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  • Filter execute order in asp.net web api

    https://stackoverflow.com/questions/21628467/order-of-execution-with-multiple-filters-in-web-api

    Some things to note here:

    1. Filters get executed in the following order for an action: Globally Defined Filters -> Controller-specific Filters -> Action-specific Filters.
    2. Authorization Filters -> Action Filters -> Exception Filters
    3. Now the problem that you seem to mention is related to having multiple filters of the same kind (ex: Multiple ActionFilterAttribute decorated on a controller or an action. This is the case which would not guarantee the order as its based on reflection.). For this case, there is a way to do it in Web API using custom implementation of System.Web.Http.Filters.IFilterProvider. I have tried the following and did some testing to verify it. It seems to work fine. You can give it a try and see if it works as you expected.  

    4. 如果有多个global action filters,这些filters的执行顺序按照config.Filters.Add的先后顺序来触发
    // Start clean by replacing with filter provider for global configuration.
    // For these globally added filters we need not do any ordering as filters are 
    // executed in the order they are added to the filter collection
    config.Services.Replace(typeof(IFilterProvider), new System.Web.Http.Filters.ConfigurationFilterProvider());
    
    // Custom action filter provider which does ordering
    config.Services.Add(typeof(IFilterProvider), new OrderedFilterProvider());
    public class OrderedFilterProvider : IFilterProvider
    {
        public IEnumerable<FilterInfo> GetFilters(HttpConfiguration configuration, HttpActionDescriptor actionDescriptor)
        {
            // controller-specific
            IEnumerable<FilterInfo> controllerSpecificFilters = OrderFilters(actionDescriptor.ControllerDescriptor.GetFilters(), FilterScope.Controller);
    
            // action-specific
            IEnumerable<FilterInfo> actionSpecificFilters = OrderFilters(actionDescriptor.GetFilters(), FilterScope.Action);
    
            return controllerSpecificFilters.Concat(actionSpecificFilters);
        }
    
        private IEnumerable<FilterInfo> OrderFilters(IEnumerable<IFilter> filters, FilterScope scope)
        {
            return filters.OfType<IOrderedFilter>()
                            .OrderBy(filter => filter.Order)
                            .Select(instance => new FilterInfo(instance, scope));
        }
    }
    //NOTE: Here I am creating base attributes which you would need to inherit from.
    public interface IOrderedFilter : IFilter
    {
        int Order { get; set; }
    }
    
    public class ActionFilterWithOrderAttribute : ActionFilterAttribute, IOrderedFilter
    {
        public int Order { get; set; }
    }
    
    public class AuthorizationFilterWithOrderAttribute : AuthorizationFilterAttribute, IOrderedFilter
    {
        public int Order { get; set; }
    }
    
    public class ExceptionFilterWithOrderAttribute : ExceptionFilterAttribute, IOrderedFilter
    {
        public int Order { get; set; }
    }
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  • 原文地址:https://www.cnblogs.com/chucklu/p/10441731.html
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