注册区域过滤器 [英] Register filter for an area

问题描述

是否可以注册特定区域的过滤器?

Is there a way to register filter for specific area?

例如下面的代码在全局范围内注册授权过滤器(强制进行身份验证):

For example below code register Authorization Filter globally(force to authenticate):

services.AddMvc(config =>
{
    var policy = new AuthorizationPolicyBuilder()
                     .RequireAuthenticatedUser()
                     .Build();
    config.Filters.Add(new AuthorizeFilter(policy));
});

我想要这个，但只限于某些地区.

I want this but only for some areas.

推荐答案

您可以编写一个自定义的IFilterProvider，它可以动态创建过滤器.

You could write a custom IFilterProvider which can create the filter dynamically.

示例:

public class CustomFilterProvider : IFilterProvider
{
    public int Order
    {
        get
        {
            // This value is fine. The `DefaultFilterProvider` has an order of `-1000` and so is run before this provider.
            return 0;
        }
    }

    public void OnProvidersExecuted(FilterProviderContext context)
    {
    }

    public void OnProvidersExecuting(FilterProviderContext context)
    {
        var controllerActionDescriptor = context.ActionContext.ActionDescriptor as ControllerActionDescriptor;
        var controllerType = controllerActionDescriptor.ControllerTypeInfo;

        var areaAttribute = controllerType.GetCustomAttribute<AreaAttribute>();
        if(areaAttribute != null && areaAttribute.RouteValue == "Admin")
        {
            var filter = new TestAuthorizationFilter();
            context.Results.Add(new FilterItem(new FilterDescriptor(filter, FilterScope.Global), filter));
        }
    }
}

在DI中注册提供商:

services.TryAddEnumerable(ServiceDescriptor.Singleton<IFilterProvider, CustomFilterProvider>());

这篇关于注册区域过滤器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！