.net - RaisePropertyChanged 如何找到属性名称？

Question

NotificationObject 中此方法有一个重载:-

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

我们在属性的setter中这样写:

RaisePropertyChanged(() => PropertyVariable);

它是如何工作的？它如何从该 Lambda 表达式中找到属性名称？

Answer 1

安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);
}