Snippets > C# > MVVM

MVVM base files examples

%projectRoot%/ViewModel/BaseViewModel.cs - CSharp


                            using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfApp1.ViewModel
{
    public class BaseViewModel
    {
        public event PropertyChangedEventHandler PropertyChanged;
        public virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

%projectRoot%/ViewModel/RelayCommand.cs - CSharp


                            using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace WpfApp1.ViewModel
{
    public class RelayCommand : ICommand
    {
        private Action&lt;object&gt; execute;
        private Func&lt;object, bool&gt; canExecute;

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }

        public RelayCommand(Action&lt;object&gt; execute, Func&lt;object, bool&gt; canExecute = null)
        {
            this.execute = execute;
            this.canExecute = canExecute;
        }

        public bool CanExecute(object parameter)
        {
            return this.canExecute == null || this.canExecute(parameter);
        }

        public void Execute(object parameter)
        {
            this.execute(parameter);
        }
    }
}