JW/EMIS.Web/Controls/Score/GradePointFormularDropdownList.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Html;
using Autofac;
using EMIS.CommonLogic.ScoreManage;
using EMIS.Utility;
using Bowin.Web.Controls.Mvc;
using Bowin.Common.JSON;
using System.Linq.Expressions;

namespace EMIS.Web.Controls.Score
{
    public static class GradePointFormularDropdownList
    {
        public static MvcHtmlString GradePointFormularListFor<TModel>(this HtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, Guid?>> expression, Expression<Func<TModel, bool>> isEnableExpression,
            DropdownListOptions dropdownListOptions = null,
            IDictionary<string, string> htmlAttributes = null)
        {
            List<string> htmlList = new List<string>();
            ModelMetadata modelMetadata = ModelMetadata.FromLambdaExpression<TModel, Guid?>(expression, htmlHelper.ViewData);
            ModelMetadata isEnableMetadata = ModelMetadata.FromLambdaExpression<TModel, bool>(isEnableExpression, htmlHelper.ViewData);
            string fullHtmlFieldName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression));
            var isEnable = (bool)(isEnableMetadata.Model ?? true);

            if (dropdownListOptions == null)
                dropdownListOptions = new DropdownListOptions();
            if (string.IsNullOrEmpty(dropdownListOptions.ID))
            {
                dropdownListOptions.ID = fullHtmlFieldName;
            }
            dropdownListOptions.Name = "combobox_" + fullHtmlFieldName;
            dropdownListOptions.BindType = DropdownListBindType.None;
            dropdownListOptions.OnSelect = "ScoreFormulaFunction.GradePointFormularChangeHidden";

            var validateAttributes = htmlHelper.GetUnobtrusiveValidationAttributes(fullHtmlFieldName, modelMetadata);
            if (htmlAttributes == null)
            {
                htmlAttributes = new Dictionary<string, string>();
            }
            validateAttributes.ToList().ForEach(x => htmlAttributes.Add(x.Key, x.Value.ToString()));

            using (var scope = AutofacHelper.Container.BeginLifetimeScope())
            {
                IGradePointFormulaServices gradePointFormulaServices = scope.Resolve<IGradePointFormulaServices>();
                var gradePointFormulaList = gradePointFormulaServices.GetGradePointFormulaList("");
                var selectedGradePointFormular = gradePointFormulaList.FirstOrDefault(x => x.GradePointFormulaID == (Guid)modelMetadata.Model);

                var list = gradePointFormulaList.Select(x => new DropdownListItem { Text = x.Name, Value = x.ToJson() }).ToList();

                dropdownListOptions.ItemList = list;
                if (selectedGradePointFormular != null)
                {
                    dropdownListOptions.SelectedValue = selectedGradePointFormular.ToJson();
                }
                dropdownListOptions.IsEnabled = isEnable;

                htmlList.Add(htmlHelper.DropdownList(dropdownListOptions, htmlAttributes).ToString());
            }
            htmlList.Add(htmlHelper.Hidden(fullHtmlFieldName, modelMetadata.Model, new { id = "hidden_" + fullHtmlFieldName }).ToString());

            return MvcHtmlString.Create(string.Join("", htmlList));
        }
    }
}