C#•2y ago

❔ Winforms Property from BaseClass Form not getting transferred to derived Form

Hi. Don't know if you guys can help an amateur. I know most of you guys don't like winforms, but...

namespace MyApp.Common
{
    public partial class BaseForm : Form
    {
        private Guid _guid = Guid.NewGuid();
        public Guid GUID
        {
            get { return _guid; }
            set { _guid = value; }
        }

    }
}

namespace MyApp.Presentation
{
    public partial class Admin : BaseForm
    {

    }
}

namespace MyApp.Common
{
    public partial class BaseForm : Form
    {
        private Guid _guid = Guid.NewGuid();
        public Guid GUID
        {
            get { return _guid; }
            set { _guid = value; }
        }

    }
}

namespace MyApp.Presentation
{
    public partial class Admin : BaseForm
    {

    }
}

When I bring up the form "Admin" in designer view, it opens with a new Guid every time (obs using the base class Guid), unless I manually set Guid myself and then it adds it in Admin.Designer.cs.this.Guid="(whatever)" - this is missing until I manually add it. Is there any inheritance trick I can pull in the base class to force VS to create the this.Guid in Admin.Desginer.cs. Been messing around with this all day now! 🧱

25 Replies

RiA•2y ago

public static Guid GUID { get; private set; } = Guid.NewGuid(); You access it by: BaseForm.GUID everywhere.

stigzler•2y ago

The issue is VS auto generates the .Designer.cs

RiA•2y ago

you're adding the GUID property yourself though?

stigzler•2y ago

Thus, querying if there's any way to force it to generate .Guid in .Designer.cs in all instances, not just in the user entering it manually in Designer view no, I want it auto generated.

RiA•2y ago

if you need it to reflect on a form load just add the startup code somewhere in the Window.Loaded() equivalent event You want the same guid or each form to have different guids? each form instance i mean

stigzler•2y ago

I was hoping to do it all in the Base class sorry yes - different guids for different windows

RiA•2y ago

One easy way would be to add the event-compatible method to your base class. then definitely don't static anyway, continuing The only thing you'd have to do per form is

stigzler•2y ago

ok - thank you for your help

RiA•2y ago

Yeah you can add code to constructor i think did you check if the designer is resetting the constructor code?

stigzler•2y ago

The baseclass or .designer ctor?

RiA•2y ago

baseclass baseclass ctor functions should carry over afaik if not just add : base() to the derived class ctor and it should work

stigzler•2y ago

I think I did try setting Guid to new in base ctor, but will try again - 1 min again - no go as this is essentially the .designer.cs code - autogenerated

RiA•2y ago

the other way would be to add the GUID assignment to whatever creates your forms. yeah winforms is very convoluted and full of bad code practices.

stigzler•2y ago

I know, I know...

RiA•2y ago

How are you creating these forms?

stigzler•2y ago

Have you worked in winforms before?

RiA•2y ago

yes I mean to say are the forms being created by binding or you have a method to create them You can do this:

BaseForm myform = new();
myform.GUID = Guid.NewGuid();
myform.Show();

BaseForm myform = new();
myform.GUID = Guid.NewGuid();
myform.Show();

seems like the most relevant in your case. I dont want to be hacky with designer generated stuff either. you can have the guid assignment as a method in your base class but you'd still have to call that method after creating the form

stigzler•2y ago

Forgive me - I'm an amateur. Is there a way to specify code in the Base class and have this populate verbatim into the Derived class? Then I could just code (pseudo) [if guid is nothing then guid = guid.new] in the Form_Load auto populated method (Adding forms via "Add New" dialog! and then just updating inheritance to BaseForm from Form

RiA•2y ago

Wait so this guid assignment is during development or during runtime?

stigzler•2y ago

I'm wanting it during development

RiA•2y ago

You may have to look at source generators then. I'm not great at that stuff. you could add an attribute like [AutoGuid] to your class and then have a source generator generate that GUID property for you in a generated partial class fragment.

stigzler•2y ago

Oooo - now that sounds interesting

RiA•2y ago

Also, use incremental source generators (v2). the v1 are legacy The Community toolkit for mvvm works in a similar way. Take a look at [ObservableObject] or [ObservableProperty] source code for inspiration

stigzler•2y ago

Thanks Glitch - you've given me another starting point.

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Winforms Property from BaseClass Form not getting transferred to derived Form