WPF后台通知前台事件（ViewModelBase记录）

版本1：

定义：
public class ModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        public void RaisePropertyChanged(string propertyName)
        {
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
引用：
public class Person : ViewModelBase
    {
        private string _Name;
        /// <summary>
        /// 名字
        /// </summary>
        public string Name
        {
            get { return _Name; }
            set
            {
                _Name = value;
                RaisePropertyChanged("Name");
            }
        }
    }

版本2：

定义：
public class ViewModelBase : INotifyPropertyChanged
    {
        protected void RaisePropertyChanged<T>(Expression<Func<T>> action)
        {
            var propertyName = GetPropertyName(action);
            RaisePropertyChanged(propertyName);
        }

        private static string GetPropertyName<T>(Expression<Func<T>> action)
        {
            var expression = (MemberExpression)action.Body;
            var propertyName = expression.Member.Name;
            return propertyName;
        }

        public void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
    }
引用：
public class Person : ViewModelBase
    {
        private string _Name;
        /// <summary>
        /// 名字
        /// </summary>
        public string Name
        {
            get { return _Name; }
            set
            {
                _Name = value;
                RaisePropertyChanged(() => Name);
            }
        }
    }