C # Object initialization[full VERSION]

Original address: http://www.csharp411.com/c-object-initialization/

When constructing a C # object, it is important to understand the scope of the object and the sequence in which the constructor is initialized

Derived static fields

Derived Static constructor

Derived instance Fields

Base static fields

Base Static constructor

Base instance Fields

Base Instance Constructor

Derived Instance Constructor

Example

The following is an example of a C # console program that illustrates the order of object initialization

This program creates the derived object of the base object, contains the static and instantiated constructors and scopes, and the two scopes "Field1" and "Field2" are initialized in their definition, but "Field3" is initialized in the constructor. It also contains a virtual method that proves why a virtual method cannot be invoked from a constructor. The console is written when each scope and constructor is initialized, so you can see the initialized sequence

using System;

namespace Objectinit
{
Class program
{
static void Main (string[] args)
{
Derived d = new Derived ();
Console.ReadLine ();
}
}
Class base
{
Public base ()
{
Console.WriteLine ("Base.Instance.Co Nstructor ");
This.m_field3 = new Tracker ("Base.instance.field3″");
this. Virtual (); 　　　　
}
Static Base ()
{
Console.WriteLine ("Base.Static.Constructor");

Private Tracker m_field1 = new Tracker ("Base.instance.field1″");
Private Tracker m_field2 = new Tracker ("Base.instance.field2″");
Private Tracker m_field3;
Static private Tracker s_field1 = new Tracker ("Base.static.field1″");
Static private Tracker s_field2 = new Tracker ("Base.static.field2″"); 　　　　
Virtual public void virtual ()
{
Console.WriteLine ("Base.Instance.Virtual");
}
}
Class Derived : Base
{
Public Derived ()
{
Console.WriteLine ("Derived.Instance.Constructor");
this.m_field3 = new Tracker ("Derived.instance.field3″"); 　　　　
}
Static Derived ()
{
Console.WriteLine ("Derived.Static.Constructor");

Private Tracker m_field1 = new Tracker ("Derived.instance.field1″");
Private Tracker m_field2 = new Tracker ("Derived.instance.field2″");
Private Tracker m_field3;
Static private Tracker s_field1 = new Tracker ("Derived.static.field1″");
Static private Tracker s_field2 = new Tracker ("Derived.static.field2″"); 　　　　
Override public void Virtual ()
{
Console.WriteLine ("Derived.Instance.Virtual");

}
Class Tracker
{
Public Tracker (string text)
{
Console.WriteLine (text);
}
}
}