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C# Language EditableAttribute (атрибут моделирования данных)


пример

EditableAttribute устанавливает, должны ли пользователи изменять значение свойства класса.

public class Employee
{
    [Editable(false)]
    public string FirstName { get; set; }
}

Простой пример использования в приложении XAML

<Window x:Class="WpfApplication.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:wpfApplication="clr-namespace:WpfApplication"
        Height="70" Width="360" Title="Display name example">

    <Window.Resources>
        <wpfApplication:EditableConverter x:Key="EditableConverter"/>
    </Window.Resources>

    <StackPanel Margin="5">
        <!-- TextBox Text (FirstName property value) -->
        <!-- TextBox IsEnabled (Editable attribute) -->
        <TextBox Text="{Binding Employee.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                 IsEnabled="{Binding Employee, Converter={StaticResource EditableConverter}, ConverterParameter=FirstName}"/>
    </StackPanel>
    
</Window>

namespace WpfApplication
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private Employee _employee = new Employee() { FirstName = "This is not editable"};

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }

        public Employee Employee
        {
            get { return _employee; }
            set { _employee = value; }
        }
    }
}

namespace WpfApplication
{
    public class EditableConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            // return editable attribute's value for given instance property,
            // defaults to true if not found
            var attribute = value.GetType()
                .GetProperty(parameter.ToString())
                .GetCustomAttributes(false)
                .OfType<EditableAttribute>()
                .FirstOrDefault();

            return attribute != null ? attribute.AllowEdit : true;
        }

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

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