How to get part of model expression points to in strongly typed HtmlHelper extension

Question

ok say i have the following model:

public class bar{
    public string bar {get; set; }
}

public class foo{
    public bar mybar{get; set;}
    public string anotherproperty{get; set;}
}

And in the UI i want to do this:

@Html.MyWhackyHelperFor(x=>x.bar)

which uses :

public static MvcHtmlString MyWhackyHelperFor<TModel, TValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TValue>> expression){
//how can i get a the actual bar object here?
}

how do i get at the actual part of the model being refered to?

Answer 1

您需要将表达式编译为方法，然后调用该方法：

TValue val = expression.Compile()(htmlhelper.ViewData.Model);