasks; namespace DemoApplication{ class Demo{ static void Main(string[] args){ var animals = new List{ ...
Read MoreHow to create Guid value in C#?
A Globally Unique Identifier or GUID represents a gigantic identification number — a number so large that it is mathematically guaranteed to be unique not only in a single system like a database, but across multiple systems or distributed applications.The total number of unique keys (3.40282366×1038) is so large that the probability of the same number being generated twice is very small. For an application using 10 billion random GUIDs, the probability of a coincidence is approximately 1 in a quintillion.(1030)For example, in Retail domain if we want to generate a unique for each transaction so that a customer can ...
Read MoreHow to implement a Singleton design pattern in C#?
Singleton Pattern belongs to Creational type patternSingleton design pattern is used when we need to ensure that only one object of a particular class is Instantiated. That single instance created is responsible to coordinate actions across the application.As part of the Implementation guidelines we need to ensure that only one instance of the class exists by declaring all constructors of the class to be private. Also, to control the singleton access we need to provide a static property that returns a single instance of the object.ExampleSealed ensures the class being inherited and object instantiation is restricted in the derived classPrivate ...
Read MoreWhat is typeof, GetType or is in C#?
Typeof()The type takes the Type and returns the Type of the argument.GetType()The GetType() method of array class in C# gets the Type of the current instance.isThe "is" keyword is used to check if an object can be casted to a specific type. The return type of the operation is Boolean.Exampleclass Demo { } class Program { static void Main() { var demo = new Demo(); Console.WriteLine($"typeof { typeof(Demo)}"); Type tp = demo.GetType(); Console.WriteLine($"GetType {tp}"); if (demo is Demo) { System.Console.WriteLine($"is ...
Read MoreHow do you do a deep copy of an object in .NET?
Deep copies duplicate everything. A deep copy of a collection is two collections with all of the elements in the original collection duplicatedDeep Copy is used to make a complete deep copy of the internal reference types.In another words a deep copy occurs when an object is copied along with the objects to which it refersExampleclass DeepCopy { public int a = 10; } class Program { static void Main() { //Deep Copy DeepCopy d = new DeepCopy(); d.a = 10; DeepCopy d1 = new DeepCopy(); d1.a = d.a; Console.WriteLine("{0} {1}", d1.a, d.a); // 10,10 d1.a = 5; Console.WriteLine("{0} {1}", d1.a, d.a); //5,10 Console.ReadLine(); } }Output10 10 5 10
Read MoreHow to check if a number is a power of 2 in C#?
A power of 2 is a number of the form 2n where n is an integerThe result of exponentiation with number two as the base and integer n as the exponent.n2n01122438416532Example 1class Program { static void Main() { Console.WriteLine(IsPowerOfTwo(9223372036854775809)); Console.WriteLine(IsPowerOfTwo(4)); Console.ReadLine(); } static bool IsPowerOfTwo(ulong x) { return x > 0 && (x & (x - 1)) == 0; } }OutputFalse TrueExample 2class Program { static void Main() { Console.WriteLine(IsPowerOfTwo(9223372036854775809)); Console.WriteLine(IsPowerOfTwo(4)); Console.ReadLine(); } static bool IsPowerOfTwo(ulong n) { if (n == 0) return false; while (n != 1) { if (n % 2 != 0) return false; n = n / 2; } return true; } }OutputFalse True
Read MoreHow to convert C# DateTime to “YYYYMMDDHHMMSS” format?
Convert the dateTime to toString that results in converting the DateTime to “YYYYMMDDHHMMSS” formatThere are also other formats that the dateTime can be convertedMM/dd/yyyy 08/22/2020dddd, dd MMMM yyyy Tuesday, 22 August 2020dddd, dd MMMM yyyy HH:mm Tuesday, 22 August 2020 06:30dddd, dd MMMM yyyy hh:mm tt Tuesday, 22 August 2020 06:30 AMdddd, dd MMMM yyyy H:mm Tuesday, 22 August 2020 6:30dddd, dd MMMM yyyy h:mm tt Tuesday, 22 August 2020 6:30 AMdddd, dd MMMM yyyy HH:mm:ss Tuesday, 22 August 2020 06:30:07MM/dd/yyyy HH:mm 08/22/2020 06:30MM/dd/yyyy hh:mm tt 08/22/2020 06:30 AMMM/dd/yyyy H:mm 08/22/2020 6:30MM/dd/yyyy h:mm tt 08/22/2020 6:30 AMMM/dd/yyyy HH:mm:ss 08/22/2020 06:30:07Exampleclass ...
Read MoreWhat is the difference between Func delegate and Action delegate in C#?
A delegate is a type that represents references to methods with a particular parameter list and return type. When we instantiate a delegate, we can associate its instance with any method with a compatible signature and return type. We can invoke (or call) the method through the delegate instance.Func DelegateFunc is a generic delegate included in the System namespace. It has zero or more input parameters and one out parameter. The last parameter is considered as an out parameter. This delegate can point to a method that takes up to 16 Parameters and returns a value.Below is the Func delegate ...
Read MoreHow to convert byte array to an object stream in C#?
Stream is the abstract base class of all streams and it Provides a generic view of a sequence of bytes. The Streams Object involve three fundamental operations such as Reading, Writing and Seeking. A stream be can be reset which leads to performance improvements.A byte array can be converted to a memory stream using MemoryStream Class.MemoryStream stream = new MemoryStream(byteArray);ExampleLet us consider a byte array with 5 values 1, 2, 3, 4, 5.using System; using System.IO; namespace DemoApplication { class Program { static void Main(string[] args) { byte[] byteArray = new byte[5] ...
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