ASP.NET Core 5 add action filter with parameter

Question

Trying to add an authentication filter to an ASP.NET Core 5 MVC action method and pass a parameter. However I'm unable to find a way to do this. This is the action filter code:

public class CheckUserPrivilege : IActionFilter
{
        private readonly IHttpContextAccessor _httpContextAccessor;
        private readonly ISession _session;
        public string PrivilegeCode { get; set; }

        public CheckUserPrivilledge(IHttpContextAccessor httpContextAccessor)
        {
            _httpContextAccessor = httpContextAccessor;
            _session = _httpContextAccessor.HttpContext.Session;
        }
}

The parameter we need to pass is PrivilegeCode. Ideally want something like [CheckUserPrivilege("abc")] but when we try like so, I presume it also asks for the IHttpContextAccessor` parameter in the constructor.

Any help appreciated.

Xinran Shen · Accepted Answer · 2021-12-20 08:35:43Z

5

You don't need to use IHttpContextAccessor to get parameter , You just need to use the following code :

public class CheckUserFilter : Attribute,IActionFilter
    {
        
        private readonly string PrivilegeCode;
        public CheckUserFilter(string _PrivilegeCode)
        {
            PrivilegeCode = _PrivilegeCode;
        }
        public void OnActionExecuted(ActionExecutedContext context)
        {
            //........
        }

        public void OnActionExecuting(ActionExecutingContext context)
        {
            //If you want to do somthing about context,
           // you just need to use`context.HttpContext.....`

            
        }
    }

when you try [CheckUserPrivilege("abc")] ,you can get the value in filter

answered Dec 20, 2021 at 8:35

Xinran Shen

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2 Comments

Abdul Ali Over a year ago

Thank you. seems to do the job

kipras Over a year ago

More details can be found here, which include Core2 Core3 and core6 pending

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