BaseViewModel.cs

using System;
using System.ComponentModel;
using System.Linq.Expressions;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Input;

namespace Common.WPF
{
    public abstract class BaseViewModel : INotifyPropertyChanged
    {
        #region INotifyPropertyChanged Members and helper

        readonly NotifyPropertyChangedHelper _propertyChangeHelper = new NotifyPropertyChangedHelper();

        public event PropertyChangedEventHandler PropertyChanged
        {
            add { _propertyChangeHelper.Add(value); }
            remove { _propertyChangeHelper.Remove(value); }
        }

        protected void OnPropertyChanged(string propertyName)
        {
            _propertyChangeHelper.NotifyPropertyChanged(this, propertyName);
        }

        protected void OnPropertyChanged<T>(Expression<Func<T>> propertyExpression)
        {
            OnPropertyChanged(ExtractPropertyName(propertyExpression));
        }

        static string ExtractPropertyName<T>(Expression<Func<T>> propertyExpression)
        {
            if (propertyExpression == null)
                throw new ArgumentNullException(nameof(propertyExpression));
            var memberExpression = propertyExpression.Body as MemberExpression;
            if (memberExpression == null)
                throw new ArgumentException("The expression is not a member access expression.", nameof(propertyExpression));
            var property = memberExpression.Member as PropertyInfo;
            if (property == null)
                throw new ArgumentException("The member access expression does not access a property.", nameof(propertyExpression));
            return property.Name;
        }
        #endregion    
    }
}