How to add new custom field to All of the form controls

Question

1.00/5 (3 votes)

See more:

I want all my control to have new field so that I can use it in for loop.
I mean that I just want to add some meta and common data to that controls so that I can operate each control depending upon that meta data(without individually).

Like this

MyCustomType mct = new MyCustomType();
...
textBox1.MyCustomField=mct;

button1.MyCustomField=mct;
.
.


//on some event handler

for(int i =0; i<this.controls.count;i++){>
  MyCustomType mct=this.Controls[i].MyCustomField;
  if(mct.Status){
     this.Controls[i].Visible=false;
         ...
   }
}

Posted 7-Jul-11 23:34pm

whitehaker

Updated 8-Jul-11 17:23pm

thatraja

v5

Add a Solution

Comments

Prerak Patel 8-Jul-11 5:39am

Elaborate more.

Sergey Alexandrovich Kryukov 8-Jul-11 6:08am

You can be surprised, but this is about Reflection.Emit. See previous question by OP. I provides some answer.
--SA

OriginalGriff 8-Jul-11 5:55am

Sorry, but that doesn't tell us what you are trying to do. A "new field" of what type? How will you use it in a for loop?
Use the "Improve question" widget to edit your question and provide better information.

Sergey Alexandrovich Kryukov 8-Jul-11 6:08am

You can be surprised, but this is about Reflection.Emit. See previous question by OP. I provides some answer.
--SA

whitehaker 23-Jul-11 5:10am

Thanks alot.

2 solutions

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-07-08T00:06:00

Solution 1

Please see the answers to your previous question: How to allow My class to add custom fields and properties by other class on the fly[^].

Let me tell you that you have no idea what you're trying to do. The field would be untyped and very hard to use. I would like to see how you cope with the task.

Let's simplify. First step: make all your controls custom. Yes, do not inject anything. Create some interface(s) you may need for loops and have implement it (or them) in all control classes you want to participate in you loops. When you need to do those loops, obtain an interface reference from each control and use it.

Next step: To help with the next step, I want to know what do you want to do in those loops. I bet you don't need anything special. Please make sure you not just explain it in terms of "I want", but explain your ultimate goals.

—SA

Posted 8-Jul-11 0:06am

Sergey Alexandrovich Kryukov

Comments

OriginalGriff 8-Jul-11 6:16am

I see what you mean - I hadn't seen the earlier question. That is a very odd thing for what sounds like a newbie to want to do. I think he may well be trying to do something completely different...5!

Sergey Alexandrovich Kryukov 8-Jul-11 6:44am

Thank you, Griff.
I suspect this is just a fantasy, nothing serious. Let's see.
--SA

Espen Harlinn 8-Jul-11 6:46am

Good points, my 5

Sergey Alexandrovich Kryukov 8-Jul-11 6:47am

Thank you, Espen.
--SA

whitehaker 8-Jul-11 6:55am

I tried this way of creating custom controls, It's working to an extent.But I want it dynamically woking for all controls that implement Control Class.

Sergey Alexandrovich Kryukov 12-Jul-11 15:24pm

I say again and again: I suspect you don't need what you want. Your ultimate goal is not clear. Chances are, you don't need it. I already answered about dynamic technique. Use it to torture yourself :-)
--SA

whitehaker 18-Jul-11 0:47am

Thanks for your advice.

OriginalGriff · Accepted Answer · 2011-07-08T00:24:00

This may be a silly question, but you do realize that you don't have to do anything drastic, or even complex to add information to any control at run time (or design time, though run time is more flexible).

All controls have a Tag property, which you are free to use. It is an object reference, so you can put any type of value in it, as long as you cast it back when you want to use it. Since it is part of the Control, there is a different one available for each instance.

Won't that do for your app?

C#

Button b = new Button();
b.Tag = "b";
Controls.Add(b);
TextBox t = new TextBox();
t.Tag = new List<string>() { "Hello", "goodbye" };
Controls.Add(t);
...
foreach (Control c in Controls)
   {
   TextBox t = c as Textbox;
   if (t != null)
      {
      List<string> list = t.Tag as List<string>;
      ...
      }
   }

How to add new custom field to All of the form controls

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

How to add new custom field to All of the form controls

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

Existing Members

...or Join us