有关带有void参数的LINQ表达式的问题 [英] Question about a LINQ expression with void parameter

问题描述

您好。我的问题是，这是否有区别：

Hi. My question is, is there a difference between this:

private ScreenMenuCategory _selectedCategory;
public ScreenMenuCategory SelectedCategory
{
     get { return _selectedCategory; }
     set { _selectedCategory = value; RaisePropertyChanged(() => SelectedCategory); }
}

这个？

and this?

private ScreenMenuCategory _selectedCategory;
public ScreenMenuCategory SelectedCategory
{
    get { return _selectedCategory; }
    set { _selectedCategory = value; RaisePropertyChanged(SelectedCategory); }
}

提前致谢。

Thanks in advance.

推荐答案

表达式< 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：

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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