Minifycode 2021-10-03 Viewed 1K times C#

In this article, you will learn what is 'as' Keyword in c#

 In many cases, we need to convert an Object(Type) into another Object(Type) and sometimes you may get InvalidCastException. So, to overcome such types of exceptions C# provides as operator keyword.

This operator returns the object when they are compatible with the given type and returns null if the conversion is not possible instead of throwing an exception.

'as' keyword checks the compatibility of one object type with another object type. In the case of compatibility, it will return the value of the new object type otherwise, null will be returned.

Syntax of 'as' keyword

 

Expression as dataType;
using System; 
using System.Text; 
using System.Collections.Generic; 
  
class usingcsharp{     
    
    public static void Main() { 
          
        // taking a string variable 
        string str1 = "abc"; 
          
        // taking an Object type variable 
        // assigning var1 to it 
        object obj1 = str1; 
          
        // now try it to cast to a string 
        string str2 = obj1 as string;           
       
        if(str2 != null) 
        { 
            Console.WriteLine("Success"); 
        } 
          
        // now try to cast it to List 
        List<string> mylist = obj1 as List<string>; 
          
        // checking Successfully cast or not 
        if(mylist != null) 
        { 
            Console.WriteLine("Success"); 
        } 
        else
        { 
            Console.WriteLine("Not Successfull"); 
        } 
          
    } 
} 

as Keyword in c#- In many cases, we need to convert an Object(Type) into another Object(Type) and sometimes you may get InvalidCastException. So, to overcome such types of exceptions C# provides as operator keyword. This operator returns the object when they are compatible with the given type and returns null if the conversion is not possible instead of throwing an exception. 'as' keyword checks the compatibility of one object type with another object type. In the case of compatibility, it will return the value of the new object type otherwise, null will be returned.
C# is a programming language developed by Microsoft that runs on the .NET Framework. C# is used to develop web, desktop, mobile, games and much more application. C# is a object-oriented programming language developed by Microsoft within its .NET Framework. Led by Anders Hejlsberg, your basic C# programming and will also take you through various advanced concepts related to C# programming language. C# such as control statements, objects and classes, inheritance, constructor, destructor, this, static, sealed, polymorphism, abstraction, abstract class, interface, File IO, Collections, namespace, encapsulation, properties, indexer, arrays, strings, regex, exception handling, multithreading etc. For example... using System; namespace MinifyCode { class Program { static void Main(string[] args) { Console.WriteLine("Hello Minify Code"); } } } Output: Hello Minify Code In this article you will learn, what is server side controls. We will discuss each of these objects in due time. In this tutorial we will explore the Server object, the Request object, and the Response object. Session Application Cache Request Response Server User Trace Server Object The Server object in Asp.NET is an instance of the System.Web.HttpServerUtility class. The HttpServerUtility class provides numerous properties and methods to perform many type of jobs. Methods and Properties of the Server object The methods and properties of the HttpServerUtility class are exposed through the intrinsic Server object provided by ASP.NET. using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Optimization; using System.Web.Routing; using System.Web.Security; using System.Web.SessionState; using System.Data.Entity; namespace minifycode { public class Global : HttpApplication { void Application_Start(object sender, EventArgs e) { // Code that runs on application startup RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); // Initialize the product database. Database.SetInitializer(new ProductDatabaseInitializer()); // Create custom role and user. RoleActions roleActions = new RoleActions(); roleActions.AddUserAndRole(); // Add Routes. RegisterCustomRoutes(RouteTable.Routes); } void RegisterCustomRoutes(RouteCollection routes) { routes.MapPageRoute( "ProductsCategoryRoute", "Category/{categoryName}", "~/ProductList.aspx" ); routes.MapPageRoute( "ProductNameRoute", "Product/{productName}", "~/ProductDetails.aspx" ); } } }