Question

我尝试在MVC中构建一个帮助器。我尝试传递这样的参数：

@Html.InputHandler(settings =>
{
    settings.Name = "Julio";
    settings.Mask = "000-000-000";
    settings.visible = false;
    settings.Label = true;
    settings.htmlAttributes = new { @class="form-control" }
})

我有以下代码来定义参数

public delegate void Action<in T>(T obj);

public class InputSettings : SettingsBase
{
    public string Name { get; set; }
    public bool Label { get; set; }
    public string Binding { get; set; }
    public bool visible { get; set; }
    public object htmlAttributes { get; set; }
    public string Mask { get; set; }
}

问题是我无法从助手传递值

public static MvcHtmlString InputHandler(this HtmlHelper htmlHelper, Action<InputSettings> method)
    {
        var parameters = method. ???        
        return new MvcHtmlString("");
    }

感谢的！

Answer 1

为了检索正文（因为当你试图检索它时它会被编译并且JIT被带到一个非常不同的状态），你需要一个CriteriaQuery<Tuple> cq = cb.createTupleQuery(); Root<Parent> root = cq.from(Parent.class); Join<Parent, Child1> child1Join = root.join("child1"); cq.select(cb.tuple(root.get("description"), child1Join.get("id"), cb.count(root.get("number"))); cq.groupBy(root.get("description"), child1Join.get("id")));。但是，您无法将lambda语句体转换为表达式树。因此，您可能最好将强类型对象作为Func传递并立即撤回结果。

Expression<Action<T>>

如何提取delegate参数传递的参数

1 个答案: