LIOT/Framework/Bowin.Web.Controls.Mvc/HtmlHelperExtensions/ComboGridExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using System.Linq.Expressions;

namespace Bowin.Web.Controls.Mvc
{
    public static class ComboGridExtensions
    {
        /// <summary>
        /// 下拉表格控件（下拉后显示数据表格），可带搜索，数据表格部分主要通过DataGrid控件实现
        /// </summary>
        /// <param name="htmlHelper"></param>
        /// <param name="comboGridOptions">下拉表格控件配置项</param>
        /// <param name="htmlAttributes">自定义Html属性扩展，用Dictionary的方式定义，例如：new Dictionary<string, string> { 
        ///     { "style", "width: 100%;" }, { "name", "ddlUsers" }
        /// }</param>
        /// <returns></returns>
        public static System.Web.Mvc.MvcHtmlString ComboGrid(
            this System.Web.Mvc.HtmlHelper htmlHelper
            , ComboGridOptions comboGridOptions
            , IDictionary<string, string> htmlAttributes = null)
        {
            if (comboGridOptions == null)
            {
                comboGridOptions = new ComboGridOptions();
            }

            if (string.IsNullOrEmpty(comboGridOptions.EmptyText))
            {
                comboGridOptions.EmptyText = "全部";
            }

            return MvcHtmlString.Create(Bowin.Web.Controls.Mvc.ComboGrid.CreateControl(comboGridOptions, htmlAttributes).Render());
        }

        /// <summary>
        /// 绑定ViewModel的下拉表格控件（下拉后显示数据表格），可带搜索，数据表格部分主要通过DataGrid控件实现
        /// </summary>
        /// <typeparam name="TModel"></typeparam>
        /// <typeparam name="TProperty"></typeparam>
        /// <param name="htmlHelper"></param>
        /// <param name="expression">定义绑定属性的lamda，如：(x => x.LoginID)</param>
        /// <param name="comboGridOptions">下拉表格控件配置项</param>
        /// <param name="htmlAttributes">自定义Html属性扩展，用Dictionary的方式定义，例如：new Dictionary<string, string> { 
        ///     { "style", "width: 100%;" }, { "name", "ddlUsers" }
        /// }</param>
        /// <returns></returns>
        public static MvcHtmlString ComboGridFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, TProperty>> expression,
            ComboGridOptions comboGridOptions,
            System.Collections.Generic.IDictionary<string, string> htmlAttributes = null)
        {
            if (expression == null)
            {
                throw new ArgumentNullException("expression");
            }
            ModelMetadata modelMetadata = ModelMetadata.FromLambdaExpression<TModel, TProperty>(expression, htmlHelper.ViewData);

            //获取值
            //modelMetadata.Model

            //获取字段名称，对应标签的name
            string fullHtmlFieldName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression));
            comboGridOptions.ID = fullHtmlFieldName;
            comboGridOptions.Name = fullHtmlFieldName;
            if (modelMetadata.Model != null)
            {
                comboGridOptions.SelectedValue = modelMetadata.Model;
            }

            //MVC验证支持
            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()));
            if (!string.IsNullOrEmpty(comboGridOptions.GridOptions.DataSourceUrl))
            {
                var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext);
                comboGridOptions.GridOptions.DataSourceUrl = urlHelper.Content(comboGridOptions.GridOptions.DataSourceUrl);
            }

            if (string.IsNullOrEmpty(comboGridOptions.EmptyText))
            {
                comboGridOptions.EmptyText = "请选择";
            }
            return MvcHtmlString.Create(Bowin.Web.Controls.Mvc.ComboGrid.CreateControl(comboGridOptions, htmlAttributes).Render());
        }

        /// <summary>
        /// 绑定ViewModel的下拉表格控件（下拉后显示数据表格），可带搜索，数据表格部分主要通过DataGrid控件实现（该重载主要用于少数特殊情况，建议尽量不要使用）
        /// </summary>
        /// <typeparam name="TModel"></typeparam>
        /// <typeparam name="TValueProperty"></typeparam>
        /// <param name="htmlHelper"></param>
        /// <param name="valueExpression">定义绑定属性的lamda，如：(x => x.LoginID)</param>
        /// <param name="textExpression">定义显示文本属性的lamda，如：(x => x.Name)</param>
        /// <param name="comboGridOptions">下拉表格控件配置项</param>
        /// <param name="htmlAttributes">自定义Html属性扩展，用Dictionary的方式定义，例如：new Dictionary<string, string> { 
        ///     { "style", "width: 100%;" }, { "name", "ddlUsers" }
        /// }</param>
        /// <returns></returns>
        public static MvcHtmlString ComboGridFor<TModel, TValueProperty>(this HtmlHelper<TModel> htmlHelper,
            Expression<Func<TModel, TValueProperty>> valueExpression,
            Expression<Func<TModel, string>> textExpression,
            ComboGridOptions comboGridOptions,
            IDictionary<string, string> htmlAttributes = null)
        {
            if (valueExpression == null)
            {
                throw new ArgumentNullException("valueExpression");
            }

            if (textExpression == null)
            {
                throw new ArgumentNullException("textExpression");
            }

            string fullHtmlFieldName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(valueExpression));
            comboGridOptions.ID = fullHtmlFieldName;
            comboGridOptions.Name = fullHtmlFieldName;

            ModelMetadata modelValueMetadata = ModelMetadata.FromLambdaExpression<TModel, TValueProperty>(valueExpression, htmlHelper.ViewData);

            if (modelValueMetadata.Model != null)
            {
                comboGridOptions.SelectedValue = modelValueMetadata.Model;
            }

            ModelMetadata modelTextMetadata = ModelMetadata.FromLambdaExpression<TModel, string>(textExpression, htmlHelper.ViewData);

            if (modelTextMetadata.Model != null)
            {
                comboGridOptions.SelectedText = (string)modelTextMetadata.Model;
            }

            //MVC验证支持
            var validateAttributes = htmlHelper.GetUnobtrusiveValidationAttributes(fullHtmlFieldName, modelValueMetadata);
            if (htmlAttributes == null)
            {
                htmlAttributes = new Dictionary<string, string>();
            }
            validateAttributes.ToList().ForEach(x => htmlAttributes.Add(x.Key, x.Value.ToString()));
            if (!string.IsNullOrEmpty(comboGridOptions.GridOptions.DataSourceUrl))
            {
                var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext);
                comboGridOptions.GridOptions.DataSourceUrl = urlHelper.Content(comboGridOptions.GridOptions.DataSourceUrl);
            }

            if (string.IsNullOrEmpty(comboGridOptions.EmptyText))
            {
                comboGridOptions.EmptyText = "请选择";
            }

            return MvcHtmlString.Create(Bowin.Web.Controls.Mvc.ComboGrid.CreateControl(comboGridOptions, htmlAttributes).Render());
        }
    }
}