ThirdPartyAPI/ThirdPartyAPIs/CustomFilter/ValidationActionFilter.cs

using Common.Models.ModelValidation;
using Common.Models.RequestResponse;
using log4net;
using Newtonsoft.Json;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http.Controllers;
using System.Web.Http.Filters;

namespace ThirdPartyAPIs.CustomFilter
{
    public class ValidationActionFilter : ActionFilterAttribute
    {
        private readonly ILog _log = LogManager.GetLogger(typeof(ValidationActionFilter));

        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            var modelState = actionContext.ModelState;
            if (!modelState.IsValid)
            {
                TPResponse jsonResponse = new TPResponse();
                jsonResponse.ResponseCode = "104";
                jsonResponse.Msg = "Model Not Valid";
                List<FieldsValidation> modelList = new List<FieldsValidation>();
                foreach (var item in modelState.Keys)
                {
                    var err = modelState[item].Errors.ToList();
                    err.Select(x =>
                    {
                        var mes = (string.IsNullOrWhiteSpace(x.ErrorMessage) && string.IsNullOrEmpty(x.ErrorMessage) ? (!string.IsNullOrEmpty(x.Exception.Message) && !string.IsNullOrWhiteSpace(x.Exception.Message) ? x.Exception.Message : "") : x.ErrorMessage);
                        modelList.Add(new FieldsValidation() { Name = item.Split('.')[1], Message = mes });
                        return x;
                    }).ToList();
                }
                jsonResponse.Data = modelList;
                var a = JsonConvert.SerializeObject(jsonResponse);
                //var abc = actionContext.Request.CreateResponse(HttpStatusCode.BadRequest, jsonResponse);
                //actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.BadRequest, jsonResponse);
                //actionContext.Response = actionContext.Request
                //     .CreateErrorResponse(HttpStatusCode.BadRequest, a.ToString());
                _log.Info("Fields Are Not Valid Data:" + a);
                actionContext.Response = actionContext.Request.CreateErrorResponse(HttpStatusCode.InternalServerError, a.ToString());
            }
        }
    }
}