CODEWITHSUNDEEP
c#classinstance
Veewoo
Veewoo

Reputation: 85

What is the difference between with and without () symbol in creating an instance of an object in C#?

I have a class Product

public class Product
{
    public string Name { get; set; }
}

Could you please help me to explain the difference between two case of creating the instance of Product class below?

var instanceOne = new Product
{
    Name = "iPhone 4"
}

and

var instanceTwo = new Product()
{
    Name = "iPhone 5"
}

Thanks

Upvotes: 0

Views: 126

Answers (3)

user585968
user585968

Reputation:

The () is redundant in the following example:

var instanceTwo = new Product()
{
    Name = "iPhone 5"
}

You can just write:

var instanceTwo = new Product // <----- () deleted
{
    Name = "iPhone 5"
}

Upvotes: 0

tmaj
tmaj

Reputation: 35085

There is no difference between these two.

Please note that object initalisers allow specifying constructor parameters too.

class Cat 
{
    public Cat() {}

    public Cat(string name) { Name = name; }

    public string Name { get; set; }

    public string Color { get; set; }
}

(...)

var lightning = new Cat(Name: "Lightning")
{
    Color = "White"
};

var storm = new Cat
{
    Name = "Storm",
    Color = "Gray"
};

A tiny bit more

Please also note that

var storm = new Cat
{
    Name = "Storm",
    Color = "Gray"
};

is not the same as

var storm = new Cat();
storm.Name = "Storm";
storm.Color = "Gray";

The former results in:

var __a = new Cat();
__a.Name = "Storm";
__a.Color = "Gray"; 
var storm = __a;

as shown in Overview of C# 3.0.

Upvotes: -1

Blindy
Blindy

Reputation: 67439

There is no difference, they're the same (assuming you meant to initialize the Name property, not define it, and it can't be static), except for one very specific case:

Product instanceOne = new()
{
    Name = "arf"
};

If you use type-targetted new, you have to use the new() {...} version, because new {...} defines an anonymous type instead.

Upvotes: 2

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