The attached Binding property does not work

Question

I created an attached property for a set of commands using inputbinding in a datagridRow or datagricell in the element style.

Here I am trying to add an inputBinding to things that are dynamically created, such as datagridrows / cells, so im trying to add an input binding in style.

Unfortunately, the style does not allow me to use the InputBindings property for datagridrows / cells in xaml, and it needs to be set in the code, so I need a nested property.

The bound property of a propertychangedcallback method is a trigger for each row / cell creation, and the method returns an object when the property is set and the value of the property. The value is a collection of input bindings. Elements are present in this collection, but the property of this element is not tied to their value.

In xaml, you can see that I only create one InputBinding for all rows / cells, but I need to copy this Inputbinding into each row because they need their own commandParameter parameter, otherwise the commandParameter parameter will be the same for each row / cell

When I remove InputBindingsCollection and use one InputBinding, it works, but I can only set input binding, and I want to have mouse binding and key binding, so I need to use InputBindingsCollection.

When I use InputBindingsCollection, inputBindings of the collection are not bound properly

In the method InputBindingsPropertyChangedCallBack inpuBind.Commandand inpuBind.CommandParameterare zeros instead of the binding value

AttacheCommand

public class AttacheCommand
{
    public static DependencyProperty InputBindingsProperty = DependencyProperty.RegisterAttached("InputBindings", 
                                                                                                 typeof(InputBindingCollection),
                                                                                                 typeof(AttacheCommand),
                                                                                                 new PropertyMetadata(InputBindingsPropertyChangedCallBack));
    public static void SetInputBindings(UIElement element, InputBindingCollection value)
    {
        element.SetValue(InputBindingsProperty, value);
    }

    public static InputBindingCollection GetInputBindings(UIElement element)
    {
        return (InputBindingCollection)element.GetValue(InputBindingsProperty);
    }

    public static void InputBindingsPropertyChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        UIElement element = d as UIElement;
        InputBinding copy;
        foreach (InputBinding inpuBind in e.NewValue as InputBindingCollection)
        {
           //*****Here is my problem inpuBind.Command and inpuBind.CommandParameter are not bind to their value and are null
            copy = new InputBinding(inpuBind.Command, inpuBind.Gesture);
            copy.CommandParameter = inpuBind.CommandParameter;

            element.InputBindings.Add(copy);
        }
    }
}

View:

<Window x:Class="UltimateCommand.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:UltimateCommand"
    Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
    <local:ViewModel x:Name="vm"/>
</Window.DataContext>
<Grid>
    <DataGrid ItemsSource="{Binding listModel1}" IsReadOnly="True">
        <DataGrid.RowStyle>
            <Style TargetType="{x:Type DataGridRow}">
                <Setter Property="local:AttacheCommand.InputBindings" >
                    <Setter.Value>
                        <InputBindingCollection>
                            <MouseBinding Command="{Binding ElementName=vm, Path=cmd1}" CommandParameter="{Binding}" Gesture="LeftClick"/>
                        </InputBindingCollection>
                    </Setter.Value>
                </Setter>
            </Style>
        </DataGrid.RowStyle>
    </DataGrid>
</Grid>
</Window>

ViewModel: (and command)

class ViewModel
{
    public Model1[] listModel1
    {
        get
        {
            return new Model1[] { new Model1("nom1", 1), new Model1("nom2", 2) };
        }
    }

    public Command1 cmd1
    {
        get
        {
            return new Command1();
        }
    }
}

public class Command1 : ICommand
{
    public bool CanExecute(object parameter)
    {
        //throw new NotImplementedException();
        return true;
    }

    public event EventHandler CanExecuteChanged;

    public void Execute(object parameter)
    {
        //throw new NotImplementedException();
    }
}

Model1:

public class Model1
{
    public string Nom { get; set; }
    public int Age { get; set; }

    public Model1(string n, int a)
    {
        Nom = n;
        Age = a;
    }
}

Answer 1

If I say it right, a nested property or Class command must be static

so you need to write a public static class AttachedCommand {}