Dotvvm run-time binding to 'object' type

Question

i have this class

public class Property{
     public string Name {get;set;}
     public object Value {get;set;} 
}

i want to create list of the above class List<Property> and dynamically add Mark Up Controls Code only , so as their website they have an example HERE and what i did to that example is adding a public property of type Property to the TextBoxWithLabel class and changed the setter of the above example for binding as follows:

    [MarkupOptions(AllowHardCodedValue = false)]
    public string Text
    {
        get { return (string)GetValue(TextProperty); }
        set {
            SetValue(TextProperty, value);
            Property.Value = value;
        }
    }
    public static readonly DotvvmProperty TextProperty
        = DotvvmProperty.Register<string, TextBoxWithLabel>(c => c.Text, "");

when i run the app and type something in the input field, the Value property of Type Property still null and here is where i'm stuck i tried also to debug setter and it turns out it does not reach there so there is problem with run-time binding, which is 'as their example' this line of code

textBox.SetBinding(TextBox.TextProperty, GetValueBinding(TextProperty));

any help will appreciated :)

EDIT:

for more clarification,i have page called MainAppPage and Markup Control with code behind called ContentControl simply , MainAppPage passes List<Property> to ContentControl using this in MainAppPage <controls:ContentControl Instance="{value: ClassObject}"/> then ContentControl start iterating through List<Property> and creating InputField's that derive from HtmlGenericControl

InputField's rendering like a charm in ContentControl only thing is not working is binding , so again, how to bind Property.Value to InputField.Text so any changes happens in UI from user reflects on Property.Value after the InputField gets unfocused like any other MVVM pattern ?

score 1 · Accepted Answer · answered Jun 19 '18 at 09:00

1

DotVVM does not assign to the property usning the setter, is sets the underlying property store in DotvvmBindableObject instead. It's very simmilar what WPF does with their DependencyProperty, it's needed to represent the data bindings. You can actually completely omit the C# property declaration, declaring the field TextProperty and calling the DotvvmProperty.Register is enough to declare a property for dotvvm.

Other "problem" is that the controls do not store any data, everything has to be persisted in the view model. You can only use the control properties to data-bind a view model property. I think we are running here into a XY problem, I can only tell why your code does not work, but I have no idea what are actually trying to do...

Anyway, if you just want to "bind" your control to a view model property, have a look at https://www.dotvvm.com/docs/tutorials/control-development-markup-controls-with-code/2.0. You can declare the property like that:

[MarkupOptions(AllowHardCodedValue = false)]
public string Text
{
    get { return (string)GetValue(TextProperty); }
    set { SetValue(TextProperty, value); }
}
public static readonly DotvvmProperty TextProperty
    = DotvvmProperty.Register<string, TextBoxWithLabel>(c => c.Text, "");

Use it in the markup of you control

@baseType FullName.Of.YourControl
{{value: _control.Text}}

And use the control in your page (or other control)

<cc:YourControl Text="{value: _this.Property.Value}" />

answered Jun 19 '18 at 09:00

exyi

452
3
12

for more clearfication i want to bind my Property.Value to TextProperty at runtime i can't simply use "" cuz it has to be in runtime so my question shortly:how can i bind Property.Value to any DotvvmProperty 'value'? – Al-Hanash Moataz Jun 19 '18 at 17:15
Why are you iterating in the code-behind class and not use something like `` – exyi Jun 21 '18 at 09:04
i did that , anyway something i noticed when i pass viewModel with data , the data is shown in UI but when i modfie data during runtime and debug the viewModel data does not change what i can tell is the binding is just in one direction ! from MainAppPage to UI is OK but from UI to MainAppPage Is Not OK ! could you help ? :) – Al-Hanash Moataz Jun 22 '18 at 02:04
I can only tell you, that this should work, if you have property access in the binding. – exyi Jun 22 '18 at 16:55
Simply , how to use Control code-only in a page with binding to viewmodel or any class property ? – Al-Hanash Moataz Jun 23 '18 at 14:37
Im still waiting sir – Al-Hanash Moataz Jun 26 '18 at 06:54

Dotvvm run-time binding to 'object' type

1 Answers1