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Csharp Articles
Page 98 of 196
Final local variables in C#
To set final for a local variable, use the read-only keyword in C#, since the implementation of the final keyword is not possible.The readonly would allow the variables to be assigned a value only once. A field marked "read-only", can only be set once during the construction of an object. It cannot be changed.Let us see an example. Below, we have set the empCount field as read-only, which once assigned cannot be changed.Exampleclass Department { readonly int empCount; Employee(int empCount) { this. empCount = empCount; } void ChangeCount() { //empCount = 150; // Compile error } }
Read MoreHow to copy a List collection to an array?
To copy a C# list collection to an array, firstly set a list −List list1 = new List (); list1.Add("One"); list1.Add("Two"); list1.Add("Three"); list1.Add("Four");Now declare a string array and use the CopyTo() method to copy −string[] arr = new string[20]; list1.CopyTo(arr);Let us see the complete code to copy a list into a one – dimensional array.Exampleusing System; using System.Collections.Generic; using System.Linq; public class Demo { public static void Main() { List list1 = new List (); list1.Add("One"); list1.Add("Two"); list1.Add("Three"); list1.Add("Four"); ...
Read MoreWhat are the differences between a list collection and an array in C#?
List collection is a generic class and can store any data types to create a list. To define a List −List l = new List();To set elements in a list, you need to use the Add method.l.Add("One"); l.Add("Two"); l.Add("Three");An array stores a fixed-size sequential collection of elements of the same type.To define Arrays −int[] arr = new int[5]; To initialize and set elements to Arrays −int[] arr = new int[5] {4, 8,5};
Read MoreWhat are the differences between a multi-dimensional array and jagged array?
Multi-dimensional arrayMulti-dimensional arrays are also called rectangular array. You can define a 3-dimensional array of integer as −int [ , , ] val;Let us see how to define a two-dimensional array.int[,] val = new[3,3] Jagged arrayA Jagged array is an array of arrays. To access an element from it, just mention the index for that particular array.Here, we have a jagged array with 5 array of integers −int[][] a = new int[][]{new int[]{0,0},new int[]{1,2}, new int[]{2,4},new int[]{ 3, 6 }};
Read MoreWhat are the differences between a static and a non-static class in C#?
The following is the difference between a static and non-static class −Non-static classes can be instantiated, whereas static classes cannot be instantiated i.e. you cannot use the new keyword to create a variable of the class typeStatic classes can only have static methods.Non-static classes can have instance method and static methods.ou access the members of a static class by using the class name itselfStatic class is sealed.Example of static class −public static class CalculateExample of non-static class −public class Calculate
Read MoreHow to copy or clone a C# list?
To copy or clone a C# list, firstly set a list −List < string > list1 = new List < string > (); list1.Add("One"); list1.Add("Two"); list1.Add("Three"); list1.Add("Four");Now declare a string array and use the CopyTo() method to copy.string[] arr = new string[20]; list1.CopyTo(arr);Let us see the complete code to copy a list into a one-dimensional array.Exampleusing System; using System.Collections.Generic; using System.Linq; public class Demo { public static void Main() { List < string > list1 = new List < string > (); list1.Add("One"); list1.Add("Two"); list1.Add("Three"); ...
Read MoreWhat is boxing in C#?
Boxing convert value type to an object type. Let us see an example of boxing −int x = 50; object ob = x; // boxingIn boxing, the value stored on the stack is copied to the object stored on heap memory, whereas unboxing is the opposite.Boxing is useful in storing value types in the garbage-collected heap. It is implicit conversion of a value type to the type object.Let us see an example −Exampleusing System; using System.Collections.Generic; using System.Linq; public class Demo { static void Main() { int x = 50; object ...
Read MoreWhat is C# Programming?
C# is a modern, general-purpose, object-oriented programming language developed by Microsoft.C# is designed for Common Language Infrastructure (CLI), which consists of the executable code and runtime environment that allows the use of various high-level languages on different computer platforms and architectures.Here are the features of C# −Boolean ConditionsAutomatic Garbage CollectionStandard LibraryAssembly VersioningProperties and EventsDelegates and Events ManagementEasy-to-use GenericsIndexersConditional CompilationSimple MultithreadingLINQ and Lambda ExpressionsIntegration with Windows
Read MoreWhat is Cast Operator () in C#?
Type conversion is converting one type of data to another type. Explicit conversions are done explicitly by users using the pre-defined functions and require a cast operator.Let us see an example to cast double to int −Exampleusing System; namespace Demo { class Program { static void Main(string[] args) { double a = 4563.56; int x; x = (int)a; Console.WriteLine(x); Console.ReadKey(); } } }To cast double to int, we perfomed explicit type casting −x = (int)a;
Read MoreWhat is the difference between implicit and explicit type conversion in C#?
The following is the difference between implicit and explicit type conversion −Implicit Type ConversionThese conversions are performed by C# in a type-safe manner.To understand the concept, let us implicitly convert int to long.int val1 = 11000; int val2 = 35600; long sum; sum = val1 + val2;Above, we have two integer variable and when we sum it in a long variable, it won’t show an error. Since the compiler does the implicit conversion on its own.Let us print the values now.Exampleusing System; using System.IO; namespace Demo { class Program { static void Main(string[] args) ...
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