RaisePropertyChanged <T>如何找到属性名称？

Question

这种方法有一个重载NotificationObject: -

protected void RaisePropertyChanged<T>(Expression<Func<T>> propertyExpression);

我们在以下方式写入属性的setter:

RaisePropertyChanged(() => PropertyVariable);

它是如何工作的？它如何从这个Lambda表达式中找到属性名称？

Answer 1

An Expression<TDelegate>表示lambda表达式的抽象语法树.所以你只需要分析这个语法树来找出属性名称:

protected void RaisePropertyChanged<T>(Expression<Func<T>> propertyExpression)
{
    var memberExpr = propertyExpression.Body as MemberExpression;
    if (memberExpr == null)
        throw new ArgumentException("propertyExpression should represent access to a member");
    string memberName = memberExpr.Member.Name;
    RaisePropertyChanged(memberName);
}