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Table of contents
1.
Introduction
2.
Var
3.
Dynamic
4.
Difference between var and Dynamic
5.
Frequently Asked Questions
5.1.
In C#, what is the purpose of using var data type?
5.2.
What is the type of variable var?
5.3.
In C#, what is the purpose of using dynamic data type?
5.4.
Is dynamic type in C# a good idea?
5.5.
Is it possible to assign null to dynamic in C#?
6.
Conclusion
Last Updated: Mar 27, 2024
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var vs Dynamic in C#

Author Manan Singhal
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Ashwin Goyal
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Introduction

As we all know, programming in any language begins with the declaration of a variable, followed by its definition and logic implementation. As a result, knowing how to declare variables in any programming language is crucial before beginning to code in it.

Looking at the C# language, we can see that the declaration of variables has changed as the language progresses. All of the code created in previous versions of C# was checked at build time, making it a statically typed language with variables declared using the var keyword. After C#4.0, the dynamic was introduced, allowing just run-time syntax validation and error checking. It also introduced the keyword dynamic for variable declaration.

Recommended Topic, Palindrome in C#, singleton design pattern in c#, and Ienumerable vs Iqueryable.

Var

Implicitly Typed Local Variables (var) are variables that are declared without explicitly providing the.NET type. The type of an implicitly typed variable is automatically determined by the compiler at compilation time from the value used to initialize the variable. C# 3.0 introduces the idea of implicitly typed variables. The implicitly typed variable isn't meant to take the place of a regular variable declaration; rather, it's meant to handle particular cases like LINQ (Language-Integrated Query).

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Dynamic

A new type known as a dynamic type is introduced in C# 4.0. It is used to circumvent type verification at compile time. The type of the dynamic type variable is not checked by the compiler at compile-time; instead, the type is obtained at run time. The dynamic keyword is used to construct the dynamic type variable.

Difference between var and Dynamic

Var

Dynamic

var in c sharp language is introduced in C#3.0 On the other hand, the dynamic is introduced later in C#4.0
The variables are declared using var keywords that are statically typed. The variables are declared using dynamic keywords that are dynamically typed.
The compiler determines the variable's type at compile time. The compiler determines the variable's type during run-time.
This type of variable should be initialized when it is declared. As a result, the compiler will determine the type of the variable based on the value it was initialized with. This type of variable does not require initialization at the time of declaration. Because at compilation time, the compiler does not know the type of the variable.
Throws an error if a variable is not initialized. There will be no error if the variable is not initialized.
In Visual Studio, it supports IntelliSense. Visual Studio does not support IntelliSense.

var temp = 10;

temp = “CodingNinjas”;

The compiler will throw an error since the type of the temp variable has already been determined by statement 1, which is an integer type. When you assign a string to the temp variable, the compiler complains about a safety rule violation.

dynamic temp = 10;

temp = “CodingNinjas”;

Even though temp's type is an integer, the compiler will not error. When you assign a string to temp, the type of temp is recreated, and the string is accepted without a problem.

It can't be used to return values from a function or for properties. It can only be used as a function's local variable. It can be used to return values from a function or for properties.

Frequently Asked Questions

In C#, what is the purpose of using var data type?

Keywords are terms in a language that indicate predetermined activities or are utilized for internal processes. The term var is used to declare an implicit type variable, which specifies its type depending on its initial value.

What is the type of variable var?

Declaration of implicit type variables in C# is made with the var keyword.

In C#, what is the purpose of using dynamic data type?

A new type known as a dynamic type is introduced in C# 4.0. It is used to circumvent type verification at compile time. The compiler does not determine the type of the dynamic type variable at compile time; instead, the type is obtained at run time.

Is dynamic type in C# a good idea?

Using dynamic type in every situation when it is possible is a terrible idea because your applications will no longer benefit from the compile-time inspection and will be significantly slower.

Is it possible to assign null to dynamic in C#?

You can't use null as a type T value because it's not guaranteed to be valid. (Think int, for example.) You can, however, use the default(T) to retrieve the default value for T, which is the same value you'd get if you left a T field uninitialized, for example.

Conclusion

In this article, we have learned the difference between var and dynamic in C#. We hope that this blog is going to help you understand the use of var and dynamic in C#, and if you like to learn more about it, check out our other blogs on arrays in C#string in C#static class in C#, and operators in C#.

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