Difference among var, dynamic and object

Knowing var, dynamic and object

object

Everything in .net framework is inherited from object class. This is a base type. Every datatype can be boxed in the object type

Example

object a = 10; // int

object b = new Customer(); // customer object

object c = new Product(); // product object

object d = "Jon"; // string

object e = new { Name = "Felipe", Age = 20 }; // anonymous type

var

var is a keyword in c#. It allows you to define a variable which can contain any type. Once it is assigned a type the variable can contain only that type

Example

var a = 10; // int

var b = 10d; // double

var c = "text"; // string

var p = new Product(); // Product type

Here if we try to use the ‘a’ again and assign string data to it, it will now allow.

dynamic

As the name suggest dynamic is a special type which does not compile during normal compilation period. It is used when the output or the input type is unknown, also you can reuse the same variable and assign any type to it during the same method run

Example

dynamic cust = new CustomerDetails();

cust.Age = 18;

cust.Name = "Ishoo";

cust.Name; // string

cust.Age; // int

To learn more on dynamic and var download the project from gihub and look for ‘Accessing and setting private or internal of different project using reflection’ region in Main of program.cs