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Csharp Articles
Page 97 of 196
Default value of StringBuilder in C#
Use the default operator to get the default value of StringBuilder.StringBuilder str = default(StringBuilder);Above, we have used the default keywords to get the default value.Let us see the complete code −Exampleusing System; using System.Text; public class Demo { public static void Main() { StringBuilder str = default(StringBuilder); Console.WriteLine("Default for StringBuilder = "+str); } }OutputDefault for StringBuilder =The following is the output. It shows a blank space i.e. Null.Default for StringBuilder = Null
Read MoreDefault value of bool in C#
Use the default operator to get the default value of bool type −bool a = default(bool);Above, we have used the default keyword to get the default value.Let us see the code to display default value of bool −Exampleusing System; public class Demo { public static void Main() { bool a = default(bool); // default for bool Console.WriteLine("Default for bool type = "+a); } }OutputThe following is the output. It shows a blank space i.e. False.Default for bool type = False
Read MoreThe nameof keyword in C#
The nameof operator returns a string literal of an element that can be a variable, type or member.For example, the following is our variable −var vehicle = "motorbike";To get the string literal, use nameof −nameof(vehicle);The following is the code to implement nameof keyword −Exampleusing System; public class Program { static void Main() { var vehicle = "motorbike"; Console.WriteLine(nameof(vehicle)); var time = DateTime.Now.ToLocalTime(); Console.WriteLine(nameof(time)); var a = false; Console.WriteLine(nameof(a)); } }Outputvehicle time a
Read MoreEnum.GetName in C#
Gets the string representation of an Enum value using the Enum.GetName.It has two parameters −Type − Enumeration typeObject − Value of an enumerationThe following is an example −Exampleusing System; class Demo { enum Vehicle { Car, Motorbike, Truck, Bicycles }; static void Main() { // Usig GetName to get the string representation of enum type string res = Enum.GetName(typeof(Vehicle), Vehicle.Motorbike); // Displaying Console.WriteLine(res); } }OutputMotorbike
Read MoreEnum.GetNames in C#
It gets an array of the names of constants in an enumeration. The following is the syntax −Enum.GetNames(Type)Here, Type is an enumeration type.The following is an example −Exampleusing System; class Demo { enum Vehicle { Car, Motorbike, Truck, }; static void Main() { // display the enum foreach ( string res in Enum.GetNames ( typeof (Vehicle))) Console.WriteLine (res); } }OutputCar Motorbike Truck
Read MoreC# NullReferenceException
NullReferenceException occurs when you try to to access member fields, or function types that points to null.Here is an example −Exampleusing System; class Demo { static void Main() { string str = null; if (str.Length > 0) { Console.WriteLine(str); } } }OutputThe following is the output. It throws NullReferenceException, since you are tryonhg access a memebt that points to null −Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object at Demo.Main () [0x00002] in :0 [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object at Demo.Main () [0x00002] in :0
Read MoreCombine two arrays in C#
Firstly, declare and initialize two arrays −int[] arr1 = { 37, 45, 65 }; int[] arr2 = { 70, 89, 118 };Now create a new list −var myList = new List(); myList.AddRange(arr1); myList.AddRange(arr2);Use the AddRange() method the arrays into the newly created list.myList.AddRange(arr1); myList.AddRange(arr2);Now convert the list into array as shown below −Exampleusing System; using System.Collections.Generic; class Demo { static void Main() { int[] arr1 = { 37, 45, 65 }; int[] arr2 = { 70, 89, 118 }; // displaying array1 Console.WriteLine("Array 1..."); ...
Read MoreBuffer Type in C#
To handle range of bytes, use Buffer Type in C#. Its method Buffer.BlockCopy copies the bytes from one byte array to another byte array.Exampleusing System; class Demo { static void Main() { // byte arrays byte[] b1 = new byte[] {39, 45, 58 }; byte[] b2 = new byte[5]; // copying bytes from one to another Buffer.BlockCopy(b1, 0, b2, 0, 3); /* calling the method with the byte array b2 that has the copied elements */ bufferFunc(b2); } static void bufferFunc(byte[] a) { for (int j = 0; j < a.Length; j++) { Console.Write(a[j]); } Console.WriteLine(); } }Output39455800
Read MoreReplace a C# array with a new array of different size
To replace a C# aray with a new array, use the Array.Resize.Withing that, set the size of the new array −Array.Resize(ref arr, 4);Now add the new elements to the array as shown below −Exampleusing System; class Program { static void Main() { char[] arr = new char[5]; arr[0] = 'J'; arr[1] = 'A'; Array.Resize(ref arr, 4); // Set value for new elements arr[2] = 'C'; arr[3] = 'K'; Console.WriteLine("Updated Array : "+ new string(arr)); } }OutputUpdated Array : JACK
Read MoreC# program to count number of bytes in an array
Set a byte array −byte[] b = { 5, 9, 19, 23, 29, 35, 55, 78 };To count number of bytes −Buffer.ByteLength(b)The following is the code −Exampleusing System; class Program { static void Main() { byte[] b = { 5, 9, 19, 23, 29, 35, 55, 78 }; int len = Buffer.ByteLength(b); for (int i = 0; i < len; i++) { Console.WriteLine(b[i]); } Console.WriteLine("Length of byte array = "+len); } }Output5 9 19 23 29 35 55 78 Length of byte array = 8
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