Binding a property obtained from a method, that returns object-CodePudding

I have a problem with binding with a XAML file. There is a DataContext of Template class that has a GetDisplayParams() method. Method GetDisplayParams() returns an object of type TemplateDisplayParams, that has a Width property. I just need to bind TextBox to this property, but nothing works for me.

.xaml:

<TextBox Text="{Binding GetDisplayParams.Width}"/>

.axaml.cs:

public TemplateCompositeAttributesSettingsView(Scripting.Template dataContext) : this()
{
    DataContext = dataContext;
    Console.WriteLine( ((Scripting.Template)DataContext).GetDisplayParams().Width ); // return int.
}

Error:

CodePudding user response：

As @BionicCode said, in WPF and I think Avalonia in XAML can't bind to methods. Therefore, I had to create a TemplateCompositeAttributesSettingsViewModel and specify a public property there and later bind the DataContext TextBox to this ViewModel.

.xaml

<StackPanel Name="MinWidthMinHeightStackPanel" Margin="3.5" Orientation="Horizontal">
            <!--TODO-->
            <TextBox Text="{Binding MinWidth}"/> 
            <TextBlock Margin="20,0,20,0" Text="x" VerticalAlignment="Center"/>
            <!--TODO-->
            <TextBox Text="{Binding MinHeight}"/>
</StackPanel>

TemplateCompositeAttributesSettingsView.cs:

public TemplateCompositeAttributesSettingsView(Scripting.Template dataContext) : this()
{
    DataContext = dataContext;
    var templateCompositeAttributesSettingsViewModel = new TemplateCompositeAttributesSettingsViewModel( dataContext );
    this.FindControl<StackPanel>( "MinWidthMinHeightStackPanel" ).DataContext = templateCompositeAttributesSettingsViewModel;
}

TemplateCompositeAttributesSettingsViewModel.cs:

class TemplateCompositeAttributesSettingsViewModel : ViewModelBase
{
    public TemplateCompositeAttributesSettingsViewModel(Scripting.Template DataContext)
    {
        this.DataContext = DataContext;
    }

    public int MinWidth
    {
        get => DataContext.GetDisplayParams().Width;
    }

    public int MinHeight
    {
        get => DataContext.GetDisplayParams().Height;
    }

    public Scripting.Template DataContext { get; set; }
}

Output: enter image description here