[Original]. NET Web API filter ActionFilterAttribute filter, filterattribute

[Original]. NET Web API filter ActionFilterAttribute filter, filterattribute

1. Reference in the filter class, which is different from that in MVC.

using System.Web.Http.Controllers;using System.Web.Http.Filters;

2. The Code implemented in the filter class returns json

    public class FilterAttribute1 : ActionFilterAttribute    {        public override void OnActionExecuting(HttpActionContext filterContext)        {            var httpContext = (HttpContextWrapper)filterContext.Request.Properties["MS_HttpContext"];            string ID = httpContext.Request["ID"];            if (!string.IsNullOrEmpty(ID))            {                string jsonString = "{\"Status\":0,\"msg\":\"hello\"}";                HttpResponseMessage result =                    new HttpResponseMessage { Content = new StringContent(jsonString, Encoding.GetEncoding("UTF-8"), "application/json") };                filterContext.Response = result;            }            base.OnActionExecuting(filterContext);        }    }

3. Use the Action in the Controller, which is the same as MVC.

// GET api/values        [FilterAttribute1]        public IEnumerable<string> Get()        {            return new string[] { "value1", "value2" };        }