Automatic properties and object initializers in c#3.0

It is more convenient to define attributes in c#3.0 no longer in the same way as the previous version of the cumbersome, you need to define the fields to store data, and then define the property, now only need to define the property can be, the other compiler automatically for us to complete, you can omit the time required to define the field , when object initialization we can implement the initialization of object properties, similar to collection initialization.

1. Anonymous Properties

The definition attributes are as follows:

public class Employee
{
public int Id {get; set;}
public string Name {get; set;} 　
public string Sex {get; set;
public int Age {get; set;}
public string Birthdate {get; set;}
}
is written before c#3.0 as follows:
public class Employee
{
private int _id;
private string _name;
Private str ing _sex;
Private int _age;
private String _birthdate;

Public int Id
{
get {_id;}
Set {_id = value;}
}
public string Name
{
get {_name;}
Set {_name = value;}
}
public string Sex
{
get {return _sex;}
Set {_sex = value;}
}
Public int:
{
get {return _age;}
Set {_age = value;}
}
public string birthdate
{
get {return _birthdate;}
Set {_birthdate = value;}
}
}

It's clear from the code that the former is 2/3 less than the latter, which is obvious for efficiency, so where does all this code go? In fact, the extra code is done for us by the compiler, and the compiler will fill in the code that we "omit" into the managed IL code, the code in the final generation of the IL Code is the same volume.

In the IL code above, we see that fields such as K_backingfield are the field codes that the compiler generates automatically.