如何使 IRouteConstraint 过滤路由

问题描述

我编写了一个自定义路由约束，但它的过滤器无法识别.有人有使用 IRouteConstraint 的示例吗?

I wrote a custom route constraint, but its filter just doesn't get recognized. Does anyone have an example working use of IRouteConstraint ?

另外，请注意开发人员:我在我的 android 上获得了双重显示的表单.部分渲染一定有问题?

Also, note to developers: I get double display of the form on my android. Something must be wrong with the partial rendering?

推荐答案

这是一个在虚构存储库中查找文章 slug 的简单约束:

Here's a simple constraint that looks up an article slug in a fictional repository:

public class SlugRouteConstraint : IRouteConstraint
{
    private readonly ISlugRepository slugRepository = new SlugRepository();

    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        if (!values.ContainsKey(parameterName))
            return false;

        var slug = (string)values[parameterName];

        return slugRepository.Exists(slug);
    }
}

你可以像这样连接约束:

You could wire up the constraint like this:

routes.MapRoute("Slugs", "{slug}",
    new { controller = "Articles", action = "View" },
    new { slug = new SlugConstraint() });

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