要在视图中使用的基本控制器中的属性

Question

我正在使用MVC 2.

我有一个每个Controller使用的BaseController类.在此基本控制器类中,有一个名为IsAdministrator的属性.我需要在我的视图的HTML部分中使用此方法.我该怎么做？

编辑:

我的BaseController中的属性定义如下:

public bool IsAdministratorUser
{
   get { return ... }
}

Answer 1

一种方法是使用HTML帮助器:

public static class HtmlExtensions
{
    public static bool IsAdministrator(this HtmlHelper htmlHelper)
    {
        var controller = htmlHelper.ViewContext.Controller as BaseController;
        if (controller == null)
        {
            throw new Exception("The controller used to render this view doesn't inherit from BaseContller");
        }
        return controller.IsAdministrator;
    }
}

在你看来:

<% if (Html.IsAdministrator()) { %>

<% } %>

更新:

@jfar关于MVC范式的评论是正确的.以下是您在实践中可以执行的操作.您可以定义所有视图模型派生自的基本视图模型类:

public class BaseViewModel
{
    public bool IsAdministrator { get; set; }
}

然后编写一个自定义操作过滤器属性,该属性将在操作后执行并设置属性:

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class AdministratorInjectorAttribute : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        base.OnActionExecuted(filterContext);
        var result = filterContext.Result as ViewResultBase;
        if (result != null)
        {
            // the action returned a strongly typed view and passed a model
            var model = result.ViewData.Model as BaseViewModel;
            if (model != null)
            {
                // the model derived from BaseViewModel
                var controller = filterContext.Controller as BaseController;
                if (controller != null)
                {
                    // The controller that executed this action derived
                    // from BaseController and posses the IsAdministrator property
                    // which is used to set the view model property
                    model.IsAdministrator = controller.IsAdministrator;
                }
            }
        }
    }
}

最后一部分是用这个属性装饰BaseController:

[AdministratorInjector]
public abstract class BaseController : Controller
{
    public bool IsAdministrator { get; set; }
}

最后,如果您的视图被强类型化为BaseViewModel可以直接使用该IsAdministrator属性的模型:

<% if (Model.IsAdministrator) { %>

<% } %>

可能比HTML助手多一些代码,但是你对尊重MVC范式的意识将会很清楚.