Csharp Articles - Page 127 of 258

The GetLongLength method in C# gets a 64-bit integer that represents the number of elements in the specified dimension of the Array.First, set the array.long[,] arr2= new long[15, 35];For a specified dimension of the array, set the index in the GetLongMethod() method like −long len2 = arr2.GetLongLength(0);Let us see the complete example.Example Live Demousing System; class Program {    static void Main() {       int[,] arr = new int[20, 30];       int len = arr.GetLength(0);       Console.WriteLine(len);       long[,] arr2= new long[15, 35];       long len2 = arr2.GetLongLength(0);       Console.WriteLine(len2);    } }Output20 15

The Directory class in C# is used to manipulate the directory structure. It has methods to create, move, remove directories.The following are some of the methods of the Directory class.Sr.No.Method & Description1CreateDirectory(String)Creates all directories and subdirectories in the specified path2Delete(String)Deletes an empty directory3Exists(String)Whether the given path refers to an existing directory4GetCreationTime(String)Gets the creation date and time of a directory.5GetCurrentDirectory()Gets the current working directory6GetFiles(String)Let us learn about the usage of GetFiles() method in Directory class. It displays all the files in the specified directory.Exampleusing System; using System.IO; class Program {    static void Main() {       // Get all ... Read More

As the name suggests the Array.Copy() method in C# is used to copy elements of one array to another array.The following is the syntax.Array.Copy(src, dest, length);Heresrc = array to be copieddest = destination arraylength = how many elements to copyThe following is an example showing the usage of Copy(,,) method of array class in C#.Example Live Demousing System; class Program {    static void Main() {       int[] arrSource = new int[4];       arrSource[0] = 99;       arrSource[1] = 66;       arrSource[2] = 111;       arrSource[3] = 33;       int[] arrTarget = new int[4];       Array.Copy(arrSource, arrTarget, 4);       Console.WriteLine("Destination Array ...");       foreach (int value in arrTarget) {          Console.WriteLine(value);       }    } }OutputDestination Array ... 99 66 111 33

The Array.Clear class in C# clears i.e.zeros out all elements.In the below example, we have first considered an array with 3 elements.int[] arr = new int[] { 11, 40, 20};Now we have used the Array.clear method to zero out all the arrays.Array.Clear(arr, 0, arr.Length);Let us see an example of Array.clear method in c#.Example Live Demousing System; class Program {    static void Main() {       int[] arr = new int[] {11, 40, 20};       Console.WriteLine("Array (Old):");       foreach (int val in arr) {          Console.WriteLine(val);       }       ... Read More

A conditional operator is represented by the symbol '?:' The first operand is the evaluating expression. It has right to left associativity.The syntax for conditional operator.expression ? expression : expressionThe conditional operator works as follows −The first operand is implicitly converted to bool.If the first operand evaluates to true, the second operand is evaluated.If the first operand evaluates to false, the third operand is evaluated.Remember, only one of the last two operands is evaluated in a conditional expression.Example Live Demousing System; namespace Demo {    class Program {       static void Main(string[] args) {          int ... Read More

The following is the unsorted array.int[] list = {98, 23, 97, 36, 77};Now first use the Sort() method to sort the array.Array.Reverse(list);Use the Reverse() method that would eventually give you a sorted array in descending order.Array.Reverse(list);You can try to run the following code to to sort one dimensional array in descending order.Example Live Demousing System; namespace Demo {    public class MyApplication {       public static void Main(string[] args) {          int[] list = {98, 23, 97, 36, 77};          Console.WriteLine("Original Unsorted List");          foreach (int i in list) { ... Read More

With StringBuilder, you can expand the number of characters in the string. String cannot be changed once it is created, but StringBuildercan be expanded. It does not create a new object in the memory.Initialize StringBuilder.StringBuilder str = new StringBuilder();Let us see an example to learn how to work with StringBuilder in C#.Example Live Demousing System; using System.Text; public class Program {    public static void Main() {       StringBuilder str = new StringBuilder("Web World!!",30);       str.Replace("World", "Arena");       Console.WriteLine(str);    } }OutputWeb Arena!!Above the Replace() method of StringBuilder is used to to replace a string in C#.

For the Boolean type, the bool keyword is used and is an alias of System.Boolean.It is used to declare variables to store the Boolean values, true and false.Let us see an example to learn how to use bool in C#.Exampleusing System; public class Demo {    static void Main() {       bool val = true;       int d = DateTime.Now.DayOfYear;       val = (d % 2 == 0);       if (val) {          Console.WriteLine("days: even number");       } else {          Console.WriteLine("days:odd number");       }    } }

A class can be derived from more than one class or interface, which means that it can inherit data and functions from multiple base classes or interfaces.For example, Vehicle Base class with the following Derived Classes.Truck Bus MotobikeThe derived class inherits the base class member variables and member methods.In the same way, the derived class for Shape class can be Rectangle as in the following example.Example Live Demousing System; namespace Program {    class Shape {       public void setWidth(int w) {          width = w;       }       public void setHeight(int ... Read More

To sort an ArrayList in C#, use the Sort() method.The following is the ArrayList.ArrayList arr = new ArrayList(); arr.Add(32); arr.Add(12); arr.Add(55); arr.Add(8); arr.Add(13);Now the Sort() method is used to sort the ArrayList.arr.Sort();You can try to run the following code to sort an ArrayList in C#.Example Live Demousing System; using System.Collections; namespace Demo {    class Program {       static void Main(string[] args) {          ArrayList arr = new ArrayList();          arr.Add(32);          arr.Add(12);          arr.Add(55);          arr.Add(8);          arr.Add(13);     ... Read More