在 MVC、C# 中的每个请求中运行一个方法? [英] Run a method in each request in MVC, C#?

问题描述

在 WebForm 中，我们可以在 MasterPage.cs 中编写一个方法，它会在每个请求中运行.
例如:

In WebForm we could write a method in MasterPage.cs and it ran in each request .
e.g:

MasterPage.cs
--------------
protected void Page_Load(object sender, EventArgs e)
{
   CheckCookie();
}

我们如何在 MVC 中做这样的事情?

How can we do something like this in MVC ?

推荐答案

在 ASP.NET MVC 中，您可以编写一个 自定义全局操作过滤器.

In ASP.NET MVC you could write a custom global action filter.

更新:

根据评论部分的要求，这里有一个示例，说明此类过滤器的外观:

As requested in the comments section here's an example of how such filter might look like:

public class MyActionFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var fooCookie = filterContext.HttpContext.Request.Cookies["foo"];
        // TODO: do something with the foo cookie
    }
}

如果要根据cookie的值进行授权，实现IAuthorizationFilter 接口:

If you want to perform authorization based on the value of the cookie, it would be more correct to implement the IAuthorizationFilter interface:

public class MyActionFilterAttribute : FilterAttribute, IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        var fooCookie = filterContext.HttpContext.Request.Cookies["foo"];

        if (fooCookie == null || fooCookie.Value != "foo bar")
        {
            filterContext.Result = new HttpUnauthorizedResult();
        }
    }
}

如果您希望此操作过滤器在每个控制器操作的每个请求上运行，您可以在 RegisterGlobalFilters 方法中的 global.asax 中将其注册为全局操作过滤器:

If you want this action filter to run on each request for each controller action you could register it as a global action filter in your global.asax in the RegisterGlobalFilters method:

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    filters.Add(new HandleErrorAttribute());
    filters.Add(new MyActionFilterAttribute());
}

如果你只需要为特定的动作或控制器执行这个，只需用这个属性装饰它们:

And if you need this to execute only for particular actions or controllers simply decorate them with this attribute:

[MyActionFilter]
public ActionResult SomeAction()
{
    ...
}

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