what is the difference between new Object{} and new Object(){}

Question

I define objects from class in C# this way

var something = new SomeThing()
{
    Property = "SomeProperty"
}

and this way

var something = new SomeThing
{
    Property = "SomeProperty"
}

what is the difference between these definitions?

Answer 1

Nothing. The () is redundant. The only thing required is that the object has a default constructor.

Answer 2

There's no difference as such. Parentheses are optional when using a function as a constructor (with the new operator and no parameters). Parentheses are always required when calling a function when you do not use the new operator.

Answer 3

You can omit the parentheses, the default constructor will be used (assuming one is available).

When using object initializers, you only need to use parentheses if you want to specify a different constructor.

Eric Lippert's take on why the parentheses were made optional: https://stackoverflow.com/a/3661197

Answer 4

Nothing, when the parentheses are empty.

They only make sense when you provide a parameter; you can do that at the same time:

var something = new SomeThing("some other value")
{
    Property = "SomeProperty"
}

Answer 5

There is no difference. You can omit the empty braces in this case. For the compiler, those two are 100% equivalent.