Insert code in a Custom Control between member create and property initialization

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Hello, I'm trying to develop a WPF custom control which inherits from ComboBox.

The custom controls contains properties which references other classes. At runtime, the classes referenced by properties are created auto after the execution of the contructor of the user control and just after the initialization of the internal properties of the class are executed.

I want to execute code between the creation of the properties and the initialization (of the internal properties of the class) but I don't find where or how, I tried to override BeginInit, Initialized, Loaded with no results, it seems that the creation and initialization is produces is a block.

Is there any way to do this?

Thanks every body for your help.

I'm going to try ilustrating this. I put numbers <x> to show the sequence, I would like to execute code between 3 and 4:

class MyUserControl: ComboBoxEdit
{
	//Constructor
	public MyUserControl()
	{
		<1>
	}
	
	protected override void BeginInit()
	{
		<2>
		base.BeginInit();
		<5>
	}
	
	public MyProperty myProperty
	{
		get {...}
		set {...}
	}
}

class MyProperty 
{
	public Property1 { get {...} set {<4>...} }
	public Property2 { get {...} set {<4>...} }
	
	public MyProperty()
	{
		<3>
	}
}

Posted 2-Aug-11 5:26am

charly1970

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Wjousts 2-Aug-11 17:03pm

Where's 4?

charly1970 2-Aug-11 17:59pm

it's in the "set" of the properties in MyProperty, it executes just after contructor <3>

Sergey Alexandrovich Kryukov 3-Aug-11 4:36am

Please don't post non-answer as solution. Use "Improve question" or "Add comment" to a solution or reply to existing comment.

I did not understand why my suggestion does not resolve your problem. If you want better solution, please make use-case of what you want which would clearly illustrate your requirements.
--SA

charly1970 3-Aug-11 11:15am

I want to be able to execute code inside MyUserControl class between steps <3> and <4>. BeginInit method (MyUserControl class) is responsible of creation of MyProperty class (step <3>) and it makes the initialization of its properties too (step <4>), so where I can put code in MyUserControl Class which executes between these two steps?
I know it's difficult to understand I've tried to make my example as easy as I can. I'm very grateful with you for your answers. Some way to illustrate this is divide the BeginInit method in two parts (if it were possible...):

protected override void BeginInit()
{
<2>
base.BeginInit_ForCreation(); // this would execute the part 3 in MyProperty class
Here my code....
base.BeginInit_ForInitialization(); // this would execute the part 4 in MyProperty class
<5>
}

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-08-02T12:02:00

Just create 5 events; raise each event where your placeholders are. For example.

C#

public event System.EventHandler StartingInitialization;
public event System.EventHandler StartedInitialization;

//..

protected override void BeginInit() {
   if (StartingInitialization != null) //instead of #2
      StartingInitialization(this, new System.EventArgs());
   base.BeginInit();
   if (StartedInitialization != null) //instead of #5
      StartedInitialization(this, new System.EventArgs());
}

Consider using custom event arguments by sub-classing System.EventArgs.
See, for example:
Using Events and Delegates in C#[^],
Events and event handling in C#[^].

—SA