Constructors versus Initializors in C# [duplicate]

Question

Possible Duplicate:
What's the difference between an object initializer and a constructor?

In c# you can construct an object like:

public class MyObject{

     int val1;
     int val2;

     public MyObject(int val1, val2){
           this.val1 = val1;
           this.val2 = val2;
     }
}

With:

MyObject ob = new MyObject(1,2);

or with:

MyObject ob = new MyObject(){ val1 = 1, val2 = 2 };

What is the diference between that kind of constructors?

Answer 1

MyObject ob = new MyObject(){ val1 = 1, val2 = 2 };

is just syntactic sugar (i.e. shorthand) for

MyObject ob = new MyObject();
ob.val1 = 1;
ob.val2 = 2;

One difference between the two is that you can set readonly fields from the constructor, but not by using the shorthand.

A second difference is that a constructor with parameters forces the client to provide those values. See Constructor-injection vs. Setter injection for a good bit of background reading.

Answer 2

The difference is probably that the second won't compile.

You are missing a default constructor, which it calls in your second example.