iot/projects/Infrastructure/Web/AjaxSelectAttribute.cs

using Infrastructure.Web.Mvc;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;
using System.Linq;
using System.Reflection;

namespace System.ComponentModel.DataAnnotations
{
    public class AjaxSelectAttribute : UIHintAttribute, IClientModelValidator
    {
        protected string RouteName { get; set; }
        protected RouteValueDictionary RouteData { get; } = new RouteValueDictionary();
        public AjaxSelectAttribute(string action, string controller, string areaName = null) : base("AjaxSelect")
        {
            if (action != null)
            {
                RouteData["action"] = action;
            }
            if (controller != null)
            {
                RouteData["controller"] = controller;
            }
            if (controller != null)
            {
                RouteData["area"] = areaName;
            }
        }

        public void AddValidation(ClientModelValidationContext context)
        {
            var key = "data-ajax-url";
            var value = GetUrl(context);
            var attributes = context.Attributes;
            if (!attributes.ContainsKey(key))
            {
                attributes.Add(key, value);
            }
        }
        public string GetAjaxUrl(IUrlHelper url)
        {
            var scope = (url.ActionContext.ActionDescriptor as ControllerActionDescriptor)
                            .ControllerTypeInfo
                            .GetCustomAttribute<ControllerScopeAttribute>();
            var key = "range";
            if (scope != null && !RouteData.ContainsKey(key))
            {
                RouteData.Add(key, scope.Scope);
            }
            return url.RouteUrl(new UrlRouteContext
            {
                RouteName = RouteName,
                Values = RouteData
            });
        }
        private string GetUrl(ClientModelValidationContext context)
        {
            var scope = (context.ActionContext.ActionDescriptor as ControllerActionDescriptor)
                .ControllerTypeInfo
                .GetCustomAttribute<ControllerScopeAttribute>();
            var key = "range";
            if (scope != null && !RouteData.ContainsKey(key))
            {
                RouteData.Add(key, scope.Scope);
            }
            var url = context.ActionContext.HttpContext.RequestServices.GetRequiredService<IUrlHelperFactory>()
                .GetUrlHelper(context.ActionContext).RouteUrl(new UrlRouteContext
                {
                    RouteName = RouteName,
                    Values = RouteData
                });
            return url;
        }
    }
}