C＃中没有（）的类初始化

Question

In c# I used to init my class by calling default constructor. You can mention () after class name

var class = new MyClass()
{
   Property= 1,
   Property2 = "test"
}

But last time I see examples without () . Like this

var class = new MyClass
{
   Property= 1,
   Property2 = "test"
}

Is there any difference with and without ()?

Answer 1

There are no differences. If you use resharper, it mark this () as redundant.

You can use () or not, It depends on your style.

Answer 2

This feature is called Object Initializer and it's been introduced in C#3.0.

When you use it, the () are redundant, so there is no difference between your two code samples

Answer 3

As you see in the IL Code they are identical:

 internal class Program
    {
        public class MyClass
        {
        public int Property
        {
            get;
            set;
        }

        public string Property2
        {
            get;
            set;
        }
    }

    private static void Main(string[] args)
    {
        Program.MyClass expr_06 = new Program.MyClass();
        expr_06.Property = 1;
        expr_06.Property2 = "test";
        Program.MyClass expr_20 = new Program.MyClass();
        expr_20.Property = 1;
        expr_20.Property2 = "test";
    }
}