Differences between Object, Var and Dynamic type

Implicit Types in C#: An Overview

C# is rich in data type. C# provides several different ways to represent variable types such as Object, Var, and Dynamic to store data of any type. In this C# Tutorial, we will explore more about Implicit Types which will include object vs var vs dynamic, differences between object, var, and dynamic in c#, and, when to use var object and dynamic.

What are Object, Var, and Dynamic type

Object:

• The object or System.Object is the base Type for all other types in C#.
• It can store any value and any other Type can be implicitly converted to it:
• It is the best way to declare variables without a type though.
• To use an object we need to cast it back to the required type each time.

Syntax

 object type_object_1 = “hello world”;
object type_object_2 = 55; // Value type 
object type_object_3 = true; // Value type
object type_object_4 = new MyCompany();  

Var:

• The ‘var’ is used to declare an implicitly typed variable.
• It is type-safe as the C# Compiler will determine the type based on what we initialize the variable to.
• Var is only used for variables defined in a method body.
• It is not used as a return type
• Var cannot be set to null (i.e. var student= null; is not valid)
• Var must be initialized (i.e. var student; only declaration is not valid either)
• As with an explicitly declared variable, a ‘var’ cannot be re-assigned to another type.

Syntax:

 var type_implicit = “hello world”;   

Dynamic :

• C# was 4.0 introduced a new type called "Dynamic".
• It is a new static type that is not known until runtime.
• At compile time, an element with it is assumed to support any operation so we need not be worried about the object, whether it gets the value from COM, the DOM, from reflection, or anything else in the program.
• Before dynamic errors are caught at runtime only.
• But, The dynamic type in C# uses the Dynamic Language Runtime (DLR).
• Hence, The dynamic status is compiled into a variable-type object that is dynamic at compile time, not at run time.

Syntax:

 dynamic type_dynamic = “hello world";  

Difference between Object, Var, and Dynamic type

Let's see Object vs. Var vs. Dynamic type variables:

Read More - C# Interview Questions For Freshers

What do you think?

I hope you will enjoy these three types while programming with C#. I would like to have feedback from my blog readers. Your valuable feedback, questions, or comments about this article are always welcome. Also, Consider our C# Programming Course for a better understanding of all C# concepts.

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