How to change the datagrid so that when it allows a placeholder new row to be available it has a hint in it as default. In this case <Enter New Record Here>. This uses FallbackValue.

Aim:

To create a button on a datagrid to delete a row but not crash on the new row placeholder row.

Method:

Add a column like any other inside the datagrid but use a template type to show the button.

                        
                            
                                
                                    
                                        
                                    
                                    Delete
                            
                        
                    

Add a converter to check for the new row place holder:

    [ValueConversion(typeof(string), typeof(Boolean))]
    public class PlaceHolderConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value.ToString() == "{DataGrid.NewItemPlaceholder}")
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new Exception();
        }
    }

Changing a new datagrid placeholders row style:

First Create a Delegate in ViewModel as a declaration:

public DelegateCommand Deploy { get; set; } 

Next create the method you are going to call:

//Deploy Module Clicked - This one takes ro_clientmodules_extend from my grid!
private void Deploy_click(ro_clientmodules_extend obj)
{

}

Next sort out the viewmodel constructor:

public LicenseDeploymentModuleViewModel()
{
   Deploy = new DelegateCommand(Deploy_click);
}

Finally deal with the XAML:

Note: Mine is inside the Datagrid as a button on a row. Yours may need adjusting to tweek the relative path!
Note2: Mine is also bound to an enable or disable variable.

Deploy

If you remove the references to ro_clientmodules_extend then you don’t need the complex additions to the binding although you will not then pass the variable back to the command procedure which could limit what you can do.. hence I left it in as an example.