[C#] Initialize var with null (Set var to null)

筆記一下var 需要初始化為 null 的寫法。
var result = (dynamic)null;

其他作法:

//initializes to non-null; cannot be reassigned a value of any type; I prefer this

var x = new { };

//initializes to non-null; can be reassigned a value of any type

var x = new object();

//initializes to null; dangerous and finds least use; can be reassigned a value of any type

dynamic x = null;

var x = (dynamic)null;

//initializes to null; more conventional; can be reassigned a value of any type

object x = null;

//initializes to null; cannot be reassigned a value of any type

var x = (T)null; 

Reference: http://www.itorian.com/2015/04/initialize-var-with-null-or-empty-in-c.html