ASP.NET MVC - 填充常用的下拉列表 [英] ASP.NET MVC - Populate Commonly Used Dropdownlists

问题描述

我想知道在 ASP.NET MVC 中填充常用下拉列表时的最佳实践是什么.例如，我有一个经常在我的应用程序中使用的国家和州选择.对于我想要包含这样一个下拉列表的每个视图，填充视图模型并从我的控制器绑定到该视图模型似乎很脏.

I was wondering what the best practice is when populating commonly used dropdownlists in ASP.NET MVC. For instance, I have a Country and State select which is used often in my application. It seems dirty to populate viewmodel and bind to that viewmodel from my controller for every single view I want to contain such a dropdownlist.

在这种情况下，人们如何填充下拉列表?- 自定义基类与此烘焙?辅助类等?

How do people populate their dropdownlists in such cases? - custom baseclass with this baked in? Helper classes, etc?

提前致谢，

日本

推荐答案

您可以使用 RequiresStateList 属性将通用功能注入到需要它的操作中.

You can have a RequiresStateList attribute to inject that common functionality to the actions that need it.

public class RequiresStateList : ActionFilterAttribute {
    public override void OnResultExecuting(ResultExecutingContext filterContext) 
    {
        filterContext.Controller.ViewData["StateList"] = GetStates();
    }
}

还有你的动作

[RequiresStateList]
public ActionResult Index() {
    return View();
}

现在您可以从视图中的 ViewData 中获取该列表.

Now you can get that list from the ViewData in your view.

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