nested User Control binding not working for nested property

Question

i have three usercontrol in a C# win application ; the main User is called UcReferenteTecnico that only contains UcContatto that has a nested usercontrol UcIndirizzo. UcContatto has a modelView named ContattoMV and UcIndirizzo has a modelview named IndirizzoMV

UcContatto modelview has a properies and a nested IndirizzoMV properties; they are done in this way:

public class ContattoMV:INotifyPropertyChanged
{

    string _NOME_CONTATTO;
    [HeaderAttribute("Nome contatto", true, 2)]
    public string NOME_CONTATTO
    {
        get { return _NOME_CONTATTO; }
        set
        {
            _NOME_CONTATTO = value;
            NotifyPropertyChanged("NOME_CONTATTO");
        }
    }
    public IndirizzoMV Indirizzo
    {
        get { return _Indirizzo; }
        set
        {
            _Indirizzo = value;
            NotifyPropertyChanged("Indirizzo");
        }
    }
    public void NotifyPropertyChanged(string aiPropertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(aiPropertyName));
        }
    }
}
public class IndirizzoMV:INotifyPropertyChanged
{
    public string TOPONIMO
    {
        get { return _TOPONIMO; }
        set
        {
            _TOPONIMO = value;
            NotifyPropertyChanged("TOPONIMO");
        }
    }
    public void NotifyPropertyChanged(string aiPropertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(aiPropertyName));
        }
    }
}

All properties are binding in UcContatto and in UcIndirizzo to Control in this way: In UcContatto:

this.txtNome.DataBindings.Add(new System.Windows.Forms.Binding("EditValue", this._bsContatto, "NOME_CONTATTO", true, System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged));

and to bind nested usercontrol UcIndirizzo do this:

this.ucIndirizzo1.DataBindings.Add(new System.Windows.Forms.Binding("BsIndirizzo", this._bsContatto, "Indirizzo", true));

where _bsContatto is typeof ContattoMV and BsIndirizzo is bindable properties done in this way:

[Bindable(true)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public IndirizzoMV BsIndirizzo
{
    get
    {
        return (IndirizzoMV)_bsIndirizzo.DataSource;
    }
    set
    {
        if (value == null)
        {
            return;
        }
        _bsIndirizzo.DataSource = value;
    }
}

In UcIndirizzo properites is binding in this way:

this.txtToponimo.DataBindings.Add(new System.Windows.Forms.Binding("EditValue", this._bsIndirizzo, "TOPONIMO", true, System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged));

where _bsIndirizzo is typeof IndirizzoMV. In UcContatto to spread properties to main UserControl i use another bindable properties in this way:

[Bindable(true)]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public ContattoMV BsContatto
{
    get
    {
        return (ContattoMV)_bsContatto.DataSource;
    }
    set
    {
        if (value == null)
        {
            return;
        }
        _bsContatto.DataSource = value;
    }
}

to initialize usercontrol in main Control UcReferenteTecnico i do this:

this.ucContatto1.BsContatto = new ContattoMV();

when i change value in my usercontrol if i set value in txtNome , NOME_CONTATTO properties is valued (enter in breakpoint put in set properties) if i change value in ucIndirizzo in txtToponimo no properties is valued

where is my error? thanks a lot

Answer 1

I'd say that your error is not using XAML to define your Binding s , but I guess that you might have some valid reason for that. I found it really difficult to follow your question because of all of the foreign type and property names, so while I don't think that I can help directly with your problem, I can provide this simple advice:

When you want to data bind to a property that is in a parent view model, you can simply use a RelativeSource Binding :

Imagine that this was in the parent view model:

public string NOME_CONTATTO
{
    get { return _NOME_CONTATTO; }
    set
    {
        _NOME_CONTATTO = value;
        NotifyPropertyChanged("NOME_CONTATTO");
    }
}

You could data bind to it directly from any child view like this:

<TextBox Text="{Binding DataContext.NOME_CONTATTO, 
    RelativeSource={RelativeSource AncestorType={x:Type Local:ParentView}}}" ... />

Alternatively, if you just want to pass some value between view models, you can use delegate s... see my answer to the How to call functions in a main view model from other view models? question to find out how to do that.