DEV Community πŸ‘©β€πŸ’»πŸ‘¨β€πŸ’»

Cover image for What are "var" and "dynamic" in C#?
Nima Owji
Nima Owji

Posted on

What are "var" and "dynamic" in C#?

Hello, My name is Nima Owji. I am 14. I am a C# programmer. Today, I wanna tell you what are the differences between var and dynamic in C#.

When did they add to C#?

First of all, I'm gonna tell you when did they add to C#.
"var" added in C# 3 but "dynamic" added in C# 4. They aren't available in earlier versions, so you should use C# 4 to up.

How to use variables?

You know how to declare a variable in C#.
For example:

public int x = 5;
private string y = "nima";
bool z = true;
Enter fullscreen mode Exit fullscreen mode

As you know, You should use a data type for your variable, then assign a name. You can also assign a value to your variable in declaration time, like the example.

This is the format of variables:

[Scope] [DataType] [Name];
Enter fullscreen mode Exit fullscreen mode

As you know we use "int" or "long" ... for numbers, "string" for strings and text. We all tell the compiler what is the datatype in the normal declaration.

How to use "var"

var will use like a data type in C#. You can assign all values to it, for example, "int", "string", "long", "List".
But how do we use them?

Look at the example:

var x = 5;
var y = "nima";
var z = true;
Enter fullscreen mode Exit fullscreen mode

It will select the best data type for your variable automatically.
But you can't change their data types like variables too. For example, this code will not work!

var x = 5;
x = "nima";
Enter fullscreen mode Exit fullscreen mode

Because you are assigning a string to an int variable.
Now, what are the "dynamic"s?

What are the "dynamic"s?

dynamics are another type like "var". It will select the best data type for your variable based on your value. dynamics won't be checked at compile time. They be will checked at runtime.

Like this:

dynamic x = 5;
dynamic y = "nima";
dynamic z = true;
Enter fullscreen mode Exit fullscreen mode

But what is the difference between "dynamic" and "var"?
As I told you, you can't change the data type of a variable. But you can do that in "dynamic"!

Example for "dynamic"

Look at this example:

dynamic x = 5;
x = "nima";
x = 'a';
x = false;
Enter fullscreen mode Exit fullscreen mode

This will work correctly.

The end

These were the most important things you have to know about "var" and "dynamic" in C#.
I hope you liked this article.

Don't forget to like it

Please like this article and follow me on Twitter: @nima_owji .
Thank you so much. Byeeee!

Top comments (11)

Collapse
 
prajai1803 profile image
Prakhar Jaiswal

what is the meaning of unicorn which is beside of heart

Collapse
 
alainvanhout profile image
Alain Van Hout

It's a step up compared to the β™₯️: something along the lines of "I not only like this, I think it's extra special".

Collapse
 
nima_owji profile image
Nima Owji

Yes, I think too

Collapse
 
nima_owji profile image
Nima Owji

I don't know too XD I think it works like like button. press it

Collapse
 
armandomeabe profile image
Armando AndrΓ©s Meabe

Thanks!

Collapse
 
nima_owji profile image
Nima Owji

You're welcome

Collapse
 
nima_owji profile image
Nima Owji

Thank you so much. Thankssss

Collapse
 
nima_owji profile image
Nima Owji

If you have any questions, ask me!

Collapse
 
nima_owji profile image
Nima Owji

Please follow me on Twitter!

Collapse
 
nima_owji profile image
Nima Owji

Please don't forget to like it!

We want your help! Become a Tag Moderator.
Fill out this survey and help us moderate our community by becoming a tag moderator here at DEV.