T＆GT; RaisePropertyChanged＆LT如何;发现属性名称？ [英] How RaisePropertyChanged<T> finds out the property name?

问题描述

目前这个方法的一个重载 NotificationObject ： -

There is one overload of this method in NotificationObject :-

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

我们写在财产的setter方法​​如下：

We write in the following way in the setter of property:

RaisePropertyChanged(() => PropertyVariable);

它是如何工作的？它是如何找到的属性名出这LAMBDA EX pression？

How does it works ? How it finds the property name out of this Lambda expression ?

推荐答案

这是防爆pression＆LT; TDelegate＆GT; 重presents的抽象语法树拉姆达EX pression。所以，你只需要分析这个语法树，找出属性名称：

An Expression<TDelegate> represents the abstract syntax tree of the lambda expression. So you just have to analyze this syntax tree to find out the property name:

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);
}

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