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Csharp Articles
Page 90 of 196
How to check if String is Palindrome using C#?
Let’s say we need to find that the following string is Palindrome or not −str = "Level";For that, convert the string into character array to chec each character −char[] ch = str.ToCharArray();Now find the reverse −Array.Reverse(ch);Use the Equals method to find whether the reverse is equal to original array or not −bool res = str.Equals(rev, StringComparison.OrdinalIgnoreCase);The following is the complete code −Exampleusing System; namespace Demo { class Program { static void Main(string[] args) { string str, rev; str = "Level"; char[] ch = ...
Read MoreLinkedList in C#
System.Collections.Generic namespace is available in C# for LinkedList. The LinkedList class allows insertion and deletion of elements from the list at a fast pace.C# LinkedList class uses the concept of linked list. It allows us to insert and delete elements fastly. It can have duplicate elements. It is found in System.Collections.Generic namespace.Here is an example −Exampleusing System; using System.Collections.Generic; class Demo { static void Main() { LinkedList < string > l = new LinkedList < string > (); l.AddLast("one"); l.AddLast("two"); l.AddLast("three"); foreach(var ele in l) { Console.WriteLine(ele); } } }Outputone two three
Read MoreSemaphore in C#
The semaphore class lets you set a limit on the number of threads that have access to a critical section. The class is used to control access to a pool of resources. System.Threading.Semaphore is the namespace for Semaphore because it has all the methods and properties required to implement Semaphore.For using a semaphore in C#, you just need to instantiate an instance of a Semaphore object. It has minimum of two arguments −Reference−MSDNSr.No.Constructor & Description1Semaphore(Int32, Int32)Initializes a new instance of the Semaphore class, specifying the initial number of entries and the maximum number of concurrent entries.2Semaphore(Int32, Int32, String) −Initializes a ...
Read MoreMain thread vs child thread in C#
Main ThreadThe first thread to be executed in a process is called the main thread. When a C# program starts execution, the main thread is automatically created.Child ThreadThe threads created using the Thread class are called the child threads of the main thread.Here is an example showing how to create a main and child thread −Exampleusing System; using System.Threading; namespace Demo { class Program { static void Main(string[] args) { Thread th = Thread.CurrentThread; th.Name = "MainThread"; Console.WriteLine("This is {0}", th.Name); Console.ReadKey(); } } }OutputThis is MainThread
Read MoreHow to initialize a dictionary to an empty dictionary in C#?
To initialize a dictionary to an empty dictionary, use the Clear() method. It clears the dictionary and forms it as empty.dict.Clear();After that, use the Dictionary count property to check whether the list is empty or not −if (dict.Count == 0) { Console.WriteLine("Dictionary is empty!"); }Let us see the complete code −Exampleusing System; using System.Collections.Generic; using System.Linq; namespace Demo { public class Program { public static void Main(string[] args) { var dict = new Dictionary < string, string > (); dict.Clear(); if (dict.Count == 0) { Console.WriteLine("Dictionary is empty!"); } } } }OutputDictionary is empty!
Read MoreHow to input multiple values from user in one line in C#?
Use a while loop to input multiple values from the user in one line.Let’s say you need to get the elements of a matrix. Get it using Console.ReadLine() as shown below −Console.Write("Enter elements - Matrix 1 : "); for (i = 0; i < m; i++) { for (j = 0; j < n; j++) { arr1[i, j] = Convert.ToInt16(Console.ReadLine()); } }The following is an example showing how we can input multiple values from user −Exampleusing System; namespace Demo { public class Program { public static void Main(string[] args) { ...
Read MoreHow to instantiate a class in C#?
Use the new operator to instantiate a class in C#.Let’s say our class is Line. Instantiation will create a new object as shown below −Line line = new Line();Using the object, you can now call the method −line.setLength(6.0);Let us see the example −Exampleusing System; namespace LineApplication { class Line { private double length; // Length of a line public Line() { Console.WriteLine("Object is being created"); } public void setLength( double len ) { length = len; ...
Read MoreHow to iterate any Map in C#
C# has no built-in Math type. For the same, use a Dictionary.Firstly, create a Dictionary −Dictionary d = new Dictionary(); d.Add("keyboard", 1); d.Add("mouse", 2);Get the keys −var val = d.Keys.ToList();Now, use the foreach loop to iterate over the Map −foreach (var key in val) { Console.WriteLine(key); }To iterate it, try to run the following code −Exampleusing System; using System.Collections.Generic; using System.Linq; class Program { static void Main() { Dictionary d = new Dictionary(); d.Add("keyboard", 1); d.Add("mouse", 2); // get keys ...
Read MoreHow to iterate efficiently through an array of integers of unknown size in C#
To iterate efficiently through an array of integers of unknown size in C# is easy. Let’s see how.Firstly, set an array, but do not set the size −int[] arr = new int[] { 5, 7, 2, 4, 1 };Now, get the length and iterate through an array using for loop −for (int i = 0; i< arr.Length; i++) { Console.WriteLine(arr[i]); }Let us see the complete example −Exampleusing System; public class Program { public static void Main() { int[] arr = new int[] { 5, 7, 2, 4, 1 }; // Length Console.WriteLine("Length:" + arr.Length); for (int i = 0; i < arr.Length; i++) { Console.WriteLine(arr[i]); } } }OutputLength:5 5 7 2 4 1
Read MoreHow to iterate over a C# dictionary?
Firstly, add elements −IDictionary d = new Dictionary(); d.Add(1,97); d.Add(2,89); d.Add(3,77); d.Add(4,88);Now, get the keys −List myList = new List(d.Keys);To iterate −foreach (int k in myList) { Console.WriteLine("{0}, {1}", k, d[k]); }The following is an example −Exampleusing System; using System.Collections.Generic; public class Demo { public static void Main() { IDictionary < int, int > d = new Dictionary < int, int > (); d.Add(1, 97); d.Add(2, 89); d.Add(3, 77); d.Add(4, 88); List < int > myList = new List < int > (d.Keys); foreach(int k in myList) { Console.WriteLine("{0}, {1}", k, d[k]); } } }Output1, 97 2, 89 3, 77 4, 88
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