C＃在集中MVC重复可视数据 [英] C# Centralizing repeating VIewData in MVC

问题描述

当用户登录到我的应用程序，我想显示在整个应用他的名字。我使用asp.net MVC框架。但我不希望是必须把每个控制器是这样的：

When a user log in into my application i want to show his name throughout the whole application. I am using the asp.net MVC framework. But what i don't want is that is have to put in every controller something like:

ViewData["User"] = Session["User"];

这是因为你可能不重复自己。 （我相信这是DRY [不要重复自己]面向对象编程的原理。）
该计算机[用户]是我的母版。所以我的问题是，什么是处理在一个地方，我的计算机[用户]一种巧妙的方法？

This because you may not repeat yourself. (I believe this is the DRY [Don't Repeat Yourself] principle of OO programming.) The ViewData["User"] is on my masterpage. So my question is, what is a neat way to handle my ViewData["User"] on one place?

推荐答案

您可以在任何一个控制器基类，或者应用到控制器/动作的动作过滤器做到这一点很容易。在这两种情况下，你会得到之前（或之后）的动作确实触及请求的机会 - 让你可以在那里添加此功能

You can do this fairly easily in either a controller base-class, or an action-filter that is applied to the controllers/actions. In either case, you get the chance to touch the request before (or after) the action does - so you can add this functionality there.

例如：

public class UserInfoAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(
        ActionExecutingContext filterContext)
    {
        base.OnActionExecuting(filterContext);
        filterContext.Controller.ViewData["user"] = "Foo";
    }
}
...
[HandleError, UserInfo]
public class HomeController : Controller
{...}

（也可以在使用的动作的（方法）级）

---

或一个共同的基类：

public abstract class ControllerBase : Controller
{
    protected override void OnActionExecuting(
        ActionExecutingContext filterContext)
    {
        ViewData["user"] = "Bar";
        base.OnActionExecuting(filterContext);
    }
}

[HandleError]
public class HomeController : ControllerBase
{...}

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